Integrated, high speed, zero hold current and delay compensated charge pump
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Oct 14, 1987
filing date -
Oct 14, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An integrated, high speed, zero hold current and delay compensated charge pump operable at one of two different selectable pumping currents. The charge pump includes first and second supply terminals, a first input terminal for receiving digital charge-up control signals, a second input terminal for receiving digital charge-down control signals, and an output terminal. A first transistorized differential amplifier controls a first current flow of a first polarity between the first supply terminal and the output terminal as a function of the charge-up control signals. A second differential amplifier controls a second current flow between the first and second supply terminals as a function of the charge-down control signals. A pump current mirror produces a mirrored second current flow of a second polarity between the output terminal and the second supply terminal as a function of the second current flow.
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