High frequency continuous time filter
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United States of America Patent
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Nov 5, 1991
Grant Date -
N/A
app pub date -
Mar 28, 1990
filing date -
Mar 28, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high-frequency integrated circuit continuous time low pass filter. An on-chip oscillator is built into the filter. The filter frequency accuracy is established by trimming the frequency of the on-chip oscillator during wafer probe. The oscillator is off during normal operation of the filter. Therefore, the filter does not produce noise that will degrade the performance of the filter during normal operation. After trimming, the filter design is such that accuracy is maintained even during temperature and power supply changes. The adjustment can be made without the oscillator by direct measurement of the filter response.
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