Fully differential sensing apparatus and input common-mode...

Details Fully differential sensing apparatus and input common-mode... Fully differential sensing apparatus and input common-mode...

2008-04-15

2008-04-15

Choe, Henry (Department: 2817)

Amplifiers

Sum and difference amplifiers

C330S258000

Reexamination Certificate

active

07358805

ABSTRACT:
A fully differential sensing apparatus and an input common mode feedback circuit are provided. The input common mode feedback circuit includes a common mode error amplifier and a plurality of adaptive conductance elements. Each adaptive conductance element behaves with a low impedance characteristic when its anode voltage is greater than its cathode voltage by a positive threshold voltage or, on the contrary, when the anode voltage of such an adaptive conductance element is lower than its cathode voltage by a negative threshold voltage, the adaptive element also behaves with a low impedance characteristic; otherwise the aforementioned adaptive conductance element behaves with a high impedance characteristic. The common mode error amplifier and a plurality of such adaptive conductance elements form a negative feedback loop to effectively maintain the input common voltage of a fully differential input amplifier, which can be used for a fully differential sensing apparatus.

REFERENCES:
patent: 6498530 (2002-12-01), Tang
patent: 6573785 (2003-06-01), Callicotte et al.
patent: 6798280 (2004-09-01), Rossi
patent: 6822509 (2004-11-01), Muza

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