Asynchronous successive approximation register analog-to-digital converter and operating method thereof
First Claim
1. An asynchronous successive approximation register analog-to-digital converter comprising:
- a clock generator for generating a clock signal according to an external clock, a frequency of the clock signal being higher than a frequency of the external clock;
a logic control unit coupled to the clock generator for generating a sample and hold clock according to the clock signal;
a sample and hold circuit coupled to the logic control unit for sampling an analog signal according to the sample and hold clock to obtain and hold a sampling signal;
a digital-to-analog converter coupled to the logic control unit for generating a reference value according to a digital value transmitted from the logic control unit;
a comparator coupled to the sample and hold circuit and the digital-to-analog converter for generating a comparison value according to the sampling signal and the reference value.
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Abstract
An asynchronous successive approximation register analog-to-digital converter includes a clock generator, a logic control unit, a sample and hold circuit, a digital-to-analog converter and a comparator. The clock generator is used to generate a clock signal. The logic control unit is for generating a sample and hold clock according to the clock signal. The sample and hold circuit is for sampling an analog signal according to the sample and hold clock to obtain and hold a sampling signal. The digital-to-analog converter is for generating a reference value according to a digital value transmitted from the logic control unit. The comparator is for generating a comparison value according to the sampling signal and the reference value.
122 Citations
13 Claims
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1. An asynchronous successive approximation register analog-to-digital converter comprising:
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a clock generator for generating a clock signal according to an external clock, a frequency of the clock signal being higher than a frequency of the external clock; a logic control unit coupled to the clock generator for generating a sample and hold clock according to the clock signal; a sample and hold circuit coupled to the logic control unit for sampling an analog signal according to the sample and hold clock to obtain and hold a sampling signal; a digital-to-analog converter coupled to the logic control unit for generating a reference value according to a digital value transmitted from the logic control unit; a comparator coupled to the sample and hold circuit and the digital-to-analog converter for generating a comparison value according to the sampling signal and the reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating an asynchronous successive approximation register analog-to-digital converter, comprising:
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generating a first set of differential voltages; generating a second set of differential voltages according to the first set of differential voltages; generating a third set of differential voltages according to the second set of differential voltages; outputting a first logic signal according to whether two differential voltages of the third set of differential voltages are the same; outputting a select signal according to an external clock and a clock signal; outputting a second logic signal according to the first logic signal, a ground voltage and the select signal; adjusting a frequency of the second logic signal to generate the clock signal according to an external clock, a frequency of the clock signal being higher than a frequency of the external clock; generating a sample and hold clock according to the clock signal; sampling an analog signal according to the sample and hold clock to obtain and hold a sampling signal; generating a reference value according to a digital value; and generating a comparison value according to the sampling signal and the reference value. - View Dependent Claims (12, 13)
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Specification