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US 5,491,458 AGranted
Apparatus for spreading the spectrum of a signal and method therefor
OwnerEarl W. McCune, Jr., Narendar Venugopalinventors
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Abstract
An oscillator generates a signal that is applied to one input of a phase shifter circuit. The other input of the phase shifter is connected to a source of a phase modulation signal. In response to the phase modulationsignal, the phase shifter provides a clock signal with a spread spectrum.
Claims5
Apparatus for causing a clock signal of a digital system to have a power density spectrum, comprising:
- an oscillator;
- a source of a periodic phase modulation signal;
- means for phase modulating the output of said oscillator in response to said phase modulation signal, said phase modulation signal causing said means to provide a phase modulated signal with a power density spectrum within a known bandwidth, said power density spectrum being substantially flat.
In the method of spreading the power density spectrum of a clock signal of a digital system, the steps of:
- generating an oscillator signal;
- and
- phase modulating said oscillator signal in response to a phase modulation signal, a result of said modulation being a modulated oscillator signal that has a power density spectrum within a known bandwidth, said power density spectrum being substantially flat.
Dependencies are inferred from the claim text.