Voltage converter for a frequency synthesizer

Details Voltage converter for a frequency synthesizer Voltage converter for a frequency synthesizer

1981-04-06

1984-11-20

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 16, 331 17, 331 25, 331 36C, H03L 718

Patent

active

044841531

ABSTRACT:
In a frequency synthesizer phase locked loop including a reference oscillator, a variable reference divider (.div.M), a sample and hold phase detector, a loop filter, a voltage controlled oscillator and a variable divider (.div.N), a voltage converter for controlling the voltage of a control input to the voltage controlled oscillator is disclosed. In the preferred embodiment, the voltage converter has its input connected to the output of a first reference divider in the variable reference divider (.div.M) and its output connected to a control input (varactor diode) of the voltage controlled oscillator. The voltage converter clamps the divider reference signal from the first reference divider and provides a negative voltage level output to bias the varactor diode of the voltage controlled oscillator. Thus, the tuning range of the frequency synthesizer is increased.

REFERENCES:
patent: 3621451 (1971-11-01), Yokoyama et al.
patent: 3882403 (1975-05-01), Gerken
patent: 3959737 (1976-05-01), Tanis
patent: 3983506 (1976-09-01), Rettinger, Jr. et al.

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