Apparatus and method for locking a PLL onto a selected offset fr

Details Apparatus and method for locking a PLL onto a selected offset fr Apparatus and method for locking a PLL onto a selected offset fr

1979-04-05

1981-01-20

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 25, 331 31, 331 22, H03L 712

Patent

active

042465460

ABSTRACT:
The output of a VCO, a referenced frequency signal and an offset frequency signal are mixed to provide a control signal for the VCO and a double offset frequency signal which is mixed with an output of the offset frequency source to provide a DC component having a positive polarity if the signals are inphase and the VCO is locked on one sideband and a negative polarity if the signals are out of phase and the VCO is locked on the other sideband. A sweep signal is activated and applied to the VCO in response to the VCO being locked onto the wrong sideband.

REFERENCES:
patent: 3852682 (1974-12-01), Dawe et al.
patent: 4009448 (1977-02-01), Hopwood et al.
patent: 4077016 (1978-02-01), Sanders et al.

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