Source: http://www.google.com/patents/US20060205374?dq=5,870,513
Timestamp: 2015-10-10 00:09:39
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Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60']

Patent US20060205374 - Adaptive radio transceiver with a local oscillator - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including...http://www.google.com/patents/US20060205374?utm_source=gb-gplus-sharePatent US20060205374 - Adaptive radio transceiver with a local oscillatorAdvanced Patent SearchPublication numberUS20060205374 A1Publication typeApplicationApplication numberUS 11/340,038Publication dateSep 14, 2006Filing dateJan 26, 2006Priority dateOct 21, 1999Also published asUS6404293, US6417737, US6608527, US7031668, US7555263, US7720444, US7970358, US8041294, US20030042984, US20030067359, US20090286487, US20100295598Publication number11340038, 340038, US 2006/0205374 A1, US 2006/205374 A1, US 20060205374 A1, US 20060205374A1, US 2006205374 A1, US 2006205374A1, US-A1-20060205374, US-A1-2006205374, US2006/0205374A1, US2006/205374A1, US20060205374 A1, US20060205374A1, US2006205374 A1, US2006205374A1InventorsHooman Darabi, Ahmadreza Rofougaran, Maryam RofougaranOriginal AssigneeHooman Darabi, Ahmadreza Rofougaran, Maryam RofougaranExport CitationBiBTeX, EndNote, RefManPatent Citations (32), Referenced by (9), Classifications (25), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetAdaptive radio transceiver with a local oscillator
US 20060205374 A1Abstract
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims. Images(33) Claims(27)
1-53. (canceled) 54. A wireless communications device, comprising: a local oscillator comprising: an oscillator configured to generate a first signal having a first frequency, a frequency divider configured to generate a second signal from the first signal, the second signal having a second frequency, and a first mixer configured to mix the first signal and the second signal to produce a third signal having a third frequency; and a transmitter having a second mixer configured to mix the third signal and a fourth signal. 55. The wireless communications device according to claim 54, wherein the oscillator, the frequency divider, the first mixer and the second mixer are each quadrature. 56. The wireless communications device according to claim 54, wherein the third frequency comprises a sum of the first frequency and the second frequency. 57. The wireless communications device according to claim 54, wherein the fourth signal comprises a baseband signal. 58. The wireless communications device according to claim 54, wherein the frequency divider is programmable. 59. The wireless communications device according to claim 54, wherein the oscillator comprises a voltage controlled oscillator. 60. The wireless communications device according to claim 59, wherein the local oscillator comprises a phase locked loop configured to control the first frequency of the first signal generated by the voltage controlled oscillator. 61. The wireless communications device according to claim 60, wherein the local oscillator comprises a second oscillator and a second frequency divider, wherein the second frequency divider is operatively coupled to the second oscillator, and wherein the voltage controlled oscillator is phase locked to an output of the second frequency divider. 62. The wireless communications device according to claim 61, wherein the second frequency divider comprises a programmable divisor input. 63. The wireless communications device according to claim 62, further comprising: a receiver having a third mixer configured to mix the third signal and a fifth signal with a first control signal applied to the programmable divisor input, wherein the third signal and the fourth signal are mixed by the second mixer with a second control signal applied to the programmable divisor input, and wherein the second control signal is different from the first control signal. 64. The wireless communications device according to claim 54, wherein the wireless communications device performs orthogonal frequency division multiplexing. 65. The wireless communications device according to claim 54, wherein the wireless communications device performs spread spectrum modulation. 66. The wireless communications device according to claim 54, wherein the wireless communications device performs frequency hopping. 67. The wireless communications device according to claim 54, wherein the wireless communications device performs direct sequence spread spectrum modulation. 68. The wireless communications device according to claim 54, wherein the local oscillator and the transmitter are integrated on a single integrated circuit chip. 69. The wireless communications device according to claim 54, wherein the local oscillator or the transmitter is integrated on an integrated circuit chip. 70. The wireless communications device according to claim 54, wherein the local oscillator employs CMOS technology. 71. The wireless communications device according to claim 54, wherein the transmitter employs CMOS technology. 72. The wireless communications device according to claim 54, wherein the transmitter and the local oscillator employ CMOS technology. 73. The wireless communications device according to claim 54, wherein the wireless communications device can be programmed to support a plurality of different wireless spread spectrum modulation techniques. 74. The wireless communications device according to claim 54, wherein the wireless communications device supports a plurality of different wireless spread spectrum modulation techniques. 75. The wireless communications device according to claim 54, wherein the wireless communications device supports wireless communications using orthogonal frequency division multiplexing and wireless communications using spread spectrum modulation. 76. The wireless communications device according to claim 54, wherein the wireless communications device supports wireless communications using orthogonal frequency division multiplexing and wireless communications using direct sequence spread spectrum modulation. 77. The wireless communications device according to claim 54, wherein the wireless communications device supports wireless communications using orthogonal frequency division multiplexing and wireless communications using frequency hopping. 78. The wireless communications device according to claim 54, wherein the wireless communications device supports wireless communications using orthogonal frequency division multiplexing, wireless communications using frequency hopping and wireless communications using direct sequence spread spectrum modulation. 79. A wireless spread spectrum communications device, comprising: a local oscillator comprising: a quadrature oscillator that generates a first signal having a first frequency, a quadrature frequency divider that generates a second signal from the first signal, the second signal having a second frequency, and a first quadrature mixer that mixes the first signal and the second signal and produces a third signal having a third frequency; and a transmitter having a second quadrature mixer, the second quadrature mixer mixing the third signal with a fourth signal. Description
CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of co-pending application Ser. No. 10/165,464, filed Jun. 7, 2002, which is a continuation of application Ser. No. 09/691,633, filed Oct. 18, 2000, now issued U.S. Pat. No. 6,404,293 B1, which is a continuation of co-pending application Ser. No. 09/634,552, filed Aug. 8, 2000, which claims priority to and benefit from provisional Application No. 60/160,806, filed Oct. 21, 1999; Application No. 60/163,487, filed Nov. 4, 1999; Application 60/163,398, filed Nov. 4, 1999; Application No. 60/164,442, filed Nov. 9, 1999, Application No. 60/164,194, filed Nov. 9, 1999; Application No. 60/164,314, filed Nov. 9, 1999; Application No. 60/165,234, filed Nov. 11, 1999; Application No. 60/165,239, filed Nov. 11, 1999; Application No. 60/165,356, filed Nov. 12, 1999; Application No. 60/165,355, filed Nov. 12, 1999; Application No. 60/172,348, filed Dec. 16, 1999; Application No. 60/201,335, filed May 2, 2000; Application No. 60/201,157, filed May 2, 2000; Application No. 60/201,179, filed May 2, 2000; Application No. 60/202,997, filed May 10, 2000; and Application No. 60/201,330, filed May 2, 2000. The above-identified applications are hereby incorporated herein by reference in their entirety. This application is also a continuation of co-pending application Ser. No. 09/634,552, filed Aug. 8, 2000, which claims priority to and benefit from provisional Application No. 60/160,806, filed Oct. 21, 1999; Application No. 60/163,487, filed Nov. 4, 1999; Application 60/163,398, filed Nov. 4, 1999; Application No. 60/164,442, filed Nov. 9, 1999, Application No. 60/164,194, filed Nov. 9, 1999; Application No. 60/164,314, filed Nov. 9, 1999; Application No. 60/165,234, filed Nov. 11, 1999; Application No. 60/165,239, filed Nov. 11, 1999; Application No. 60/165,356, filed Nov. 12, 1999; Application No. 60/165,355, filed Nov. 12, 1999; Application No. 60/172,348, filed Dec. 16, 1999; Application No. 60/201,335, filed May 2, 2000; Application No. 60/201,157, filed May 2, 2000; Application No. 60/201,179, filed May 2, 2000; Application No. 60/202,997, filed May 10, 2000; and Application No. 60/201,330, filed May 2, 2000. FIELD OF THE INVENTION The present invention relates to telecommunication systems and, in particular, to radio transceiver systems and techniques. BACKGROUND OF THE INVENTION Transceivers are used in wireless communications to transmit and receive electromagnetic waves in free space. In general, a transceiver comprises three main components: a transmitter, a receiver, and an LO generator or frequency synthesizer. The function of the transmitter is to modulate, upconvert, and amplify signals for transmission into free space. The function of the receiver is to detect signals in the presence of noise and interference, and provide amplification, downconversion and demodulation of the detected signal such that it can be displayed or used in a data processor. The LO generator provides a reference signal to both the transmitter for upconversion and the receiver for downconversion. Transceivers have a wide variety of applications ranging from low data rate wireless applications (such as mouse and keyboard) to medium data rate Bluetooth and high data rate wireless LAN 802.11 standards. However, due to the high cost, size and power consumption of currently available transceivers, numerous applications are not being fully commercialized. A simplified architecture would make a transceiver more economically viable for wider applications and integration with other systems. The integration of the transceiver into a single integrated circuit (IC) would be an attractive approach. However, heretofore, the integration of the transceiver into a single IC has been difficult due to process variations and mismatches. Accordingly, there is a need for an innovative transceiver architecture that could be implemented on a single IC, or alternatively, with a minimum number of discrete off chip components that compensate for process variations and mismatches. SUMMARY OF THE INVENTION In one aspect of the present invention, an oscillator circuit includes an oscillator to generate a first signal having a first frequency, a second oscillation source to generate a second signal having a second frequency, and a mixer to mix the first and second signals. In another aspect of the present invention, an oscillator circuit, comprising oscillation means for generating a first signal having a first frequency, signal generation means for generating a second signal having a second frequency, and mixer means for mixing the first and second signals. In yet another aspect of the present invention, a transceiver includes a local oscillator generator having an oscillator with a first signal having a first frequency, a frequency divider coupled to the oscillator to divide the first frequency of the first signal to produce a second signal having a second frequency, the frequency divider having a programmable divisor, and a mixer to mix the first and second signals, and a controller to program the divisor. In still another aspect of the present invention, a method of generating a signal having a signal frequency includes generating a first signal having a first frequency, dividing the first frequency to generate a second signal having a second frequency, and mixing the first and second signals to generate the signal frequency. In a further aspect of the present invention, a method of generating a local oscillator signal having a signal frequency includes generating a first signal having a first frequency, generating a second signal having a second frequency, and mixing the first and second signals to generate the signal frequency. It is understood that other embodiments of the present invention will become readily apparent to those skilled in the art from the following detailed description, wherein it is shown and described only embodiments of the invention by way of illustration of the best modes contemplated for carrying out the invention. As will be realized, the invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not as restrictive.
