Wide-range variable delay and ring oscillator

Details Wide-range variable delay and ring oscillator Wide-range variable delay and ring oscillator

1994-06-28

1995-07-18

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327395, 327396, 331 57, F03K 514, H03B 520

Patent

active

054345251

ABSTRACT:
A variable delay line having a string of "slow" logic inverters and an equal number of "fast" inverters with inputs connected to corresponding "slow" inverter inputs. Transmission gates, coupling the "fast" inverter outputs to corresponding "slow" inverter outputs, vary the amount of current from the "fast" inverters added to the output current of the corresponding "slow" inverters. Maximum delay occurs when substantially no current from the "fast" inverter is added to the "slow" inverter output current and minimum delay occurs when substantially all the current from the "fast" inverter is added to the "slow" inverter output current. The variable delay line may be configured into a variable frequency ring oscillator, useful in phase-locked-loops or the like.

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patent: 5075569 (1991-12-01), Branson
patent: 5192886 (1993-03-01), Wetlaufer
patent: 5245231 (1993-09-01), Kocis et al.

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