Integrated switched-capacitor filter with improved frequency characteristics
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United States of America Patent
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Sep 6, 1988
Issued Date -
N/A
app pub date -
Oct 15, 1987
filing date -
Nov 18, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A switched-capacitor filter constituted in the form of a semiconductor integrated circuit has an input circuit which consists of at least one noninversion-type switched-capacitor and at least two inversion-type switched-capacitors that are connected in parallel with each other. The two inversion-type switched-capacitors have different writing timings and reading timings relative to each other. With this setup, capacitances of the switched-capacitors need not be extremely increased even when it is desired to maintain a zero-point frequency of the filter at a very low value. Further, there is no need of providing a circuit such as sample holding circuit which requires extra area and consumes additional electric power.
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