Frequency synthesizer allowing rapid frequency switching

Details Frequency synthesizer allowing rapid frequency switching Frequency synthesizer allowing rapid frequency switching

1990-07-30

1991-07-30

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 16, 331 17, 331 25, 331 36C, 455183, H03L 7085, H03L 718

Patent

active

050362950

ABSTRACT:
A frequency synthesizer is designed to modify voltage value data read out of a memory in accordance with the output voltage of a filter, and apply a d.c. voltage corresponding to the modified data to a second variable-capacitance diode at the control input of a VCO, thereby allowing the VCO frequency switching without imposing a significant fluctuation of the application voltage to a first variable-capacitance diode and accomplishing a short channel switching time and stable operation against temperature fluctuation. The device is further designed to supply a voltage setup value read out of the memory to the second variable-capacitance diode thereby to reduce the frequency matching time at channel switching, and to determine such another voltage setup value as to reduce the time of phase matching based on the trend of change in the filter output voltage and supply the value to the second variable-capacitance diode.

REFERENCES:
patent: 4511858 (1985-04-01), Charavit et al.
patent: 4562410 (1985-12-01), O'Rourke

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