VCO and buffer having noise filter on power supply line

Details VCO and buffer having noise filter on power supply line VCO and buffer having noise filter on power supply line

1993-12-09

1995-01-03

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331177V, 331185, H03B 512

Patent

active

053790030

ABSTRACT:
A voltage-controlled oscillation circuit includes a power supply terminal for supplying power to an oscillation stage, a buffer stage, and an output matching stage. Connected between the power supply terminal and ground is a high frequency bypass capacitor for bypassing electrical noise superimposed on the power supply to the side of ground, a voltage feedback resistor is connected in series in a power supply line connected to the power supply terminal, the high frequency bypass capacitor and the voltage feedback resistor constitute a low-pass filter, and the capacitance value of the high frequency bypass capacitor and the resistance value of the voltage feedback resistor are determined so that the cut off frequency of the low-pass filter is at most the frequency f0 of noise.

REFERENCES:
patent: 4709409 (1987-11-01), Ma et al.

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