RF mixer circuit and method of operation

Details RF mixer circuit and method of operation RF mixer circuit and method of operation

1999-03-29

2000-08-15

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327356, G06F 744

Patent

active

061042277

ABSTRACT:
An RF mixer (10) provides signal gain in a transconductor block (12). A first transistor (36) is sized M times larger than a second transistor (18) to generate the desired signal gain. The gain of the RF mixer (10) is the value M times an output impedance Z.sub.OUT divided by an input impedance Z.sub.IN. A first current (I.sub.40) conducted by the first transistor (36) is matched to a sum of the second current (I.sub.24) conducted by the second transistor (18) and a third current (I.sub.28). The first current is supplied to a first differential transistor pair (46, 48) and the summed current is supplied to a second differential transistor pair (56, 58) to provide balance in switching circuit (50).

REFERENCES:
patent: 4388540 (1983-06-01), Schreurs
patent: 5151625 (1992-09-01), Zarabadi et al.
patent: 5826182 (1998-10-01), Gilbert
patent: 5886547 (1999-03-01), Durec et al.

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