Regulated charge pump with low noise on the well of the substrat

Details Regulated charge pump with low noise on the well of the substrat Regulated charge pump with low noise on the well of the substrat

1996-04-02

1997-05-06

Wong, Peter S.

Electric power conversion systems

Current conversion

With voltage multiplication means

307110, H02M 318

Patent

active

056277393

ABSTRACT:
A regulated charge pump is provided to boost an amount of voltage while minimizing the well voltage fluctuation during the operation. The charge pump includes a charge pump core which has a first transistor, a second, a third transistor and an integration circuit. The first transistor has a first current electrode for receiving the first power supply voltage and a second current electrode coupled to the first terminal of the charging capacitor. The second transistor has a first current electrode coupled to a second terminal of the charging capacitor, a control electrode and a second electrode for receiving a second power supply voltage. The second transistor is proportionately conductive during the first predetermined time period. The third transistor has a first current electrode for receiving the first power supply voltage, and a second current electrode coupled to the second terminal of the charging capacitor. The third transistor is conductive during the second predetermined time period. The integration circuit is coupled to the control electrode of the second transistor, for changing the second voltage proportionately in response to an integration of a difference between a proportional voltage and a reference voltage by altering a conductivity of the second transistor.

REFERENCES:
patent: 4106086 (1978-08-01), Holbrook et al.
patent: 5392205 (1995-02-01), Zavaleta
patent: 5397931 (1995-03-01), Bayer
patent: 5493486 (1996-02-01), Connell et al.

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