Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1993-06-23
1995-02-28
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 57, 331 74, 327116, 327141, 327175, H03K 301, H03L 706
Patent
active
053941144
ABSTRACT:
Generation of clock waveforms which have a frequency, phase offset, and duty cycle that is relative to a periodic reference signal. The outputs of a voltage controlled ring oscillator are directly applied to drive the inputs of a programmable AND, fixed OR array (PAL) to produce pulses of varied and phase offset and duty cycle. The phase offset has a resolution of one nanosecond. Additionally, the pulses generated can be ORed together within the PAL to produce clock waveforms that are multiples of the input frequency.
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Ron Wilson, Creative Use of PLLs Solves Clock Skew Problem, Sep. 1, 1990, Computer Design, pp. 40-42.
Deog-Kyoon Jeong et al., Design of PLL-Based Clock Generation Circuits, Apr. 1987, Journal of Solid State Circuits, vol. 22, pp. 255-261.
Mis David
National Semiconductor Corporation
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