Internal voltage generation circuit having ring oscillator whose

Details Internal voltage generation circuit having ring oscillator whose Internal voltage generation circuit having ring oscillator whose

1999-05-25

2000-05-16

Grimm, Siegfried H.

Oscillators

Ring oscillators

327534, 331177R, H03L 700, G05F 316

Patent

active

060642750

ABSTRACT:
An internal voltage generation circuit down converts an external power supply voltage on the basis of a reference voltage. An oscillator outputs a pulse voltage according to a power supply voltage. A pump circuit generates the internal voltage according to the pulse voltage. A control circuit for the oscillator may include a current mirror amplifier so that when the power supply voltage is reduced the frequency of the pulse voltage becomes higher a corresponding amount and when the power supply voltage is increased the frequency of the pulse voltage becomes lower a corresponding amount.

REFERENCES:
patent: 5097198 (1992-03-01), Holmdahl
patent: 5391979 (1995-02-01), Kajimoto et al.
patent: 5394372 (1995-02-01), Tanaka 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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