Asynchronous Sar Adc Thesis

The testing speed is limited to 300 MS/s due to the equipment restriction (logic analyzer).

So the power supply is reduced to 1.2-V during testing.

This ADC achieves the best Fo M of any ADCs with greater than 10b ENOB and 10MS/s sampling rate.

High-speed high-precision analog-to-digital converters (ADCs) are widely used in the fields of image processing, information storage and wireless communication.

A 67.4d B SNDR, 78.1d B SFDR, 1.0/-0.9 LSB₁₂ INL and 0.5/-0.7 LSB₁₂ DNL are achieved at 50MS/s at Nyquist rate.

Asynchronous Sar Adc Thesis Youth Work Course

The total power consumption, including the estimated calibration and reference power, is 2.1m W, corresponding to 21.9f J/conv.- step Fo M.Your access to the NCBI website at gov has been temporarily blocked due to a possible misuse/abuse situation involving your site.This is not an indication of a security issue such as a virus or attack.To push the sampling speed even higher, separate digital-to-analog-converter (DAC) arrays are used for the MDAC and sub-ADC to reduce the first-stage SAR ADC bit-cycling time constant in order to compress the quantization time.A loop-unrolled asynchronous SAR ADC is used to speed up the sub-ADC further. The main contributions include investigation of using digital error correction (redundancy) in SAR ADCs for dynamic error correction and speed improvement, development of two new calibration algorithms to digitally correct for manufacturing mismatches, design of new architecture to incorporate redundancy within the architecture itself while achieving 94% better energy eciency compared to conventional switching algorithm, development of a new capacitor DAC structure to improve the SNR by four times with improved matching, joint design of the analog and digital circuits to create an asynchronous platform in order to reach the targeted performance, and analysis of key circuit blocks to enable the design to meet noise, power and timing requirements. In this the- sis, a sub-radix-2 SAR ADC is presented with several new contributions. In SAR ADCs, the key linearity and speed limiting factors are capacitor mismatch and incomplete digital-to-analog converter (DAC)/reference voltage settling. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. As technology scales, the improved speed and energy eciency make the successive- approximation-register (SAR) architecture an attractive alternative for applications that require high-speed and high-accuracy analog-to-digital converters (ADCs).So for a 5- or 6-bit first stage, it is not easy to design a high-speed closed-loop MDAC to meet the requirement.In this work, a pipelined-SAR is designed with an open-loop MDAC.


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