Charge pump circuit

Details Charge pump circuit Charge pump circuit

1991-10-17

1993-08-24

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

With voltage multiplication means

307510, 307511, 328155, 323315, H02M 725, H03L 700

Patent

active

052394557

ABSTRACT:
A charge pump circuit for a frequency/phase comparator in a phase locked loop oscillator arrangement, in which current sources utilizing only npn transistors provide currents of equal magnitude but of opposite sense to an input of an operational amplifier, the output of this amplifier charge-pumping a capacitor to control the frequency of oscillation of an oscillator. The use of npn transistors enables higher current levels and higher speed switching compared to circuits including pnp transistors.

REFERENCES:
patent: 4636748 (1987-01-01), Latham, II
patent: 4959618 (1990-09-01), Shier

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