CLOCK NOISE CANCELING CIRCUIT
First Claim
1. A clock noise canceling circuit comprising:
- a coupler for extracting a signal from a clock signal;
a filter for selecting a harmonic component of a preset frequency in the extraction signal from the coupler;
a phase shifter for phase inverting the harmonic component of the preset frequency from the filter;
an automatic gain control amplifier for amplifying the phase-inverted harmonic component from the phase shifter;
a combiner for combining the amplified component from the phase shifter with the clock signal to eliminate the harmonic component of the preset frequency from the clock signal;
a power detector for detecting a power level of the harmonic component of the preset frequency in an output signal of the combiner; and
a controller for controlling gain of the automatic gain control amplifier based on the power level of the harmonic component detected by the power detector, thereby canceling noises.
1 Assignment
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Accused Products
Abstract
In a clock noise canceling circuit, a coupler extracts a signal from a clock signal. A filter selects a harmonic component of a preset frequency in the extraction signal from the coupler. A phase shifter phase inverts the harmonic component of the preset frequency from the filter. An AGC amplifier amplifies the phase-inverted harmonic component from the phase shifter. Also, a combiner combines the amplified component from the phase shifter with the clock signal to eliminate the harmonic component of the preset frequency from the clock signal. A power detector detects a power level of the harmonic component of the preset frequency in an output signal of the combiner. Additionally, a controller controls gain of the automatic gain control amplifier based on the power level of the harmonic component detected by the power detector, thereby canceling noises.
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Citations
6 Claims
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1. A clock noise canceling circuit comprising:
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a coupler for extracting a signal from a clock signal; a filter for selecting a harmonic component of a preset frequency in the extraction signal from the coupler; a phase shifter for phase inverting the harmonic component of the preset frequency from the filter; an automatic gain control amplifier for amplifying the phase-inverted harmonic component from the phase shifter; a combiner for combining the amplified component from the phase shifter with the clock signal to eliminate the harmonic component of the preset frequency from the clock signal; a power detector for detecting a power level of the harmonic component of the preset frequency in an output signal of the combiner; and a controller for controlling gain of the automatic gain control amplifier based on the power level of the harmonic component detected by the power detector, thereby canceling noises. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification