Amplifiers – With periodic switching input-output
Reexamination Certificate
2010-06-28
2011-12-06
Nguyen, Patricia (Department: 2817)
Amplifiers
With periodic switching input-output
C330S069000, C330S310000, C330S098000, C327S124000, C327S307000
Reexamination Certificate
active
08072262
ABSTRACT:
A chopper-stabilized circuit (1) includes pre-chopping circuitry (26) for chopping an input signal (Vin) at a first frequency to generate a first signal. Input chopping circuitry (9) chops the first signal at a second frequency substantially greater than the first frequency to produce a second signal. The first frequency is a sub-harmonic of the second frequency. Post-chopping circuitry (30) chops the second chopped signal at the first frequency to produce a third signal that is applied to an input of a signal conditioning circuit (2). The output chopping circuitry (10) chops an output of the signal conditioning circuit at the second frequency to generate a fourth signal. The fourth signal is filtered.
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“A Micropower Chopper-Stabilized Operational Amplifier Using a SC Notch Filter With Synchronous Integration Inside the Continuous-Time Signal Path” by Rod Burt and Joy Zhang, IEEE Journal of Solid-State Circuits, vol. 41, No. 12, Dec. 2006, pp. 2729-2736.
Burt Rodney T.
Zhang Joy Y.
Brady III Wade J.
Nguyen Patricia
Patti John J.
Telecky, Jr. Fredrick J.
Texas Instruments Incorporated
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