Amplifiers – With periodic switching input-output
Reexamination Certificate
2008-10-15
2010-11-16
Nguyen, Khanh V (Department: 2817)
Amplifiers
With periodic switching input-output
C327S124000
Reexamination Certificate
active
07834685
ABSTRACT:
An apparatus includes a plurality of amplifier stages configured to receive an input voltage and generate an amplified output current. Each amplifier stage includes a transconductance stage configured to receive the input voltage and generate a first intermediate output current. Each amplifier stage also includes an auto-zeroing loop configured to generate a second intermediate output current that at least partially corrects for an offset of the transconductance stage, where the auto-zeroing loop operates at a first frequency. Each amplifier stage further includes chopping circuitry configured to reverse a polarity of the input voltage and a polarity of the amplified output current at a second frequency, where the second frequency is less than the first frequency. Each amplifier stage is configured to operate in auto-zeroing and amplification phases. At least one amplifier stage operates in the auto-zeroing phase when at least one other amplifier stage operates in the amplification phase.
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National Semiconductor Corporation
Nguyen Khanh V
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