Source: https://patents.google.com/patent/US7616061?oq=5%2C966%2C702
Timestamp: 2018-02-20 10:07:43
Document Index: 337424818

Matched Legal Cases: ['§ 119', 'Application No. 2005', 'art 1', 'art 1', 'art 2', 'art 2', 'art 106', 'art 106', 'art 2', 'art 110', 'art 120', 'art 110', 'art 120']

US7616061B2 - Low noise amplifier for ultra wide band - Google Patents
Low noise amplifier for ultra wide band
US7616061B2
US7616061B2 US11336788 US33678806A US7616061B2 US 7616061 B2 US7616061 B2 US 7616061B2 US 11336788 US11336788 US 11336788 US 33678806 A US33678806 A US 33678806A US 7616061 B2 US7616061 B2 US 7616061B2
US11336788
US20060170502A1 (en )
Choong-yul Cha
H03F1/483—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with field-effect transistors
A low noise amplifier (LNA) for ultra wide band receives and amplifies identical RF signals in different frequency bands, and includes more than one pair of narrow band LNAs coupled in parallel, and a load circuit which increases load impedance of the entire circuit of the narrow band LNAs. The LNA can not only amplify the RF signal in the UWB but also obtain the low noise and the high gain that are features of the conventional narrow band LNA.
This application claims the benefit under 35 U.S.C. § 119(a) from Korean Patent Application No. 2005-9135 filed on Feb. 1, 2005 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference.
U.S. Pat. No. 6,735,421 (hereafter, referred to as a prior art 1) titled, “Receiver Including Low Noise Amplifier And Frequency Down-Converter For A Wireless Telecommunication System,” describes a narrow band LNA including a field effect transistor (FET), a resistor R3 and a capacitor C1 for the negative feedback connected in parallel between a gate terminal and a drain terminal of the FET as shown in FIG. 2. The resistor R3 and the capacitor C1 reduce the gain in the low frequency and prevent the amplifier from getting high gain in the low frequency. In other words, the RC feedback design increases the output with respect to the input of the LNA and expands the bandwidth rather than reducing the gain. As a result, the prior art 1 can realize the LNA for the wide band but produces high NF and low gain.
U.S. Pat. No. 6,806,777 (hereafter, referred to as a prior art 2 titled “Ultra Wide Band Low Noise Amplifier And Method” discloses a wide band LNA using a common-gate input as shown in FIG. 3. The LNA of the prior art 2 includes a cascode 102 with a load tracking (LT) network 104, and a common-gate part 106. The common-gate part 106 is in a common-gate amplifier arrangement since an RF signal is input to its source and its gate is AC grounded. Hence, the wide band amplifier can be designed since an RFin terminal can match the wide band impedance. However, the LNA of the prior art 2 cannot obtain high gain due to the impedance but produces high NF as the RF signal is input to the source.
Embodiments of the present invention have been provided to address the above-mentioned and other problems and disadvantages occurring in the conventional arrangement, and aspects of these embodiments provide a low noise amplifier (LNA) for ultra wide band (UWB) with high gain and low noise by use of narrow band LNAs.
A general narrow band low noise amplifier (LNA), as shown in FIG. 4, employs inductors at a source and a gate of an amplifying element and thus generates an impedance input to the LNA up to 50 Ω.
Generally, the impedance of an RF signal input to a narrow band LNA is 50 Ω. For the sake of impedance matching, the inductances of the inductors LG1 and LS1 connected to the amplifying element M1 may be set such that the first amplification part 110 has an input impedance of 50 Ω at or near its center frequency, and the inductances of the inductors LG2 and LS2 connected to the amplifying element M2 may be set such that the second amplification part 120 has an input impedance of 50 Ω at or near its center frequency. In other words, the inductances of the respective inductors may be set to be suitable to the different sizes of the amplifying elements M1 and M2 so that at or near the frequencies of the RF signal amplified at the amplifying elements M1 and M2 having the different sizes, the RF signal impedance matches or approaches the input impedances of the first amplification part 110 and the second amplification part 120.
more than one pair of LNAs which is coupled in parallel, and receives and amplifies identical RF signals in different frequency bands; and
a load circuit which increases load impedance of an entire circuit of the LNAs, wherein the LNAs are narrow band LNAs,
wherein each LNA comprises an amplifying element fabricated in a different size designed to amplify a different frequency band.
2. The low noise amplifier of claim 1, wherein the narrow band LNAs each include an amplifying element and a pair of inductors which is connected to a source and a gate of the amplifying element respectively.
4. The low noise amplifier of claim 2, wherein the amplifying element of each narrow band LNA is connected to a common-gate amplifying element which forms a cascode amplifier together with the amplifying element, and the common-gate amplifying element has a common gate input.
6. The low noise amplifier of claim 5, further comprising: a buffer amplifying element which includes the load circuit located between a gate and a drain of the buffer amplifying element.
7. A low noise amplifier (LNA) for ultra wide band (UWB), comprising:
a plurality of LNAs coupled in parallel, wherein each LNA receives an identical RF signal and amplifies the RF signal in different frequency bands; and
a load circuit which increases load impedance of the entire circuit of the LNAs, wherein the LNAs are narrow band LNAs,
8. The low noise amplifier of claim 7, wherein each narrow band LNA comprises:
an inductor connected to a source of the amplifying element; and
an inductor connected to a gate of the amplifying element.
9. The low noise amplifier of claim 8, wherein the amplifying element is one of an NMOS transistor, a high electron mobility transistor (HEMT), and a bipolar transistor.
10. The low noise amplifier of claim 8, wherein the inductor connected to the source of the amplifying element and the inductor connected to the gate of the amplifying element are sized to provide a 50 Ω input impedance for each narrow band LNA.
11. A low noise amplifier (LNA) for ultra wide band (UWB), comprising:
wherein each narrow band LNA comprises:
an amplifying element;
an inductor connected to a gate of the amplifying element,
wherein each amplifying element is fabricated in a different size designed to amplify a different frequency band.
US11336788 2005-02-01 2006-01-23 Low noise amplifier for ultra wide band Active 2026-11-10 US7616061B2 (en)
KR20050009135A KR100667303B1 (en) 2005-02-01 2005-02-01 Low noise amplifier for ultra-wide band
KR2005-9135 2005-02-01
US12352380 US7847636B2 (en) 2005-02-01 2009-01-12 Low noise amplifier for ultra wide band
US20060170502A1 true US20060170502A1 (en) 2006-08-03
US7616061B2 true US7616061B2 (en) 2009-11-10
ID=36755908
US11336788 Active 2026-11-10 US7616061B2 (en) 2005-02-01 2006-01-23 Low noise amplifier for ultra wide band
US12352380 Expired - Fee Related US7847636B2 (en) 2005-02-01 2009-01-12 Low noise amplifier for ultra wide band
US (2) US7616061B2 (en)
KR (1) KR100667303B1 (en)
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHA, CHOONG-YUL;KIM, HOON-TAE;LEE, SANG-GUG;REEL/FRAME:017500/0958