Voltage control oscillation circuit using CMOS

Details Voltage control oscillation circuit using CMOS Voltage control oscillation circuit using CMOS

1997-07-15

1998-10-06

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331175, 331183, H03B 512

Patent

active

058183060

ABSTRACT:
A voltage control oscillation circuit for a CMOS which is capable of reducing phase noise and power consumption by adapting a voltage amplitude control loop and a common mode feedback circuit to a conventional LC-tank circuit. The circuit includes an LC-tank oscillation unit for outputting an oscillation voltage, an output common mode feedback unit for receiving an output from the LC-tank oscillation unit and eliminating a common mode noise of the output, and a voltage amplitude control unit for controlling a bias current of the LC-tank oscillation unit in accordance with a voltage difference at both ends of an LC-tank oscillation terminal which voltage is applied thereto through the output common mode feedback unit, for thus controlling the amount of an oscillation voltage.

REFERENCES:
patent: 5714911 (1998-02-01), Gilbert
Jan Craninckx et al., "A CMOS 1.8GHz Low-Phase-Noise Voltage-Controlled Oscillator with Prescaler", ISSCC95/Session 15/ Frequency Synthesizers/Paper FA 15.5, 1995 IEEE, pp. 266-267. 1995 IEEE International Solid State Circuits Conference.

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