Differential charge pump for a phase locked loop

Details Differential charge pump for a phase locked loop Differential charge pump for a phase locked loop

1989-02-16

1990-09-25

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328133, 307511, 307516, 307264, 331 1A, 331 25, H03D 1300, H03K 906, H03K 513

Patent

active

049596187

ABSTRACT:
A differential charge pump for use in a phase locked loop. The charge pump generates a voltage difference signal proportional to the duration of first and second pulse trains provided by a phase comparator. The charge pump includes a differential amplifier for generating the difference signal, first and second RC filter networks connected between the noninverting and inverting terminals of the differential amplifier and a reference node, respectively. Parallel, all-NPN switching networks apply charging current pulses to the first RC filter network in response to the first pulse train and they apply charging current pulses to the second RC filter network in response to the second pulse train.

REFERENCES:
patent: 4207539 (1980-06-01), Minakuchi
patent: 4485353 (1984-11-01), Fang et al.
patent: 4485354 (1984-11-01), Shanley, II et al.
patent: 4527277 (1985-07-01), Kosaka et al.
patent: 4546330 (1985-10-01), Okada
patent: 4636748 (1987-01-01), Latham, II
patent: 4686481 (1987-08-01), Adams
patent: 4743857 (1988-05-01), Childers
patent: 4772793 (1988-09-01), Lakson et al.

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