Dipak Marathe; Uday Pandit Khot

A 1-V 10-bit 16.83-fJ/Conversion-step Mixed Current Mode SAR ADC for WSN

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Author(s)

Dipak Marathe ^1,* Uday Pandit Khot ²

1. Sardar Patel Institute of Technology, Mumbai-400058, India

2. St. Francis Institute of Technology, Borivali, Mumbai-400103, India.

* Corresponding author.

DOI: https://doi.org/10.5815/ijigsp.2019.11.06

Received: 13 Jun. 2019 / Revised: 11 Jul. 2019 / Accepted: 7 Aug. 2019 / Published: 8 Nov. 2019

Index Terms

Successive approximation register (SAR), mixed-mode, current-mode, regenerative -comparator, analog-to-digital-converter (ADC), digital-to-analog converter (DAC).

Abstract

This paper proposes a 10-bit mixed current mode low power SAR ADC for sensor node application. The different entities of a successive approximation register (SAR) analog-to-digital converter (ADC) circuit has a hybrid or mixed mode approach i.e.,voltage mode regenerative comparator; mixed SAR logic; and current mode digital-to-analog converter (DAC). The performance limitation of speed and the kick-back noise of a dynamic comparator is resolved using duty cycle controlled regenerative comparator. A mixed mode logic of a SAR is partitioning the design into synchronous ring counter and asynchronous output register. The data shifting of a ring counter is with the common clock tick while the output register exchanged it asynchronously using handshake signals, resulting in a low power SAR. The current mode switching function in a DAC to reduce asynchronous switching effect resulting in a low energy conversion per step. In overall, the proposed mixed SAR ADC consumes a 41.6 power and achieves an SFDR 69.3 dB at 10 MS/sec and 1 V supply voltage. It is designed and simulated in the 0.18 m TSMC CMOS process.

Cite This Paper

Dipak S. Marathe, Uday P. Khot, IEEE, Member, " A 1-V 10-bit 16.83-fJ/Conversion-step Mixed Current Mode SAR ADC for WSN", International Journal of Image, Graphics and Signal Processing(IJIGSP), Vol.11, No.11, pp. 43-50, 2019. DOI: 10.5815/ijigsp.2019.11.06

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International Journal of Image, Graphics and Signal Processing (IJIGSP)