Oscillators – Ring oscillators
Patent
1999-01-14
2000-03-07
Mis, David
Oscillators
Ring oscillators
331 34, 331175, 331177R, 327280, 327281, H03B 524, H03L 7099
Patent
active
060345705
ABSTRACT:
A single-gate SCFL delay cell is disclosed for implementation in a common ring oscillator VCO. The delay cell has a differential input stage the output current from which is fixed by two resistors. The differential input stage drives a source follower output stage providing an output capable of driving the differential input of the next stage of the oscillator. The current sources typically used in the source follower output stage have been replaced by voltage-to-current converters. The voltage-to-current converters are comprised of two MESFET devices the gates of which are coupled to a differential control voltage. The source of each of the two devices is coupled to a current source the value of the two current sources being equal. The resistor couples the two sources together such that the voltage drop across the resistor governs how much current is conducted by each of the two devices. The drain of one of the devices is coupled to the supply while the drain of the other device is coupled to the source of the source follower output stage. Thus, the output current of the source follower will be dictated by the difference between the voltage drop across the resistor.
REFERENCES:
patent: 5359301 (1994-10-01), Candage
patent: 5461335 (1995-10-01), Tsuchiya
Mis David
Vitesse Semiconductor Corporation
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