DC-DC impedance transformer charge pump
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United States of America Patent
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-
May 17, 1988
Issued Date -
N/A
app pub date -
Feb 17, 1987
filing date -
Aug 5, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit is disclosed that includes a pair of varactors coupled to an input sample circuit and having an appropriate capacitance during the sample strobe of the input to minimize sampling errors. The varactors are combined with a control switch having an output timed to symmetrically reduce the capacitance to a new value, preferably a value approaching the input capacitance of a field effect transistor which is included in the output circuit. In this way, a noise-free voltage and power gain of CT0/CT1 can be reached, where CT0 is the initial value of the capacitance of the sampling circuit and CT1 is the final value of the capacitance of the sampling circuit.
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