Signal controlled phase shifter

Details Signal controlled phase shifter Signal controlled phase shifter

1992-12-23

1996-05-28

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

327241, 327263, 327244, 327261, 327284, 327286, 327291, 327293, H03H 1116, H03H 1126, H03K 300

Patent

active

055214991

ABSTRACT:
A clock is phase shifted by an amount controlled by the value of a control signal by establishing at least several discrete delay times to be imposed on the clock. The control signal value controls selection of the imposed discrete delay time. An analog-to-digital converter of a phase locked loop responds to intelligence representing variable phase bits and the selected phase shifted clock to control the signal value. The selected replica is derived by at least several cascaded substantially equal time delay units. In one embodiment, a multiplexer responds to the clock, and the signal value, which is Gray coded, to control connections from one of the delay units to an output terminal. In another embodiment, the number of cascaded delay units interposed between the clock and an output terminal is controlled by the signal value.

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