Compensated, bias-dependent signal filter and amplifier circuit

Details Compensated, bias-dependent signal filter and amplifier circuit Compensated, bias-dependent signal filter and amplifier circuit

1998-06-12

1999-07-06

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330306, H03F 304

Patent

active

059202327

ABSTRACT:
A compensated, bias-dependent signal filtration and amplification circuit includes a low-pass RC filter with a bias-dependent frequency response caused by the use of MOS transistors connected as capacitors with bias-dependent capacitances. A dc current source is used, in cooperation with the resistors of the RC filter, to generate a fixed bias for the capacitor-connected MOS transistors and thereby eliminate the bias dependencies of the capacitances. Following amplification of the filtered signal, another dc current is subtracted out from the amplified output signal so as to eliminate any residual dc signal components due to the input compensation dc bias signal, thereby leaving only the amplified filtered ac signal components.

REFERENCES:
patent: 4843343 (1989-06-01), Pace
patent: 5241284 (1993-08-01), Nyqvist et al.
patent: 5412335 (1995-05-01), Jackson et al.
patent: 5666086 (1997-09-01), Klein

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