Amplification circuit improved with linearity and frequency...

Details Amplification circuit improved with linearity and frequency... Amplification circuit improved with linearity and frequency...

2008-07-29

2008-07-29

Choe, Henry K (Department: 2817)

Amplifiers

Interstage coupling

Transformer coupling

C330S296000

Reexamination Certificate

active

07405619

ABSTRACT:
Provided is a frequency converter using an amplification circuit that is improved with linearity by coupling a main transistor and an auxiliary transistor in parallel. An amplification circuit that is improved with linearity comprises an input block amplifying an input signal, an induction block inducing a current proportionate to an output signal of the input block and an amplification block comprising. The amplification block comprises a main transistor amplifying the output signal of the induction block, wherein the main transistor is biased to operate at a saturation region and an auxiliary transistor amplifying the output signal of the induction block, wherein the auxiliary transistor is biased to operate at a subthreshold region and coupled to the main transistor in parallel.

REFERENCES:
patent: 3038072 (1962-06-01), Proudfit
patent: 3886458 (1975-05-01), Matsumoto et al.
patent: 3946280 (1976-03-01), Quist
patent: 3949306 (1976-04-01), Watanabe et al.

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