Differential low noise amplifier with low power consumption

Details Differential low noise amplifier with low power consumption Differential low noise amplifier with low power consumption

2007-02-13

2007-02-13

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000, C330S311000

Reexamination Certificate

active

11022050

ABSTRACT:
A low noise differential amplifier has a pair of single ended common-gate or common-base circuits and cross coupling of an input of one of the pair to the gate or base of the other one of the pair. This cross-coupling puts the differential input voltage over the Gate-Source of the common-gate transistor (or Base-Emitter of the common base transistor). This means that the same input impedance and gain can be made with half the current compared to a basic common-gate topology. The cross-coupling means the noise generated by the positive side of the common-gate structure ends up partly on the negative output and vice versa, and so the Noise Figure can be less than 3 dB.

REFERENCES:
patent: RE31545 (1984-03-01), Quinn
patent: 4462002 (1984-07-01), Schade, Jr.
patent: 4901031 (1990-02-01), Kalthoff et al.
patent: 5602508 (1997-02-01), Endou et al.
patent: 6417737 (2002-07-01), Moloudi et al.
patent: 6580323 (2003-06-01), Mateman et al.
patent: 6985035 (2006-01-01), Khorramabadi
patent: WO03/085821 (2003-10-01), None
European Search Report from corresponding European National Application No. 03079182, filed Dec. 24, 2003.

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