Voltage controlled r-c oscillator and phase locked loop

Details Voltage controlled r-c oscillator and phase locked loop Voltage controlled r-c oscillator and phase locked loop

1989-02-23

1990-04-24

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 34, 331 57, 331135, 331143, 331177R, H03B 520, H03K 303, H03K 706, H03L 708

Patent

active

049203223

ABSTRACT:
A voltage controlled oscillator (VCO) comprises the series arrangement of two signal inverters whose outputs are coupled to the input of the first signal inverter through a feedback loop, and a control circuit including a series arrangement of two diodes arranged in the same direction, whose interconnected electrodes are coupled to the input of the first inverter. The other electrodes of the diodes form inputs for two control voltages with which the frequency of the VCO can be varied over a continuous range. The VCO is used in a phase locked loop which includes a phase detector for generating an error signal representative of a phase difference between a reference signal and a signal taken from the VCO, and a loop filter for producing a control signal from the error signal. The phase detector is arranged as an EXOR gate with a first input for the reference signal voltage and a second input for the output voltage of the VCO. The phase detector has an output which is connected to one of the control inputs of the VCO through a first passive low-pass filter, and to the other control input of the VCO through an EXOR gate, operating as a logic signal inverter, and a subsequent second passive low-pass filter, corresponding with the first filter.

REFERENCES:
patent: 4146849 (1979-03-01), Satou
Dean et al., RCA Application Note ICAN-6267, Mar. 1971, pp. 353-360.
Rice, "XOR Gate Controls Oscillator Frequency", EDN, Apr. 14, 1982, p. 196.

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