Phase locked loop having fast frequency lock steering circuit

Details Phase locked loop having fast frequency lock steering circuit Phase locked loop having fast frequency lock steering circuit

1987-05-04

1988-04-19

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

329124, 375 39, H03D 318

Patent

active

047392843

ABSTRACT:
A steering circuit for use with a phase locked loop (PLL) includes a D-type flip flop having data and clock input terminals and first and second output terminals at which are produced complementary logic output signals, and first and second current sources having inputs respectively coupled to the first and second outputs of the flip flop and outputs connected to an output of the steering circuit. The steering circuit is responsive to error beat note signals generated by the PLL for either sourcing or sinking first and second currents at the output thereof depending upon whether the input signal frequency to the PLL is greater or less than the oscillation frequency of the voltage controlled oscillator (VCO) of the PLL. The output of the steering circuit is connected to the control input terminal of the VCO such that the latter is driven to lock.

REFERENCES:
patent: 4580101 (1986-04-01), Lax
patent: 4605903 (1986-08-01), Ihle

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