Substrate bias generating circuitry stable against source voltag

Details Substrate bias generating circuitry stable against source voltag Substrate bias generating circuitry stable against source voltag

1990-05-07

1992-05-12

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072968, H03K 301

Patent

active

051130882

ABSTRACT:
Substrate bias generating circuitry for generating a substrate bias to be applied to the substrate of an integrated circuit. The circuitry includes an oscillator circuit for generating oscillator pulses having a predetermined frequency. A charge pump circuit has a capacitor and charges and discharges the capacitor in response to the oscillator pulses for generating the substrate bias. A substrate bias level sensing circuit is responsive to the voltage level of the substrate bias for outputting a control signal associated with the sensed voltage level. The level sensing circuit has a level holding subcircuit for holding the control signal in an enabled state at least for a predetermined duration which is four times as long as a period of time necessary for the charge pump circuit to complete a pumping operation. The pumping operation of the charge pump circuit is controlled by the control signal.

REFERENCES:
patent: 4142114 (1979-02-01), Green
patent: 4439692 (1984-03-01), Beekmans et al.
patent: 4471290 (1984-09-01), Yamaguchi
patent: 4794278 (1988-12-01), Vajdic
Japanese Laid-Open publication No. 57-121269 of Jul. 28, 1982.
Japanese Laid-Open publication No. 62-190746 of Aug. 20, 1987.

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