Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Reexamination Certificate
2005-05-10
2005-05-10
Nuton, My-Trang (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
C327S074000
Reexamination Certificate
active
06891430
ABSTRACT:
A signal processing integrated circuit has having a chopper stabilized, multistage, feedforward amplifier and a delta sigma analog to digital converter. Filtering of the output of the output from the analog to digital converter comprises a sinc5filter and a sinc3filter. The sinc3filter may be bypassed. A rough buffer permits quick charging of a sample and hold capacitor during part of the charge cycle and slower but more accurate charging during the remainder of the charge cycle.
REFERENCES:
patent: 4488824 (1984-12-01), Salem
patent: 4498781 (1985-02-01), Kaplit
patent: 6002299 (1999-12-01), Thomsen
Amar Aryesh
Angel Edwin De
Thomsen Axel
Wang Lei
Wu Sherry
Cirrus Logic Inc.
Murphy James J.
Nuton My-Trang
Thompson & Knight LLP
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