Transconductor circuit

Details Transconductor circuit Transconductor circuit

2011-03-22

2011-03-22

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including combined diverse-type semiconductor device

C330S253000

Reexamination Certificate

active

07911276

ABSTRACT:
A low noise, highly linear transconductor circuit, which may be applied, e.g., in communication systems, includes a first input node for receiving a first input signal of the transconductor circuit and a second input node for receiving a second input signal of the transconductor circuit, and at least a first amplifier, a second amplifier, and a first, second and third resistor. Each of the first and second amplifiers includes an input stage with a combination of at least a transistor of the MOS type and a transistor of the bipolar type, and an output stage for providing a respective output signal of the transconductor circuit and having at least a transistor of the bipolar type. The circuit achieves reduced noise due to output current reuse in the input stage of the amplifiers and cross coupling of bias resistors to result in a highly linear transconductor circuit having very low noise.

REFERENCES:
patent: 4418321 (1983-11-01), Bohme
patent: 5489876 (1996-02-01), Pernici
patent: 5847607 (1998-12-01), Lewicki et al.
patent: 7408409 (2008-08-01), Kern

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