Tuning voltage generating apparatus of voltage synthesizer type

Details Tuning voltage generating apparatus of voltage synthesizer type Tuning voltage generating apparatus of voltage synthesizer type

1980-12-10

1982-12-21

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

334 15, 455195, H04B 126

Patent

active

043653480

ABSTRACT:
A tuning voltage generating apparatus of a voltage synthesizer type comprises a voltage converter which converts into a reference voltage a voltage level of an input pulse signal having a pulse width corresponding to a frequency to be received and a low-pass filter which converts the pulse signal voltage converted by the voltage converter into a direct current voltage which is withdrawn as a tuning voltage. A reference voltage applied to the voltage converter is generated by dividing a voltage stabilized by a constant voltage diode using a resistor. A resistor voltage divider circuit determines the upper limit of the tuning voltage obtained from the low-pass filter. Two kinds of reference voltages having different levels may be generated as a reference voltage and switched associated with band switching.

REFERENCES:
patent: 4017800 (1977-04-01), Champagne

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