Fast frequency switching synthesizer

Details Fast frequency switching synthesizer Fast frequency switching synthesizer

1997-06-05

1999-02-16

Mottola, Steven

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 327159, 327106, 375376, H03L 718

Patent

active

058724877

ABSTRACT:
A frequency synthesizer that can switch an output frequency fast and generates little spurious output is provided. This frequency synthesizer comprises a phase locked loop including a voltage-controlled oscillator, a high frequency divider, a phase frequency comparator and a low-pass filter. The divisor controller circuit supplies a divisor that varies cyclically to the high frequency divider for a fractional dividing operation. When switching the output frequency, a passing bandwidth of the low-pass filter is enlarged to widen a loop bandwidth of the phase locking loop for fast switching. After switching, the passing bandwidth of the low-pass filter is reduced to narrow the loop bandwidth for reduction of a spurious output, at the timing when a predetermined period has passed for the switched output frequency to stabilize substantially.

REFERENCES:
patent: 4912432 (1990-03-01), Galani et al.
patent: 5420545 (1995-05-01), Davis et al.
patent: 5694089 (1997-12-01), Adachi et al.

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