Common-mode feedback circuit

Details Common-mode feedback circuit Common-mode feedback circuit

2006-02-28

2006-02-28

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S258000, C330S257000

Reexamination Certificate

active

07005921

ABSTRACT:
A common-mode feedback circuit is provided for fully-differential operational amplifier stages of a multistage amplifier. A first stage of the circuit establishes a substantially constant current output level for a feedback generating stage of the circuit. An exemplary embodiment using MOSFET devices illustrates using a diode-connected MOSFET and mirror MOSFET first stage and a generating the current for a common-source connected MOSFET second stage connected to the respective outputs for said fully-differential operational amplifier. An output stage of the circuit provides feedback voltage at a first level when inputs to said fully-differential operational amplifier are in equilibrium and at a second level for balancing said fully-differential operational amplifier when inputs to said fully-differential operational amplifier are not in equilibrium.

REFERENCES:
patent: 4568885 (1986-02-01), McKenzie et al.
patent: 5321370 (1994-06-01), Yukawa
patent: 5410274 (1995-04-01), Birdsall et al.
patent: 5847601 (1998-12-01), Wang
patent: 6087897 (2000-07-01), Wang

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