Phase detector apparatus including charge pump means

Details Phase detector apparatus including charge pump means Phase detector apparatus including charge pump means

1985-02-01

1987-08-11

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328155, 307511, 307516, 307262, H03D 1300, H03K 906, H03K 513

Patent

active

046864814

ABSTRACT:
An improved phase detector apparatus which includes a charge pump. The charge pump includes a first integrating node and a second integrating node. The first and second integrating nodes generate node voltages which ramp downward and upward during a given period of a reference signal. When a signal is received to which a reference signal is to be locked on, the integrating sequence of the first and second nodes is altered so that the differential voltage across the nodes indicates a difference in phase between the reference signal and the second signal. A filter is connected between the output signal and the first integrating node, while the second integrating node is referenced to a DC bias level and returns to that level at the beginning and end of each cycle. The charge pump apparatus is driven by variable current sources which give the apparatus a variable frequency response. The frequency response is variable over a very wide range by the inclusion of multiple banks of variable current sources which can be switched in and out for driving the charge pump apparatus as desired.

REFERENCES:
patent: 3944938 (1976-03-01), Browant
patent: 3968446 (1976-07-01), Thiebout
patent: 4127824 (1978-11-01), Bennett, Jr.
patent: 4358736 (1982-11-01), De Boer
patent: 4523150 (1985-06-01), Hogeboom
patent: 4532442 (1985-07-01), Black

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