Voltage-controlled oscillator

Details Voltage-controlled oscillator Voltage-controlled oscillator

1997-07-31

1998-10-13

Pascal, Robert

Oscillators

Ring oscillators

331175, 327266, H03B 502

Patent

active

058218238

ABSTRACT:
A voltage-controlled oscillator (VCO) includes a plurality of differential amplifiers which are ring-connected. Each amplifier includes two FETs, the sources of which are coupled. The coupled sources of each amplifier are connected to series-connected FETs which is part of a current mirror circuit. The series-connected FETs decrease transconductance of (i.e., increase impedance against) fluctuations in a power supply voltage, so that fluctuations in current flowing in the amplifiers are lessened. Thus, power-supply rejection ratio of the VCO increases and fluctuations in the VCO frequency are lessened.

REFERENCES:
patent: 5412349 (1995-05-01), Young et al.

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