Differential amplifier circuit and frequency mixer for...

Details Differential amplifier circuit and frequency mixer for... Differential amplifier circuit and frequency mixer for...

2008-12-01

2010-10-05

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

07808319

ABSTRACT:
A differential amplifier circuit and a frequency mixer for improving linearity are disclosed. The disclosed differential amplifier circuit includes first and second loads, a first output terminal for the first load, a second output terminal for the second load, a differential amplifying stage including a differential stage for amplifying a voltage difference between a first input stage and a second input stage, and a biasing current source for biasing the differential stage, and a non-linearity filtering circuit for filtering a non-linear signal generated from the differential amplifying stage. The non-linearity filtering circuit includes a first cross circuit including a first transistor to connect the first and second output terminals, and a second cross circuit including a second transistor to connect the first and second output terminals. The differential amplifier circuit achieves an improvement in linearity, as compared to conventional differential amplifier circuits, by offsetting, at a load side, a non-linear component generated at an active element of the differential amplifier circuit, to output only a linear current component.

REFERENCES:
patent: 7633341 (2009-12-01), Bagheri et al.
patent: 10-2005-0064114 (2005-06-01), None

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