Design and Analysis of CMOS Dynamic Comparator for High-Speed Low-Power Applications Using Charge Sharing Technique

Abstract

Analog–digital converters (ADCs) are electronic circuits that convert continuous time signals into digital signals (binary data) for analyzing, estimation, and transmission. Transceivers use ADC in the baseband stage of receiver to convert the analog signals to digital form for further signal processing. At high-frequency applications, like millimeter wave applications, the ADC consumes more power due to the high sampling rate with respect to the increased bandwidth. In this article, a novel dynamic comparator is presented with delay and power analysis for the design. The expression is derived for all operational regions of the transistor. The new design is proposed for low-power consumption and reduced delay of the circuit. The novel design overcomes the drawbacks of the less operating frequency range, high latency, and more power dissipation of existing comparator designs. The proposed low-power dynamic comparator is simulated with 45 nm CMOS technology that provides total power dissipation of 33.92 µW, delay of 19.71 ps, and energy per conversion of 0.19 fJ/conv. with a supply voltage of 1 V.

KEYWORDS:

• Analog to digital converter
• Charge sharing technique
• Complementary metal oxide semiconductor
• Dynamic comparator
• High speed comparator
• Latch

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

K. Dineshkumar

K Dineshkumar received BTech degree in electronics and communication engineering in 2015, MTech degree in electronics and communication engineering in 2019. He is pursuing PhD degree in Pondicherry Engineering College, Pondicherry University. Corresponding author. Email: [email protected]

Gnanou Florence Sudha

Gnanou Florence Sudha received BTech degree in electronics and communication engineering in 1992, MTech degree in electronics and communication engineering in 1994, and PhD degree in Pondicherry Engineering College, Pondicherry University. Currently, she is working as a professor in the Department of Electronics and Communication Engineering, Pondicherry Engineering College. She has 27 years of teaching experience and published more 75 research papers in the area of medical optics and signal processing. She is life member of ISTE, Biomedical Society of India and Optical Society of India. Email: [email protected]