Sigma delta modulator and quantizer and quantization method thereof
First Claim
1. A quantizer of a sigma-delta modulator, comprising:
- a pulse width modulator configured to receive an input signal and perform a pulse width modulation on the input signal according to at least one sawtooth wave and at least one reference voltage to generate a pulse width modulation signal;
a converter connected to an output of the pulse width modulator and configured to digitize the pulse width modulation signal to generate an output digital value; and
a voltage level tracing device connected to an output of the converter and configured to receive the output digital value to generate a reference voltage adjustment value, the reference voltage adjustment value being transmitted to the pulse width modulator to adjust the reference voltage, so as to change a next corresponding voltage level of the sawtooth wave to trace the input signal.
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Abstract
A quantizer of a sigma-delta modulator includes a pulse width modulator (PWM), a converter and a voltage level tracing device. The PWM receives an input signal, and generates a PWM signal according to one or more sawtooth waves and one or more reference voltages. The converter is connected to the output of the PWM and digitizes the PWM signal to generate an output digital value. The voltage level tracing device is connected to the output of the converter, and receives the output digital value to generate a reference voltage adjustment value. The reference voltage adjustment value is transmitted to the PWM for adjusting the reference voltage, so as to change the next corresponding voltage level of the sawtooth wave to track the input signal.
9 Citations
20 Claims
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1. A quantizer of a sigma-delta modulator, comprising:
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a pulse width modulator configured to receive an input signal and perform a pulse width modulation on the input signal according to at least one sawtooth wave and at least one reference voltage to generate a pulse width modulation signal; a converter connected to an output of the pulse width modulator and configured to digitize the pulse width modulation signal to generate an output digital value; and a voltage level tracing device connected to an output of the converter and configured to receive the output digital value to generate a reference voltage adjustment value, the reference voltage adjustment value being transmitted to the pulse width modulator to adjust the reference voltage, so as to change a next corresponding voltage level of the sawtooth wave to trace the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A quantization method for a sigma-delta modulator, comprising:
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receiving an input signal; performing pulse width modulation on the input signal according to at least one sawtooth wave and at least one reference voltage to generate a pulse width modulation signal; performing time-to-digital conversion to digitize the pulse width modulation signal so as to generate an output digital value; and generating a reference voltage adjustment value according to the output digital value to adjust the reference voltage, so as to change a next corresponding voltage level of the sawtooth wave to trace the input signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification