# Patent

## Title
Semiconductor device, method of manufacturing the same, and signal transmitting/receiving method using the semiconductor device

## Abstract

A semiconductor device includes a semiconductor chip including a main surface, an internal circuit including a plurality of transistors, formed on the main surface, a bonding pad electrically connected to the internal circuit, formed on the main surface, an inductor for communicating an external device in a non-contact manner, formed on the main surface, and a seal ring formed along an outer peripheral edge of the semiconductor chip to surround the internal circuit and the bonding pad in a plan view. The inductor has a configuration to surround the internal circuit and the bonding pad in the plan view and along the seal ring. The inductor is arranged inside the seal ring.

## Background
The present application is a Continuation Application of U.S. patent application Ser. No. 13/137,074, filed on Jul. 19, 2011, which is a Continuation Application of U.S. patent application Ser. No. 12/292,820, filed on Nov. 26, 2008, which is based on and claims priority from Japanese patent application No. 2007-313821, filed on Dec. 4, 2007, the entire contents of which are incorporated herein by reference.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a semiconductor device, a method of manufacturing the same, and a signal transmitting/receiving method using the semiconductor device.
2. Description of Related Art
These days, a semiconductor device which communicates data by radio communication is known.
JP 2007-134694 A describes a semiconductor device which communicates data by electromagnetic induction. The semiconductor device includes a coiled antenna and a semiconductor integrated circuit connected to the coiled antenna. When the coiled antenna connected to a reader/writer is brought close to the semiconductor device, an AC magnetic filed is generated from the coiled antenna connected to the reader/writer. The generated AC magnetic field passes through the coiled antenna contained in the semiconductor device, and an electromotive force is generated between terminals of the coiled antenna by electromagnetic induction, whereby the semiconductor integrated circuit contained in the semiconductor device is operated.
JP 2005-311331 A describes a structure in which an integrated circuit and an antenna are formed on the same substrate, and conductor wires or conductive films forming the antenna are formed in two layers so as to sandwich the substrate including the integrated circuit formed thereon. In JP 2005-311331 A, there is described an example in which the conductor wire formed in one layer serves as an antenna for supplying power to the integrated circuit, and the conductor wire formed in another layer serves as an antenna for transmitting/receiving a signal.
JP 2005-228785 A describes a structure in which a coiled antenna is disposed outside the profile of a circuit of a semiconductor chip. Further, JP 2005-30877 A describes a technology of mounting a built-in test circuit and a radio communication circuit in a semiconductor integrated circuit device, and controlling the built-in test circuit by a radio signal to run a test.
The present inventor has recognized as follows. Conventionally, in order to run a test on an internal circuit of a semiconductor device at a wafer level, for example, a pad of a chip surface of the semiconductor device is subjected to probing using a probe to supply the internal circuit with power, or a signal is transmitted/received for observation thereof. There arises a problem in that, for example, damage is caused to the pad by the probe during a probe test, which later leads to a poor connection in the case of bonding the pad, or in that the pad is scraped and small pieces are removed, which causes contamination. Moreover, along with a reduction in chip size and an increase in pads per one chip, a pad size and a pitch between the pads have been reduced, and hence it has become increasingly difficult to realize a sufficient electrical connection through application of a number of probes corresponding to a number of pads.
In order to avoid the above-mentioned problem, it is desired that power be supplied to the internal circuit or the signal be transmitted/received to/from the internal circuit in a non-contact manner. However, in order to transmit/receive various signals to/from the internal circuit by, for example, electromagnetic induction instead of a plurality of pads to correspond to input/output signals to the plurality of pads, a large number of inductors are necessary, which increases an area required to provide those inductors. As described in JP 2007-134694 A, JP 2005-311331 A, and JP 2005-228785 A, with the structure in which the coiled antenna for transmitting/receiving a signal is arranged on a perimeter of the chip, a number of antennas cannot be arranged. Alternatively, in the technology described in JP 2005-30877 A, it is assumed that only one antenna coil is arranged for one chip, and power is generated using a carrier wave of a radio signal to be input from the outside. On the other hand, for supplying the internal circuit with power, large electromagnetic force is required.
SUMMARY
The present invention provides a semiconductor device, including:
a semiconductor substrate including a semiconductor chip formation region;
a chip internal circuit provided within the semiconductor chip formation region of the semiconductor substrate;
a signal transmitting/receiving unit which is provided within the semiconductor chip formation region of the semiconductor substrate, transmits/receives a signal to/from an outside in a non-contact manner by one of electromagnetic induction and capacitive coupling, and transmits/receives a signal to/from the chip internal circuit through electrical connection to the chip internal circuit; and
a power receiving inductor which has a diameter provided along an outer edge of the semiconductor chip formation region of the semiconductor substrate so as to surround the chip internal circuit and the signal transmitting/receiving unit, receives a power supply signal from the outside in the non-contact manner, and is electrically connected to the chip internal circuit.
The present invention also provides a signal transmitting/receiving method, including:
bringing an external device close to a semiconductor device in a non-contact manner,

