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Substrate bias generation circuit

Image Number 3 for United States Patent #4388537.

Disclosed is a substrate bias generator circuit which comprises an oscillator circuit, a driving circuit producing a rectangular-wave signal in accordance with an oscillation output signal from the oscillator circuit, and a charge pump circuit pumping electric charges into a substrate in accordance with the rectangular-wave output signal from the driving circuit. The oscillator circuit is a voltage-controlled oscillator circuit whose oscillation frequency is controlled in accordance with a substrate bias voltage from the charge pump circuit.

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