Substrate bias generator including multivibrator having frequenc

Details Substrate bias generator including multivibrator having frequenc Substrate bias generator including multivibrator having frequenc

1986-02-18

1987-12-01

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307200B, 307269, 307271, 307296R, 307475, 307496, H03L 100, G05F 156

Patent

active

047106476

ABSTRACT:
A CMOS charged pump circuit for biasing the N well of a memory array. The present invention utilizes a multivibrator oscillator coupled to a constant current source to provide a frequency output which is independent of the supply voltage. The multivibrator oscillator uses less power than prior art ring oscillators. Feedback through a comparator circuit is used to monitor the N well voltage so that the multivibrator oscillator and ultimately the charge pump may be duty cycled to further reduce power consumption.

REFERENCES:
patent: 4409496 (1983-10-01), Baba
patent: 4471290 (1984-09-01), Yamaguchi
patent: 4507572 (1985-03-01), Hashimoto et al.
patent: 4622480 (1986-11-01), Uchimura et al.
patent: 4631421 (1986-12-01), Inoue et al.
patent: 4670668 (1987-06-01), Liu
Hummel, "Sentry Circuit for Substrate Voltage Control", IBM T.D.B., vol. 15, No. 2, Jul. 1972, pp. 478-479.
Harroun, "Substrate Bias Voltage Control", IBM T.D.B., vol. 22, No. 7, Dec. 1979, pp. 2691-2692.

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