Notch filter for ripple reduction

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United States of America Patent

PATENT NO RE48112
SERIAL NO

16043486

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Abstract

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A notch filter is controlled synchronously with a chopper to filter out chopping ripple. In one embodiment, the notch filter is coupled to the differential output of the chopper and includes a sampling capacitor, a hold capacitor, and a second set of switches between the sampling capacitor and the hold capacitor. The second set of switches is temporarily closed once per chopper switching cycle to transfer charge from the sampling capacitor to the hold capacitor such that the ripple from the chopper is not transferred to the hold capacitor. The voltage across the hold capacitor may be coupled to any other circuit, such as to the differential inputs of an amplifier.

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Patent Owner(s)

Patent OwnerAddress
LINEAR TECHNOLOGY LLCMILPITAS CA 95035

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Petrofsky, Joseph G Nevada City, US 13 353
Wong, Jeremy H Sunnyvale, US 2 11

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