Amplifier circuit for double sampled architectures

Details Amplifier circuit for double sampled architectures Amplifier circuit for double sampled architectures

2005-08-17

2008-11-11

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S359000

Reexamination Certificate

active

07449923

ABSTRACT:
A double sampled switched capacitor architecture as described herein includes an amplifier having two separate inputs corresponding to two separate amplifier sections. The amplifier uses a first differential transistor pair for the first amplifier section, a second differential transistor pair for the second amplifier section, a first tail current bias arrangement for the first differential transistor pair, and a second tail current bias arrangement for the second differential transistor pair. The tail current bias arrangements are driven by a bias switching architecture that alternately activates one tail current bias arrangement while at least partially deactivating the other tail current bias arrangement. The amplifier and bias switching architecture cooperate to eliminate gain error that would otherwise be caused by a common parasitic capacitance shared by a single amplifier section.

REFERENCES:
patent: 6040731 (2000-03-01), Chen et al.
patent: 6313688 (2001-11-01), Lee et al.
patent: 6348830 (2002-02-01), Rebeiz et al.
patent: 6438365 (2002-08-01), Balteanu
patent: 2002/0030529 (2002-03-01), Lee et al.
patent: 2006/0001472 (2006-01-01), Krug et al.

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