Track and hold with dual pump circuit
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United States of America Patent
Stats
-
May 4, 2004
Grant Date -
Aug 14, 2003
app pub date -
Dec 3, 2002
filing date -
Feb 13, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual pump circuit including a transmission gate and a dual charge pump. The transmission gate includes a p-channel transistor and an n-channel transistor, each having a control terminal and a pair of current terminals coupled between a dual pump input and a dual pump output. The dual charge pump includes first and second pump circuits, where each pump circuit is coupled to the dual pump input and to a control terminal of a corresponding one of the transmission gate transistors. Each pump circuit is operative to linearize operation of its corresponding transmission gate transistor by maintaining VGS--VT constant. The dual pump circuit is used in a track and hold circuit including at least one dual pump sampling circuit, at least one sampling capacitor, and a control circuit for controlling input signal sampling timing. Each dual pump sampling circuit includes the transmission gate and a dual charge pump.
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