Analog input circuit with combination sample and hold and filter
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United States of America Patent
Stats
-
Mar 17, 1987
Grant Date -
N/A
app pub date -
Oct 16, 1984
filing date -
Nov 26, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An analog input circuit, which samples and holds predetermined components sampled from input signals, has a filter and a sample and hold circuit which are formed as a unitary structure to simplify the circuit structure. For this purpose, the operational amplifier of the filter is constituted by two stages of voltage-follower circuits that are connected in series via a switch, and a holding capacitor is connected to the the switch. When the switch is closed, the holding capacitor assumes the same potential as the output of the filter and when the switch is opened, the holding capacitor maintains the output voltage of the filter.
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