    
    
        the semiconductor device including:
        
            a semiconductor substrate including a semiconductor chip formation region;
            a chip internal circuit provided within the semiconductor chip formation region of the semiconductor substrate;
            a signal transmitting/receiving unit which is provided within the semiconductor chip formation region of the semiconductor substrate, and transmits/receives a signal to/from the chip internal circuit through electrical connection to the chip internal circuit; and
            a power receiving inductor which has a diameter provided along an outer edge of the semiconductor chip formation region of the semiconductor substrate so as to surround the chip internal circuit and the signal transmitting/receiving unit, and is electrically connected to the chip internal circuit,
        
        
        the external device including:
        
            a power supply inductor corresponding to the power receiving inductor; and
            an external signal transmitting/receiving unit which transmits/receives a signal to/from the signal transmitting/receiving unit in the non-contact manner by one of electromagnetic induction and capacitive coupling; and
        
        
    
    


transmitting/receiving the signal between the external signal transmitting/receiving unit and the signal transmitting/receiving unit, and transmitting/receiving a power supply signal between the power supply inductor and the power receiving inductor.
With the structure described above, the signal transmitting/receiving unit can be formed to be smaller than the power receiving inductor to be provided inside the power receiving inductor, with the result that an increase in chip size can be limited even when a plurality of the signal transmitting/receiving units are arranged. On the other hand, a diameter of the power receiving inductor can be increased, and hence a signal large enough to supply a power supply voltage can be obtained.
The present invention also provides a method of manufacturing a semiconductor device, including:
bringing an external device close to a semiconductor device in a non-contact manner,
the semiconductor device including:

    
    
        a semiconductor substrate including a semiconductor chip formation region and a scribe line region provided around the semiconductor chip formation region;
        a chip internal circuit provided within the semiconductor chip formation region of the semiconductor substrate;
        a signal transmitting/receiving unit which is provided within the semiconductor chip formation region of the semiconductor substrate and transmits/receives a signal to/from the chip internal circuit through electrical connection to the chip internal circuit;
        a power receiving inductor which has a diameter provided along an outer edge of the semiconductor chip formation region of the semiconductor substrate so as to surround the chip internal circuit and the signal transmitting/receiving unit, and is electrically connected to the chip internal circuit;
        a bonding pad which is provided in the semiconductor chip formation region of the semiconductor substrate correspondingly to the signal transmitting/receiving unit and is electrically connected to the chip internal circuit; and
        a power supply bonding pad provided in the semiconductor chip formation region of the semiconductor substrate while being electrically connected to the chip internal circuit,
    
    


the external device including:

    
    
        a power supply inductor corresponding to the power receiving inductor; and
        an external signal transmitting/receiving unit which transmits/receives a signal to/from the signal transmitting/receiving unit in the non-contact manner by one of electromagnetic induction and capacitive coupling;
    
    


transmitting/receiving the signal between the external signal transmitting/receiving unit and the signal transmitting/receiving unit;
transmitting/receiving a power supply signal between the power supply inductor and the power receiving inductor;
cutting the semiconductor device along the scribe line region into chips; and
connecting, in each of the chips of the semiconductor device, the bonding pad and the power supply bonding pad to the external signal transmitting/receiving unit and an external power supply circuit through a bonding wire, respectively.
With the structure described above, before the semiconductor substrate is cut into chips, the signal is transmitted/received in the non-contact manner, and at the same time, a power supply voltage can be supplied in the non-contact manner when a test is run at a wafer level.
It should be noted that a semiconductor device or a method in which the above-mentioned components are appropriately combined or a description of the present invention is changed therebetween is also effective as an aspect of the present invention.
According to the present invention, the power supply can be made sufficiently in the non-contact manner while limiting an increase in chip size when various signals are transmitted/received in the non-contact manner.



BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, advantages and features of the present invention will be more apparent from the following description of certain preferred embodiments taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a plan view illustrating a structure of a semiconductor device according to an embodiment of the present invention;
FIG. 2 is a plan view illustrating a structure of a semiconductor chip formation region and a structure of a scribe line region provided around semiconductor chip formation region in detail;
FIG. 3 is a cross-sectional view taken along a line A-A′ of FIG. 2; and
FIG. 4 is a block diagram illustrating the structure of the semiconductor device and a structure of a tester.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Hereinafter, an embodiment of the present invention is described with reference to the drawings. It should be noted that similar components are denoted by similar reference numerals in the respective drawings, and their descriptions are appropriately omitted. In this embodiment, a description is given of a case where, as an example, when a test is run on a chip internal circuit provided within a semiconductor device at a wafer level, various test signals are transmitted/received to/from an external tester in a non-contact manner, and at the same time, the semiconductor device is supplied with a power supply voltage in the non-contact manner.
FIG. 1 is a plan view illustrating a structure of a semiconductor device 100 according to this embodiment.
The semiconductor device 100 includes a semiconductor substrate 101. A plurality of semiconductor chip formation regions 102 and a scribe line region 104 provided around the semiconductor chip formation regions 102 are formed on a surface of the semiconductor substrate 101. FIG. 1 illustrates four semiconductor chip formation regions 102, and an alignment mark 108 is provided thereamong in the scribe line region 104.
FIG. 2 is a plan view illustrating a structure of one semiconductor chip formation region 102 and a structure of the scribe line region 104 provided around the semiconductor chip formation region 102 in detail.
The semiconductor device 100 includes a chip internal circuit 124, a plurality of signal transmitting/receiving inductors 114 (signal transmitting/receiving units), a plurality of bonding pads 118, a plurality of conversion circuits 116, a power supply circuit 120, and a bonding pad 122, which are each provided within the semiconductor chip formation region 102. The bonding pad 118 and the bonding pad 122 are pads to be later subjected to wire bonding.
In a conventional semiconductor device, the signal transmitting/receiving inductor 114 can be provided in place of a pad which is provided for probing the internal circuit using a probe at a wafer level. Conventionally, when probing is performed using the probe, pad is damaged, and when bonding is performed in the damaged portion, the bonding may cause a poor connection. Therefore, a probing region and a wire-bonding region need to be provided for the pad, and thus the size thereof is increased. In this embodiment, the bonding pad 118 needs to include only the wire-bonding region, whereby the size thereof can be reduced compared with the conventional pad.
It should be noted that the signal transmitting/receiving inductor 114 is provided in the vicinity of a surface of the semiconductor device 100 so as to transmit/receive a signal to/from the external device. In addition, the bonding pad 118 is provided in the vicinity of the surface of the semiconductor device 100 so as to be later subjected to wire bonding. On the other hand, the conversion circuit 116 does not need to be provided in the vicinity of the surface of the semiconductor device 100 because the conversion circuit 116 just converts the signal transmitted/received to/from the external device by the signal transmitting/receiving inductor 114. Therefore, the conversion circuit 116 can be provided so as to overlap the signal transmitting/receiving inductor 114 in a laminating direction of the semiconductor substrate, with the result that an increase in size of the semiconductor device 100 can be limited.
The conversion circuits 116 are each provided under the signal transmitting/receiving inductors 114 correspondingly to the respective signal transmitting/receiving inductors 114. The each signal transmitting/receiving inductor 114 is electrically connected to the chip internal circuit 124 through the corresponding conversion circuit 116. The conversion circuit 116 modulates/demodulates the signal transmitted/received between the chip internal circuit 124 and the outside. Moreover, the each bonding pad 118 is electrically connected to the chip internal circuit 124.
Further, the semiconductor device 100 includes a seal ring 110 provided on a perimeter portion of the each semiconductor chip formation region 102 and a power receiving inductor 112 provided around the seal ring 110. The power receiving inductor 112 has a diameter provided along an outer edge of the each semiconductor chip formation region 102 so as to surround the plurality of signal transmitting/receiving inductors 114 and the plurality of bonding pads 118. The power receiving inductor 112 has one end and another end, which are connected to the power supply circuit 120. The power supply circuit 120 is, for example, a rectifier circuit. The power receiving inductor 112 is connected to the chip internal circuit 124 through the power supply circuit 120. The signal transmitting/receiving inductor 114 and the power receiving inductor 112 can be formed in a coil shape.
The bonding pad 122 is electrically connected to the chip internal circuit 124. The bonding pad 122 is connected to a power supply circuit outside the chip through a bonding wire after the semiconductor device 100 is cut along the scribe line region 104 into chips. Then, power is supplied to the chip internal circuit 124 through the bonding pad 122 from the power supply circuit outside the chip. It should be noted that the bonding pad 122 can also be formed in a smaller size compared with the conventional pad, because it is sufficient that the bonding pad 122 includes only the wire-bonding region.
