Voltage controlled oscillator with high speed current switching

Details Voltage controlled oscillator with high speed current switching Voltage controlled oscillator with high speed current switching

H - Electricity

03

K

320/1, 331/41

H03K 3/023 (2006.01) H03K 3/354 (2006.01) H03K 17/04 (2006.01) H03L 7/08 (2006.01)

Patent

CA 1286736

VOLTAGE CONTROLLED OSCILLATOR WITH HIGH SPEED CURRENT SWITCHING ABSTRACT OF THE DISCLOSURE A CMOS voltage controlled oscillator includes a reference capacitor which is charged and discharged by current source and sink output transistors. The output transistors are connected to control transistors in a current mirror fashion with current through the control transistors being maintained at a level proportional to the value of a control input voltage. The control transistors are selectively connected to the output transistors in a current mirror configuration to provide either current source or sink operation. Transmission gates are connected between the gates of the output and control transistors and selectively closed to render the proper output transistor conductive to achieve source or sink operation. MOS capacitors are connected to the control transistors to facilitate rapid switching of the output transistors to enable high frequency operation of the voltage controlled oscillator.

531986

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