Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-05-09
1999-05-25
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327534, 327143, 327543, 327546, G05F 110
Patent
active
059072571
ABSTRACT:
A bias voltage generator generates the same bias voltage VBB for different external power supply voltages EVCC (for example, for EVCC=3.3V or 5.0V). During power-up, the charge pump that generates VBB is controlled by an enable signal ExtEn referenced to EVCC. Later an internal supply voltage IVCC becomes fully developed to a value independent from EVCC (for example, IVCC=3.0V), and the charge pump becomes controlled by an enable signal IntEn referenced to IVCC. This enable signal IntEn will cause VBB to reach its target value, for example, -1.5V. This target value is independent of EVCC. During power-up, when the charge pump is controlled by ExtEn, the bias voltage VBB is driven to an intermediate value (for example, -0.5V or -1V). This intermediate value depends on EVCC, but is below the target value in magnitude. The intermediate value reduces the likelihood of latch-up during power-up, but the intermediate value does not go beyond the target value thus does not create a significant pn-junction current leakage in semiconductor regions to which the bias voltage is applied.
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Li Li-Chun
Liu Lawrence
Murray Michael A.
Callahan Timothy P.
Kim Jung Ho
Mosel Vitelic Corporation
Shenker Michael
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