Regulated complementary charge pump circuit

Electric power conversion systems – Current conversion – With voltage multiplication means

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H02M 318, H02M 700

Patent

active

055923704

ABSTRACT:
A charge pump circuit contains a first switch pass gate, a second switch pass gate, a high node regulator, and a low node regulator. The first switch pass gate couples a high node to a charge pump output when an up control signal is active, and the second switch pass gate couples a low node to the charge pump output when a down control signal is active. The high node regulator receives the charge pump output and a source voltage for the charge pump circuit, and generates a high node voltage at the high node such that the high node voltage is regulated to a voltage above a predetermined margin of the charge pump output. The low node regulator is coupled to ground, and receives the charge pump output to generate a low node voltage at the low node that is regulated to a voltage below a predetermined margin of the charge pump output. The charge pump circuit has application for use in a phase lock loop.

REFERENCES:
patent: 4752699 (1988-06-01), Cranford, Jr. et al.
patent: 4857866 (1989-08-01), Tateishi
patent: 5239455 (1993-08-01), Fobbester et al.
patent: 5334951 (1994-08-01), Hogeboom
patent: 5375148 (1994-12-01), Parker et al.
patent: 5394320 (1995-02-01), Blodgett
patent: 5410465 (1995-04-01), Tan

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