Sigma-delta modulator and method thereof
AssigneeRealtek Semiconductor Corp.
InventorKuo-Hsin Chen
Life of this patent
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Abstract
A sigma-delta modulator includes an adder, a filter, a quantizer, and a clock rate controller. The adder receives an input signal and an output signal to generate a summation signal. The filter is coupled to the adder and filters the summation signal to generate a filtered signal. The quantizer is coupled to the filter as well as the adder and quantizes the filtered signal to generate the output signal according to a first clock signal. The clock rate controller is coupled to the quantizer and generates the first clock signal, wherein a frequency of the first clock signal is variable.
Claims19
A sigma-delta modulator, comprising:
- an adder, receiving an input signal and an output signal to generate a summation signal;
- a filter, coupled to the adder, filtering the summation signal to generate a filtered signal;
- a quantizer, coupled to the filter and the adder, quantizing the filtered signal to generate the output signal according to a first clock signal;
- and
- a clock rate controller, coupled to the quantizer, generating the first clock signal, wherein a frequency of the first clock signal is variable.
A method for controlling an output rate of a sigma-delta modulator, comprising:
- receiving an input signal and an output signal to perform an addition operation to generate a summation signal;
- filtering the summation signal to generate a filtered signal;
- generating a first clock signal, wherein a frequency of the first clock signal is variable;
- quantizing the filtered signal to generate the output signal;
- and
- controlling the output of the output signal according to the first clock signal.
A method for controlling an output rate of a sigma-delta modulator, comprising:
- receiving an input signal and an output signal to perform an addition operation to generate a summation signal;
- filtering the summation signal to generate a filtered signal;
- generating a first clock signal, wherein a frequency of the first clock signal is variable;
- and
- quantizing the filtered signal to generate the output signal according to the first clock signal.
Dependencies are inferred from the claim text.