Multistage common mode feedback for improved linearity line...

Amplifiers – Sum and difference amplifiers

Reexamination Certificate

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C330S258000

Reexamination Certificate

active

07034611

ABSTRACT:
A technique to attenuate even-order harmonics of an output stage of a multistage nested Miller compensation circuit. In one example embodiment, this is accomplished by using a low-bandwidth low-swing amplifier in the common mode feedback loop to improve the even-order harmonic performance in the signal path. The technique uses a separate multistage loop for the common mode feedback loop to attenuate the even-order harmonics. The common mode feedback loop is the fourth stage and uses the third stage of the nested Miller compensation circuit. The fourth stage of the common mode feedback loop includes a single harmonic and uses a low voltage supply to achieve lower power consumption by the common mode feedback loop.

REFERENCES:
patent: 4161693 (1979-07-01), Carlson
patent: 4472689 (1984-09-01), Fukushima et al.
patent: 5917376 (1999-06-01), Ivanov et al.
patent: 6313704 (2001-11-01), Maruyama et al.

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