Delta-sigma modulation analog to digital converter
First Claim
1. A delta-sigma modulation analog to digital converter for converting an analog input signal to a digital output signal, comprising:
- input means for receiving the analog input signal;
clock generator means for generating a very high frequency clock signal with first and second phases;
first switching circuit means, coupled to the input means, for modulating the analog input signal with the very high frequency clock signal;
integration means, coupled to the first switching circuit means, for integrating the modulated input signal, the integration means also generating a noise signal;
second switching circuit means, coupled to the integration means, both for demodulating the integrated modulated input signal and modulating the noise signal with the very high frequency clock signal;
quantizer means, coupled to the second switching circuit means and responsive to the demodulated integrated modulated input signal and the modulated noise signal, for generating the digital output signal, the digital output signal including a separable portion corresponding to the modulated noise signal; and
feedback circuit means, coupled between the quantizer means and the integration means, for both generating a feedback signal corresponding to the digital output signal and feeding the feedback signal to the integration means.
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Abstract
A delta-sigma modulation analog to digital converter for converting an analog input signal to a digital output signal. The converter includes an input circuit for receiving the analog input signal, a clock generator for generating a very high frequency clock signal with first and second phases, a first switching circuit coupled to the input circuit for modulating the analog input signal with the very high frequency clock signal, an integration circuit coupled to the first switching circuit for integrating the modulated input signal and generating a noise signal, a second switching circuit coupled to the integration circuit both for demodulating the integrated modulated input signal and modulating the noise signal with the very high frequency clock signal, a quantizing circuit coupled to the second switching circuit and responsive to the demodulated input signal and the modulated noise signal for generating the digital output signal including a separable portion corresponding to the modulated noise signal and a feedback circuit coupled between the quantizing circuit and the integration circuit both for generating a feedback signal corresponding to the digital output signal and feeding the feedback signal to the integration circuit.
83 Citations
16 Claims
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1. A delta-sigma modulation analog to digital converter for converting an analog input signal to a digital output signal, comprising:
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input means for receiving the analog input signal; clock generator means for generating a very high frequency clock signal with first and second phases; first switching circuit means, coupled to the input means, for modulating the analog input signal with the very high frequency clock signal; integration means, coupled to the first switching circuit means, for integrating the modulated input signal, the integration means also generating a noise signal; second switching circuit means, coupled to the integration means, both for demodulating the integrated modulated input signal and modulating the noise signal with the very high frequency clock signal; quantizer means, coupled to the second switching circuit means and responsive to the demodulated integrated modulated input signal and the modulated noise signal, for generating the digital output signal, the digital output signal including a separable portion corresponding to the modulated noise signal; and feedback circuit means, coupled between the quantizer means and the integration means, for both generating a feedback signal corresponding to the digital output signal and feeding the feedback signal to the integration means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification