Substrate potential adjusting apparatus

Details Substrate potential adjusting apparatus Substrate potential adjusting apparatus

1992-02-26

1993-11-23

Mis, David

Oscillators

Ring oscillators

331 49, 331179, 3072962, H03B 524, H03K 301

Patent

active

052648087

ABSTRACT:
A substrate potential adjusting apparatus of the invention includes: a pump circuit for drawing a current from a semiconductor substrate to adjust a substrate potential; ring oscillators for supplying a periodical signal to the pump circuit and causing the pump circuit to operate; a limiter circuit for detecting a potential of the semiconductor substrate and controlling to switch between operation and non-operation of the ring oscillators in accordance with the detected potential; and a selector circuit for changing the oscillation period of the periodical signal outputted from the ring oscillators in accordance with a signal inputted externally from a chip, the signal determining an operation mode of a circuit formed on the semiconductor substrate.

REFERENCES:
patent: 4336466 (1982-06-01), Sud et al.
patent: 4656369 (1987-04-01), Lou
patent: 4883976 (1989-11-01), Deane

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