Phase locked loop sweep frequency synthesizer

Details Phase locked loop sweep frequency synthesizer Phase locked loop sweep frequency synthesizer

1988-10-17

1990-06-05

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331178, H03B 2300, H03L 712

Patent

active

049317490

ABSTRACT:
A frequency synthesizer is provided in which the output is a truly continuous sweep of frequency, not a staircase of spot frequencies. A programmable frequency divider PD is connected to the output of a voltage-controlled oscillator (VCO) to divide the VCO output by a variable integer N. At each VCO output cycle, the integer N is incremented (or decremented). The output of a phase comparator PC, which compares the divider output with a fixed reference frequency, is connected via an integrator (10) to the VCO frequency control input (2). A constant phase error produces a ramp rise of VCO frequency.

REFERENCES:
patent: 3364437 (1968-01-01), Loposer et al.
patent: 3962653 (1976-06-01), Basset
patent: 4380743 (1983-04-01), Underhill et al.

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