Low order charge-pump filter

Details Low order charge-pump filter Low order charge-pump filter

1985-02-01

1987-05-26

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328127, 328133, 307511, 331 17, 331 25, G01R 2500, H03L 708

Patent

active

046689184

ABSTRACT:
The present invention discloses a low order charge-pump filter operable with a single variable current source. The integrating capacitor of the charge-pump is connected in an H-bridge switching configuration with four switches that are operable to control the current source to supply current to a first node of the capacitor or to a second node of the capacitor or to bypass a capacitor, depending on the state of operation of the charge-pump. The charge-pump filter disclosed is particularly useful for providing the low order response for a phase detector in a phase-locked loop.

REFERENCES:
patent: 3857108 (1974-12-01), Kanow
patent: 4151473 (1979-04-01), Coleman et al.
patent: 4166984 (1979-09-01), Jenkins
patent: 4238740 (1980-12-01), Crue
patent: 4450410 (1984-05-01), Kliger et al.
patent: 4484089 (1984-11-01), Viswanathan
patent: 4506233 (1985-03-01), Englund
patent: 4523150 (1985-06-01), Hogeboom
patent: 4546330 (1985-10-01), Okada

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