Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural a.f.s. for a single oscillator
Patent
1987-11-06
1988-12-20
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural a.f.s. for a single oscillator
331 16, 331 25, H03L 700
Patent
active
047927682
ABSTRACT:
Signal generating apparatus including a phase-locked loop (PLL) utilizing a voltage-controlled oscillator (VCO) and a frequency-locked loop (FLL) to generate an output signal whose frequency jumps from one value to another in a selectable sequence. The signal generator further includes a delay line discriminator to provide an error signal to compensate for FM noise in the VCO. The frequency-locked loop is implemented by utilizing the FM error signal from the delay line discriminator to stabilize the center frequency of the VCO. The inherent wide bandwidth of the FLL provides a fast settling time when the loop is switched to a new frequency. In a learn mode, the gain parameters of the loop are determined and stored each of a plurality of frequencies. The gain parameters and a corresponding pretune signal for each selected frequencies are the applied to the FLL in a selectable sequence to provide a fast-switching signal generator.
REFERENCES:
patent: 3928813 (1975-12-01), Kingsford-Smith
patent: 4568888 (1986-02-01), Kimura et al.
Fried Raymond L.
Hoover David M.
Hewlett--Packard Company
LaRoche Eugene R.
Murray Leslie G.
Pascal Robert J.
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