Notch filter for ripple reduction
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United States of America Patent
Stats
-
Jul 21, 2020
Grant Date -
N/A
app pub date -
Jul 24, 2018
filing date -
Aug 25, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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.
First Claim
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International Classification(s)
- 2018 Application Filing Year
- H02M Class
- 3114 Applications Filed
- 2528 Patents Issued To-Date
- 81.19 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- H02M Class
- 0 % this patent is cited more than
- 5 Age
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