Charge pump type of negative voltage generator circuit and metho

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

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Details

327537, 327546, 327534, 327 80, 365226, H03K 301, G11C 700

Patent

active

058413146

ABSTRACT:
Disclosed is a charge pump type of negative voltage generator circuit, constructed on a P type substrate and supplying a negative voltage at one output by the pumping of negative charges in n series-connected pumping cells, n being an integer, these pumping cells including P type transistors whose wells are connected to a node to be positively biased. This circuit includes a switching circuit for selectively supplying, at the node, a voltage for biasing of the wells that is greater than or equal to the potential present at the output so long as this potential is greater than a positive reference voltage, and provides a voltage of fixed value for biasing of the wells when the potential present at the output is smaller than the reference voltage. Thus, the appearance of latchup phenomena in the transistors of the pumping cells is prevented.

REFERENCES:
patent: 5077691 (1991-12-01), Haddad et al.
patent: 5120993 (1992-06-01), Tsay et al.
patent: 5448198 (1995-09-01), Toyoshima et al.

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