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US 4,301,422 AGranted
Frequency synthesizer
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHiroshi Minakuchi
Life of this patent
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Abstract
A first frequency-to-voltage converter develops a first voltage representative of a standard frequency. A variable frequency source is provided to furnish a pulse sequence with constant-duration but variable repetition pulses. A frequency-to-voltage converter receives the pulse sequence to develop a second voltage representative of a total pulse energy generated in the pulse sequence per unit time. The deviation of the second voltage from the first voltage is detected by a comparator to control the variable frequency source to derive a desired frequency.
Claims9
A variable frequency synthesizer comprising:
- a binary counter connected to a source of reference frequency signal for generating a first pulse with a duration corresponding to an integral multiple of the period of said reference frequency signal in response to a predetermined number of oscillations of said reference frequency signal;
- a variable frequency oscillator;
- a monostable device having a first input terminal connected to the output of said variable frequency oscillator and a second input terminal connected to said reference frequency source for generating a second pulse in response to each oscillation of the output signal from said variable frequency oscillator with a duration variable as a function of the period of said reference frequency signal;
- a differential integrator connected to be responsive to said first and second pulses for generating a voltage signal representative of the difference in duty cycle between said first and second pulses for application to the input of said variable frequency oscillator;
- and
- a variable resistance element having a manually adjustable, continuously variable resistance for varying said voltage signal, whereby the output signal of said oscillator is continuously variable as a function of the resistance of said variable resistance element.
3 more elements
Dependencies are inferred from the claim text.