DESCRIPTION OF THE DRAWINGS These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings where: FIG. 1 is a block diagram of a transceiver in accordance with an exemplary embodiment of the present invention; FIG. 2 is a block diagram of the transceiver blocks including a receiver, transmitter and local oscillator in accordance with an exemplary embodiment of the present invention; FIG. 3 is a block diagram of a mixer in accordance with an exemplary embodiment of the present invention; FIG. 4 is an electrical diagram of a low noise amplifier in accordance with an exemplary embodiment of the present invention; FIG. 4(a) is an electrical diagram of a low noise amplifier in accordance with an another exemplary embodiment of the present invention; FIG. 5 is a block diagram of a four-stage biquad complex bandpass filter in accordance with an exemplary embodiment of the present invention; FIG. 6 is an electrical diagram of one biquad stage of the complex bandpass filter in accordance with an exemplary embodiment of the present invention; FIG. 7 is a graphical depiction of the frequency response on the biquad stage of FIG. 6 in accordance with an exemplary embodiment of the present invention; FIG. 8 is an electrical diagram of one possible input circuit for the biquad stage in accordance with an exemplary embodiment of the present invention; FIG. 9 is an electrical diagram of another possible input circuit for the biquad stage in accordance with an exemplary embodiment of the present invention; FIG. 10 is an electrical diagram of a modified a modified biquad stage of FIG. 6 in accordance with an exemplary embodiment of the present invention; FIG. 11 is a graphical depiction of the frequency response of the modified biquad stage of FIG. 10 accordance with an exemplary embodiment of the present invention; FIG. 12(a) is an electrical diagram of a tunable array of capacitors in accordance with an exemplary embodiment of the present invention; FIG. 12(b) is an electrical diagram of to tunable array of resistors in accordance with an exemplary embodiment of the present invention; FIG. 13 is a block diagram of a complex bandpass filter using polyphase in accordance with an exemplary embodiment of the present invention; FIG. 14 is a block diagram of a programmable multiple stage amplifier in accordance with an exemplary embodiment of the present invention; FIG. 15 is a block diagram of an input and/or output stage for the programmable multiple stage amplifier of FIG. 14 in accordance with an exemplary embodiment of the present invention; FIG. 16(a) is a block diagram of one core amplifier stage of the programmable multiple stage amplifier of FIG. 14 in accordance with an exemplary embodiment of the present invention; FIG. 16(b) is a block diagram of a full-wave rectifier of the of the programmable multiple stage amplifier of FIG. 14 in accordance with an exemplary embodiment of the present invention; FIG. 17(a) is an IF mixer in accordance with an exemplary embodiment of the present invention; FIG. 17(b) is a graphical depiction of a frequency spectrum for the limited IF clocks into the mixer of FIG. 17(a) in accordance with an exemplary embodiment of the present invention; FIG. 17(c) is a graphical depiction of a frequency spectrum for the IF input into the mixer of FIG. 17(a) in accordance with an exemplary embodiment of the present invention; FIG. 17(d) is a graphical depiction of a frequency spectrum for the output of the mixer of FIG. 17(a) in accordance with an exemplary embodiment of the present invention; FIG. 18 is a clock generator in accordance with an exemplary embodiment of the present invention; FIG. 19(a) is a graphical depiction of a clock signal spectrum input into the clock generator of FIG. 18 in accordance with an exemplary embodiment of the present invention; FIG. 19(b) is a graphical depiction of a signal spectrum at the output of a two second stage polyphase filter of the clock generator of FIG. 18 in accordance with an exemplary embodiment of the present invention; FIG. 19(c) is a graphical depiction of the signal spectrum output from a low pass filter of the clock generator of FIG. 18 in accordance with an exemplary embodiment of the present invention; FIG. 20(a) is a graphical depiction of a signal spectrum at the input to a polyphase filter in accordance with an exemplary emb