Current starved inverter voltage controlled oscillator

Details Current starved inverter voltage controlled oscillator Current starved inverter voltage controlled oscillator

1992-11-23

1994-09-20

Lee, Benny T.

Oscillators

Ring oscillators

331 17, 331 1A, 331 34, 331177R, 331175, 331179, H03B 500, H03L 7099

Patent

active

053493117

ABSTRACT:
A voltage controlled oscillator (VCO) operating as a variable length, variable delay, ring oscillator having a current starved inverter and an anti high-gain circuit for each stage. A VCO feedback signal is compared with a reference frequency obtained, for example, from a system crystal oscillator. A phase and frequency detector monitors these two input signals and issues "up" or "down" commands to a digital counter. This digital counter delivers select signals via a decoder and also drives a Digital to Analog Converter ("DAC"). The digital select signal from the counter chooses an operational stage from the multi-stage, tandem-connected VCO. A broadband operation for the VCO is achieved by overlapping the individual frequency ranges associated with each of the individual stages. The DAC moves the operation along each selected frequency range associated with a selected stage until a system lock between the VCO output and the crystal references is achieved.

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"MOS Oscillators with Multi-Decade Tuning Range and Gigahertz Maximum Speed", by M. Banu IEEE JL. of Solid State Circutis Dec. 1988 vol. 23 #6 p. 1386.
"A Variable Delay Line PLC for CPU-Coprocessor Synchronization", by M. Johnson and E. Hudson IEEE JL of Solid State Circuits Oct. 1988 pp. 1218 -1223.
"Design of PLC Based Clock Circuits" by D. Jeong et al. IEEE JL. of Solid State Circuits vol. SC-22 #2 (Apr. 1987) pp. 255-261.

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