A Noise Reduction 12-bit 125-MSPS SAR ADC with Modified Asynchronous Logic Regulation Technique
| Autor: | Dongbin Fu, Xing Sheng, Wang Jian'an, Guangbing Chen, Shiliu Xu, Xu Daiguo, Ting Sun, Can Zhu, Han Yang |
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| Rok vydání: | 2020 |
| Předmět: |
12-bit
Computer science Noise reduction Transconductance 020208 electrical & electronic engineering Analog-to-digital converter Successive approximation ADC 02 engineering and technology General Medicine 020202 computer hardware & architecture law.invention Hardware and Architecture law 0202 electrical engineering electronic engineering information engineering Electronic engineering Shaping Electrical and Electronic Engineering Asynchronous circuit |
| Zdroj: | Journal of Circuits, Systems and Computers. 30:2150040 |
| ISSN: | 1793-6454 0218-1266 |
| DOI: | 10.1142/s0218126621500407 |
| Popis: | This paper presents noise reduction and modified asynchronous logic regulation techniques used in successive approximation register (SAR) analog-to-digital converter (ADC). With a transconductance enhanced structure, noise reduction is provided in the dynamic comparator. The input referred noise of the proposed comparator is about 165[Formula: see text][Formula: see text]V rms at 60∘C (typical corner). An enhanced-positive-feedback loop is introduced to reduce the regeneration delay of the comparator. In addition, a modified asynchronous logic regulation technique is exhibited, a clock with adaptable delay is driving the comparator in approximation phase. Consequently, the settling accuracy of DAC (Digital-to-Analog Converter) is enough and the conversion speed of SAR ADC is increased without any redundant cycles. To demonstrate the proposed techniques, a design of SAR ADC is fabricated in 65-nm CMOS technology, consuming 4[Formula: see text]mW from 1.2[Formula: see text]V power supply with a [Formula: see text][Formula: see text]dB and [Formula: see text][Formula: see text]dB. The proposed ADC core occupies an active area of 0.048[Formula: see text]mm2, and the corresponding FoM is 27.2[Formula: see text]fJ/conversion-step at Nyquist rate. |
| Databáze: | OpenAIRE |
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