A/D converter and duty control method of sampling clock
AssigneeNEC Electronics Corporation
InventorHidemi Noguchi
Life of this patent
Estimating the term…
Abstract
An A/D converter comprises a sample and hold circuit receiving a signal and operating based on a sampling clock, an A/D converting circuit converting an output signal of the sample and hold circuit to a digital signal, an A/D output determination circuit outputting a duty control signal based on the digital signal and a sampling clock generator adjusting a duty ratio of a sampling clock and applying the sampling clock to the sample and hold circuit.
Claims21
An analog to digital (A/D) converter, comprising:
- a sample and hold circuit receiving a signal and operating based on a sampling clock;
- an A/D converting circuit converting an output signal of the sample and hold circuit to a digital signal;
- an A/D output determination circuit outputting a duty control signal based on the digital signal;
- a training signal generator, provided at an output of the A/D output determination circuit, to generate a predetermined training signal and outputting the training signal to the sample and hold circuit, wherein the A/D output determination circuit compares an expected value obtained from the training signal to a parameter obtained from the digital output signal and generates the duty control signal based on a comparison result;
- and a sampling clock generator adjusting a duty ratio of a sampling clock based on the comparison result and applying the sampling clock to the sample and hold circuit.
A duty ratio control method of an analog to digital (A/D) converter which samples and holds a signal and operated based on a sampling clock having a duty ratio, the method comprising:
- generated a predetermined training signal at an output of the A/D converter;
- outputting a digital signal which is a digitalized signal of the training signal;
- measuring a predetermined parameter of the digital signal;
- comparing the predetermined parameter to an expected value obtained from the training signal;
- and determining the duty ratio of the sampling clock based on a comparison result.
A duty ratio control method of an analog to digital (A/D) converter which samples and holds a received signal, operates based on a sampling clock having a duty ratio and regenerated a digital signal from the received signal, the method comprising:
- outputting a digital signal which is a digitalized signal of the received signal;
- correcting an error included in the digital signal;
- generating a predetermined training signal at an output of the A/D converter;
- comparing an expected value obtained from the training signal to a parameter obtained from the digital signal and generating a duty control signal based on the comparison result;
- and determining the duty of the sampling clock based on an error rate including the digital signal and the comparison result.
Dependencies are inferred from the claim text.