Oscillators – Electrical noise or random wave generator
Patent
1997-08-27
2000-01-11
Mis, David
Oscillators
Electrical noise or random wave generator
331 4, 331178, 327157, 327291, 327294, H03B 104, H03B 500, H03B 508, H03B 2900
Patent
active
060140631
ABSTRACT:
A system of spreading the energy of higher harmonic frequencies in digital circuits to lower the interference to bandpass receivers is disclosed. A set of passive, impedance-regulated circuits, preferably housed in a standard enclosure, comprises a power restoring unit, a modulating signal generator, an internal oscillator and an impedance spreading unit. The circuits are equivalent to passive resonators such as crystal resonators used in standard oscillators. Any existing standard oscillator that uses common crystal resonators can be transformed into a spectrum-spread oscillator by replacing the crystal resonator with the disclosed circuit, whereby a tightly controlled small frequency spreading occurs in the fundamental clock frequency. Further an active oscillator is disclosed wherein a spreading circuit spreads the frequency of the clock signal originally generated by the oscillator based on a sequence of processing the original clock signal. The processing includes the use of a plurality of delay elements based on a certain topology, the comparisons between the clock signal and a set of predefine parameters so as to create a frequency offset. The spreading circuit, without using additional clocking sources, spreads the frequency of the clock signal with respect to the comparisons.
REFERENCES:
patent: 5430392 (1995-07-01), Matejic
patent: 5491458 (1996-02-01), McCune, Jr. et al.
patent: 5781074 (1998-07-01), Nguyen et al.
Liu Dongtai
Safai Mohammed A.
Mis David
Quiet Solutions, Inc.
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