Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1999-01-15
2000-02-08
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327537, G05F 302
Patent
active
060231882
ABSTRACT:
A two-phase high voltage generator circuit is electronically reconfigurable to output positive (V.sub.Pp) or negative (V.sub.Pn) high voltage, depending upon whether positive or negative mode operation is selected. The circuit includes a plurality of series-connected charge multiplier stages that each comprises a MOS transistor and a charging capacitor. Collectively the stages define an anode node and a cathode node. One of two non-overlapping phase signals is coupled to the free end of each charging capacitor such that adjacent charging capacitors are driven by different phases. First and second two-way multiplexers (MUX1, MUX2) control voltages presented to the anode and cathode nodes, to determine whether circuit operation is positive or negative mode. The MOS devices may be PMOS or NMOS, and preferably Vt-cancellation is provided for each charging stage. A precharge/discharge circuit preferably is coupled to each voltage node including the load capacitor. Further, substrate-well protection is provided such that the MOS devices are less prone to exhibit voltage breakdown or substrate to source/drain current flow.
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Hsu Fu-Chang
Lee Peter W.
Tsao Hsing-Ya
Aplus Flash Technology Inc.
Cunningham Terry D.
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