Substrate biasing circuit having controllable ring oscillator

Details Substrate biasing circuit having controllable ring oscillator Substrate biasing circuit having controllable ring oscillator

1997-09-05

1998-09-15

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327535, 327537, G05F 110

Patent

active

058085050

ABSTRACT:
A substrate biasing circuit is disclosed which includes a ring oscillator oscillating to a drive pulse signal, a charge pump circuit connected to the ring oscillator to receive the drive pulse signal and generating a substrate-bias voltage in response thereto, and a current control circuit connected to the ring oscillator. The ring oscillator includes a plurality of delay circuits and the current control circuit controls each of the delay circuits such that a current flowing there through is stabilized against the variation in power voltage and relative to a threshold voltage of a transistor for the charge pump circuit.

REFERENCES:
patent: 4455493 (1984-06-01), Morton et al.
patent: 4692689 (1987-09-01), Takemae
patent: 4695745 (1987-09-01), Mimoto et al.
patent: 4853654 (1989-08-01), Sakurai
patent: 5041739 (1991-08-01), Goto
patent: 5043597 (1991-08-01), Furvyama et al.
patent: 5066870 (1991-11-01), Kobatake
patent: 5180995 (1993-01-01), Hayashi et al.
patent: 5302919 (1994-04-01), Abe
patent: 5347171 (1994-09-01), Cordoba et al.
"Design of CMOS Ultra LSI", issued on Apr. 25, 1989, pp. 193-195.

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