FIG. 3 is a cross-sectional view taken along a line A-A′ of FIG. 2. Here, a structure of a tester 200 which supplies the semiconductor device 100 with a signal is also illustrated.
The semiconductor device 100 includes the signal transmitting/receiving inductors 114, the seal ring 110, and the power receiving inductor 112 within an insulating layer 103 provided on the semiconductor substrate 101. The tester 200 includes a plurality of signal transmitting/receiving inductors 204 provided at positions corresponding to the signal transmitting/receiving inductors 114 provided within the semiconductor chip formation region 102 of the semiconductor device 100 and a power supply inductor 202 provided correspondingly to the power receiving inductor 112 of the semiconductor device 100.
FIG. 4 is a block diagram illustrating the structure of the semiconductor device 100 and the structure of the tester 200.
The chip internal circuit 124 can include a plurality of transistors 126 corresponding to the plurality of signal transmitting/receiving inductors 114. One end of a source and a drain of the each transistor 126 is grounded, and another end thereof is connected to the power supply circuit 120 or the bonding pad 122 through a power supply line 128. In this case, a back surface of the semiconductor substrate 101 can be grounded so that one end of the transistor 126 is connected to the back surface of the semiconductor substrate 101 to be grounded. Besides, gates of the transistors 126 are each connected to the signal transmitting/receiving inductors 114 through the conversion circuits 116. Further, the gates of the transistors 126 are each also connected to the bonding pads 118. It should be noted that an input/output buffer circuit may be inserted between the transistor 126 and the bonding pad 118 or between the transistor 126 and the conversion circuit 116, which is not illustrated in FIG. 4.
Next, an operation when the semiconductor device 100 according to this embodiment receives a signal from the tester 200 is described with reference to FIG. 2 to FIG. 4.
First, the tester 200 is brought close to any chip of the semiconductor device 100 so that the signal transmitting/receiving inductor 204 and the power supply inductor 202 of the tester 200 are opposed to the signal transmitting/receiving inductor 114 and the power receiving inductor 112 of the semiconductor device 100, respectively. Then, the signal transmitting/receiving inductor 204 and the power supply inductor 202 of the tester 200 output, to the semiconductor device 100, radiowaves each having a predetermined frequency. In this case, a test signal and a power supply signal are output from the signal transmitting/receiving inductor 204 and the power supply inductor 202, respectively.
The power receiving inductor 112 of the semiconductor device 100 converts the signal output from the power supply inductor 202 into an AC electrical signal. The power supply circuit 120 generates a power supply voltage based on the AC electrical signal converted by the power receiving inductor 112 and supplies the generated power supply voltage to the chip internal circuit 124. The signal transmitting/receiving inductor 114 of the semiconductor device 100 converts the signal output from the signal transmitting/receiving inductor 204 into an AC electrical signal. The conversion circuit 116 demodulates the AC electrical signal converted by the signal transmitting/receiving inductor 114 and supplies the demodulated AC electrical signal to the chip internal circuit 124. When a signal is output from the semiconductor device 100 to the tester 200, the conversion circuit 116 modulates the electrical signal supplied from the chip internal circuit 124 and supplies the modulated electrical signal to the signal transmitting/receiving inductor 114. The signal transmitting/receiving inductor 114 outputs the modulated electrical signal as a radio wave to the corresponding signal transmitting/receiving inductor 204 of the tester 200. Accordingly, data is transmitted/received and power is supplied between the semiconductor device 100 and the tester 200.
In this embodiment, the diameter of the power receiving inductor 112 can be increased, whereby a signal large enough to supply the power supply voltage can be obtained. Moreover, the signal transmitting/receiving inductor 114 is formed to be smaller than the power receiving inductor 112 so that the signal transmitting/receiving inductor 114 is included within the power receiving inductor 112, and thus an increase in size thereof can be limited even if a plurality of signal transmitting/receiving units are provided.
Further, in this embodiment, the power receiving inductor 112 is provided around the seal ring 110, and hence the power receiving inductor 112 can be caused to function as a chipping stop layer when wafer dicing is performed along the scribe line region 104. In addition, the power receiving inductor 112 can be used as a chipping sensor for detecting an occurrence of chipping in the semiconductor chip.
The embodiment of the present invention has been described with reference to the drawings, which is an example of the present invention, and various structures other than the above-mentioned structure can also be adopted.
In the embodiment described above, the case where the signal transmitting/receiving unit serves as an inductor has been described as an example. However, the signal transmitting/receiving unit may serve as a capacitor, and data may be transmitted/received to/from an external device such as the tester 200 by capacitive coupling.
Further, in the embodiment described above, the description has been made of the case where various test signals are transmitted/received in a non-contact manner to/from the external tester when a test is run on the chip internal circuit of the semiconductor device at the wafer level. However, the present invention can also be applied to a case where various signals are transmitted/received in the non-contact manner after the semiconductor substrate is cut into chips. Moreover, the power receiving inductor 112 may be provided within the seal ring 110.
It is apparent that the present invention is not limited to the above embodiments, but may be modified and changed without departing from the scope and spirit of the invention.

