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

***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE***

Description:...

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Voltage controlled oscillator with high speed current switching

Details

Inventors: Ouyang, Kenneth W.; Marmet, Melvin;
Assignee: Western Digital Corporation (Irvine, CA)
Primary Examiner: Grimm; Siegfried H.
Assistant Examiner:
Attorney, Agent or Firm: Spensley Horn Jubas & Lubitz

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.

DETAILED DESCRIPTION The present invention is directed to a voltage controlled oscillator having a high switching speed.
The voltage controlled oscillator of the invention is capable of running at 10 MHz or above and is thus suitable for use in the phase-locked loop of a hard disk data separator.
The circuit includes a reference capacitor which is charged and discharged by means of output transistors operating as a current source or current sink.
The output transistors are connected to control transistors in a current mirror configuration by means of transmission gates which are switched to control operation as a current source or current sink.
FET capacitors are connected to the gates of the current mirror transistors so that the output transistors can be rapidly switched.
This assures a uniform charging and discharging rate for the capacitor which in turn assures precise oscillator operation.

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