DC/DC voltage multiplier with selective charge/discharge
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United States of America Patent
Stats
-
Mar 10, 1992
Grant Date -
N/A
app pub date -
May 21, 1991
filing date -
Jun 13, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A DC/DC voltage multiplier comprises a charging source (Vs) connected between first and second terminals (Vdd and Vss), a storage capacitor (Ctr) connected between the first terminal and a third terminal (Vdd and Vtr), a plurality of voltage pump stages each comprising four switches (S1a, S1b and S1c) and a pump capacitor (C1). The switches are actuated under the control of a clock (not shown) so that the pump capacitors of the stages are charged one at a time. The multiplied voltage output between the first and third terminals Vdd and Vtr of the circuit is provided by the charging source (Vs) and the pump capacitors in those stages not currently being charged (C2,C3). Any number of voltage pump stages can be used provided that the output of each stage is connected to the input of the following stage and the circuit is driven by an appropriate clock. The output of the final stage is connected to the input of the first stage so as to form a ring of pump stages.
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