Internal voltage generation circuit that down-converts external

Details Internal voltage generation circuit that down-converts external Internal voltage generation circuit that down-converts external

1997-01-09

1999-11-09

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323280, 327541, 327543, G05F 316

Patent

active

059821620

ABSTRACT:
An internal voltage-down power supply circuit includes a voltage-down circuit, a comparator circuit (current mirror amplifier), and a current source control circuit. The comparator circuit (current mirror amplifier) includes a current source (NMOS). When an external power supply voltage is increased, the current source control circuit reduces a control voltage applied to the gate of the current source to reduce the current from the current source. When the temperature becomes lower, the current source control circuit reduces the control voltage applied to the gate of the current source to reduce the current from the current source. Therefore, the closed loop gain of the internal voltage-down power supply circuit can be suppressed from increasing, and unnecessary oscillation of the internal power supply voltage can be prevented even when the external power supply voltage is increased and the temperature during operation is low.

REFERENCES:
patent: 5097198 (1992-03-01), Holmdahl
patent: 5391979 (1995-02-01), Kajimoto et al.
patent: 5557193 (1996-09-01), Kajimoto
patent: 5689460 (1997-11-01), Ooishi
Horiguchi, Masashi, et al: "A Tunable CMOS-DRAM Voltage Limiter with Stabilized Feedback Amplifier", IEEE Journal of Solid-State Circuits, vol. 25, No. 5, Oct. 1990, pp. 1129-1134.

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