Switched capacitor sampling filter
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United States of America Patent
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Mar 13, 1990
Grant Date -
N/A
app pub date -
Aug 24, 1988
filing date -
Aug 26, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This filter circuit comprises at least one basic cell (2) arranged as a switched capacitor sampling filter, together with a clock suitable for defining two different states for controlling sampling. According to the main characteristic of the invention, the circuit includes upstream switching means (4) suitable for inverting the polarity of the signal input to the cell during one of the two states, and downstream switching means (6) suitable for inverting the output signal from the cell (2). This makes it possible to transpose the filtering frequency band of the cell (2). The circuit is applicable to manufacturing switched capacitor sampling filters in the form of integrated circuits.
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