Ring oscillator having accelerated charging and discharging of c

Details Ring oscillator having accelerated charging and discharging of c Ring oscillator having accelerated charging and discharging of c

1995-07-31

1996-10-15

Grimm, Siegfried H.

Oscillators

Ring oscillators

327237, 327251, 327288, H03B 524, H03H 1126

Patent

active

055658172

ABSTRACT:
In a ring oscillator, a delay unit includes an input stage having a first and a second input port and a first and a second differential output port. At least two delay units are coupled together so as to form the ring oscillator. The delay unit further includes a first capacitor coupled to the first differential output port of each one of the delay units and a second capacitor is coupled to the second differential output port of the delay unit. A switching accelerator is coupled to the first and second capacitors so as to reduce the time it takes to switch between charged and discharged states for the capacitors. In accordance with another aspect of the invention, a method for providing a delay in a delay unit, the delay of the delay unit being dependent, at least in part, upon the time to charge and discharge a capacitor coupled in the delay unit, the method including the steps of: providing a current signal to the delay unit in a manner so as to cause the capacitor to enter a charged state from a prior discharged state; and accelerating the switching between the discharged and charged states so as to reduce the time it takes to switch between the discharged and charged states for the capacitor.

REFERENCES:
patent: 5059924 (1991-10-01), JenningsCheck
patent: 5298870 (1994-03-01), Cytera et al.
patent: 5365204 (1994-11-01), Angiulli et al.
patent: 5416446 (1995-05-01), Holler, Jr. et al.
patent: 5479129 (1995-12-01), Fernandez et al.
A Variable Delay Line PLL for CPU-Coprocessor Synchronization By: Mark G. Johnson and Edwin Hudson, IEEE Journal of Solid-State Circuits, vol. 23, Oct. 1988.
A High-Frequency Integrated CMOS Phase-Locked Loop By: Kurt Matthew Ware, Jun. 1989 Thesis submitted at Massachusetts Institute of Technology.

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