Oscillators – Ring oscillators
Patent
1997-11-18
1999-08-10
Kinkead, Arnold
Oscillators
Ring oscillators
331177R, 331185, 331 34, 331175, 331183, 327261, H03B 504
Patent
active
059364769
ABSTRACT:
A CMOS super high speed voltage controlled oscillator (VCO) circuit that operates at frequencies of at least 3 GHz. The VCO circuit of the present invention includes a replica circuit, a first VCO cell coupled to the replica circuit, and a second VCO cell coupled to the first VCO cell and the replica circuit. A VCO output for transmitting a VCO output signal is also included. A first current source is coupled to the first VCO cell to transmit a first current from the power supply to the first VCO cell. A second current source is coupled to the second VCO cell to transmit a second current from the power supply to the second VCO cell. The first VCO cell and the second VCO cell each have respective first and second source follower load transistors coupled to the replica circuit. In addition, the first and second VCO cells, the first and second current sources, and the replica circuit are all fabricated using n-channel MOS transistors. Consequently, the VCO circuit of the present invention reliably oscillates at 3 GHz or above and produces a VCO output having a frequency of 3 GHz or above.
REFERENCES:
patent: 5477182 (1995-12-01), Huizer
patent: 5748048 (1998-05-01), Moyal
Kinkead Arnold
VLSI Technology Inc.
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