Linear amplifier using non-linear CMOS capacitors

Details Linear amplifier using non-linear CMOS capacitors Linear amplifier using non-linear CMOS capacitors

2005-04-05

2005-04-05

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S110000, C330S069000

Reexamination Certificate

active

06876255

ABSTRACT:
The invention provides an amplifier circuit made by digital CMOS processes, the amplifier circuit comprising a main operational amplifier with at least one input and at least one output and a feedback loop including a non-linear gateoxide capacitor, wherein a voltage control means is connected to the main operational amplifier to provide a voltage difference between the output common mode voltage and the input common mode voltage of the main operational amplifier to apply a DC biasing voltage across the non-linear gateoxide capacitor sufficient to operate the non-linear gateoxide capacitor in a bias range where the capacity of the none-linear gateoxide capacitor is almost independent of the applied voltage comprising the bias voltage plus a signal voltage.

REFERENCES:
patent: 5789981 (1998-08-01), Singer et al.
patent: 5847604 (1998-12-01), Dekker
patent: 6377120 (2002-04-01), Hsieh

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