Oscillators – Ring oscillators
Patent
1995-08-15
1996-10-08
Mis, David
Oscillators
Ring oscillators
331 34, 331175, 331177R, 327157, H03B 524, H03L 7099
Patent
active
055635539
ABSTRACT:
A method and apparatus for a controlled oscillator which may be incorporated in a phase locked loop is accomplished by including a current controlled reference, a current mirror and a plurality of inverters that form a ring oscillator within the controlled oscillator. The controlled reference provides a current control signal to the current mirror, which, in turn, provides a load control signal to each inverter of the ring oscillator. Each inverter is characterized by a differential load section which includes a pair of load transistors for receiving the load control signal and for providing a current source from the load control signal and a pair of clamping transistors configured to provide a non-linear clamping circuit which limits the voltage range of a differential output. The load transistors are connected in parallel with the clamping transistors to provide a linear differential output. The load control signal dynamically regulates the impedance of the differential load section such that the controlled oscillator may stablely operate at any frequency and be produced without performance variations due to variances in the fabrication process.
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Dallas Semiconductor Corp.
Mis David
SigmaTel Inc.
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