High frequency CMOS VCO with gain constant and duty cycle compen

Details High frequency CMOS VCO with gain constant and duty cycle compen High frequency CMOS VCO with gain constant and duty cycle compen

1991-01-17

1991-10-29

Pascal, Robert J.

Oscillators

Ring oscillators

331108B, H03B 100

Patent

active

050619071

ABSTRACT:
The present invention provides a high frequency CMOS voltage controlled oscillator circuit with gain constant and duty cycle compensation. The voltage controlled oscillator circuit includes a multi-stage ring oscillator that includes a plurality of series-connected inverter stages comprising N-channel and P-channel transistors. The ring oscillator responds to a control current signal for controlling the frequency of oscillation of the ring oscillator. A voltage-to-current converter converts a tuning voltage input signal to a corresponding output current signal that is independent of the channel strength of the N-channel and P-channel transistors. Process compensation circuitry responds to the tuning voltage input signal to provide a current dump output signal corresponding to the channel strength of the P-channel and N-channel transistors. Trip-point compensation circuit provides a net ring current signal as the current control signal to the ring oscillator. The net ring current signal represents the difference between the output current signal and the current dump output signal and responds to the balance between the output buffer trip point and a ring oscillator dummy stage.

REFERENCES:
patent: 4876519 (1989-10-01), Davis et al.
Ware et al., "A 200 MHz CMOS Phase-Locked Loop with Dual Phase Detectors", IEEE Transactions on Solid State Circuits, May 10, 1989.
Yousefi, "14 MHz-100 MHz CMOS L Based Frequency Synthesizer IC".

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