Dual bandwidth autozero loop for a voice frequency CODEC
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United States of America Patent
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Sep 21, 1982
Grant Date -
N/A
app pub date -
Jul 18, 1980
filing date -
Jul 18, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An autozero loop for eliminating offsets in the analog to digital converter section of a voice frequency coder-decoder (CODEC) utilizing an array of capacitors and a linear resistor string. The autozero loop functions with a relatively small time constant to null offsets quickly during the power-up phase of CODEC operation and with a higher time constant after the power-up phase. A dual bandwidth sub-circuit in the loop is connected to a voltage generator and controlled by signals from a logic circuit to operate at different bandwidths and thus provide different offset cancelling feedback signals during the power-up and normal operating phases.
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