Method and apparatus for standby recovery in a phase locked loop

Details Method and apparatus for standby recovery in a phase locked loop Method and apparatus for standby recovery in a phase locked loop

1993-04-12

1994-08-16

Nelli, Raymond A.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 14, 331 1A, H03L 700

Patent

active

053392787

ABSTRACT:
A phase locked loop (20) includes a standby control circuit (30) and recovers from standby with minimum lock time. A reference counter (21), a loop counter portion (22, 23) and a phase detector (24) are disabled in response to an activation of a standby signal. Both the reference counter (21) and the loop counter portion (22, 23) are enabled in response to a deactivation of the standby signal. A voltage controlled oscillator (VCO) (26) output signal is decoupled from an input of the loop counter portion (22, 23) in response to an activation of a loop counter output signal. The VCO output signal is next recoupled to the input of the loop counter portion (22, 23) in response to an activation of a reference counter output signal. Finally, the phase detector (24) is enabled. In one embodiment, the loop counter portion (22, 23) includes a prescaler (22) which does not have a separate reset input, and a separate loop counter (23).

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