## Claims

1. A semiconductor device, comprising:
a semiconductor chip comprising a main surface;
an internal circuit including a plurality of transistors, formed on said main surface;
a bonding pad electrically connected to said internal circuit, formed on said main surface;
an inductor for communicating an external device in a non-contact manner, formed on said main surface;
a seal ring formed along an outer peripheral edge of said semiconductor chip to surround said internal circuit and said bonding pad in a plan view,
wherein said inductor has a configuration to surround said internal circuit and said bonding pad in the plan view and along said seal ring, and
wherein said inductor is arranged outside said seal ring;

a signal transmitter which transmits a signal to an outside of the semiconductor device, and transmits another signal to the internal circuit through a wire that extends from the signal transmitter to the internal circuit to electrically connect the signal transmitter to the internal circuit; and
a substrate including a semiconductor chip formation region,
wherein the internal circuit is provided within the semiconductor chip formation region of the substrate,
wherein the signal transmitter is provided within the semiconductor chip formation region of the semiconductor substrate,
wherein the inductor comprises a power receiving inductor provided along an outer edge of the semiconductor chip formation region of the substrate to surround the internal circuit and the signal transmitter,
wherein the signal transmitter comprises a plurality of signal transmitting/receiving inductors, and
wherein the plurality of transistors correspond to the plurality of signal transmitting/receiving inductors.

2. The semiconductor device according to claim 1, further comprising:
a conversion circuit which is provided in the semiconductor chip formation region of the substrate,
wherein gates of the transistors are connected to the signal transmitting/receiving inductors through the conversion circuit.

3. The semiconductor device according to claim 2, wherein the conversion circuit demodulates an electrical signal converted by the signal transmitter, and supplies the demodulated electrical signal to the internal circuit.

4. The semiconductor device according to claim 3, wherein the conversion circuit modulates the electrical signal that is supplied from the internal circuit, and supplies the modulated electrical signal to the signal transmitter.

5. The semiconductor device according to claim 4, wherein the signal transmitter outputs the modulated electrical signal as a radio wave to a corresponding one of the signal transmitting/receiving inductors placed in said outside.

6. The semiconductor device according to claim 1, further comprising:
a power supply circuit, said inductor being connected to said internal circuit through said power supply circuit.

7. The semiconductor device according to claim 1, wherein said inductor is electrically connected to an input of circuit of said internal circuit, and
wherein said bonding pad is electrically connected to an output circuit of said internal circuit.

8. The semiconductor device according to claim 1, wherein the inductor is disposed in an outermost area of the semiconductor chip.

9. The semiconductor device according to claim 1, wherein the signal transmitter transmits the signal to the outside by one of an electromagnetic induction and a capacitive coupling.

10. The semiconductor device according to claim 1, wherein the inductor receives a power supply signal from the external device, and is electrically connected to the internal circuit.

11. The semiconductor device according to claim 10, wherein said signal transmitter transmits said signal to the outside independent of the inductor.