Highly linear transconductance circuit and filter using same

Details Highly linear transconductance circuit and filter using same Highly linear transconductance circuit and filter using same

1998-12-31

2000-08-15

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

330296, H03F 304

Patent

active

061042498

ABSTRACT:
An integrated circuit includes a transconductance circuit having a bias current generator coupled to a power supply. The bias current generator may include a current mirror circuit having an input and an output, where a current at the output is proportional to a current at the input. A first constant current source in the transconductance circuit has a first electrode coupled to the power supply. The transconductance circuit also includes first and second transistors and a diode. The diode is forward biased by the bias current generator. The first transistor has a collector coupled to a second electrode of the first constant current source and to a signal output. The second transistor has a drain coupled to an emitter of the first transistor, a source coupled to a reference voltage and a gate coupled to a signal input. The diode has an anode coupled to a base of the first transistor and a cathode coupled to a constant voltage source. The current through the diode results in a drain-source voltage of the second transistor being constant. As a result, the transconductance circuit operation is linearized, and distortion due to drain-source voltage variation in the second transistor is reduced.

REFERENCES:
patent: 4356454 (1982-10-01), Sueyoshi et al.
patent: 4956615 (1990-09-01), Bohme et al.
patent: 5304946 (1994-04-01), Sano et al.
patent: 5576646 (1996-11-01), Rezzi et al.

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