Design of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology

This paper presents a wideband dB-linear variable-gain amplifier (VGA) with a DC-offset cancellation network in a 90-nm CMOS technology for high-speed applications. The VGA consists of a four-stage Cherry-Hooper amplifier, which is based on a feedback resistor and negative Miller capacitance to obta...

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Autores principales:	Chenxuan Fan, Zhiming Chen, Zicheng Liu, Xiao Li, Xiaoran Li, Quanwen Qi, Wei Gu, Xinghua Wang
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Analog-controlled cell-based Cherry-Hooper dB-linear inductorless low-power Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/a10799da73254bc5aebfcdf1aa1308a2
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spelling	oai:doaj.org-article:a10799da73254bc5aebfcdf1aa1308a22021-11-20T00:01:50ZDesign of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology2169-353610.1109/ACCESS.2021.3127356https://doaj.org/article/a10799da73254bc5aebfcdf1aa1308a22021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9611290/https://doaj.org/toc/2169-3536This paper presents a wideband dB-linear variable-gain amplifier (VGA) with a DC-offset cancellation network in a 90-nm CMOS technology for high-speed applications. The VGA consists of a four-stage Cherry-Hooper amplifier, which is based on a feedback resistor and negative Miller capacitance to obtain wide bandwidth without inductors in the main circuit. A unique method for this structure to generate pseudo-exponential function is analyzed in detail. Therefore, an accurate dB-linear characteristic is realized in this VGA without any exponential generator circuits. The linear control voltage is applied directly to the gate of the transistor and this simple control method exhibits good robustness to process and temperature variation. Measurement results show that the voltage gain varies from −28 dB to 27 dB continuously with more than 4.3 GHz bandwidth and a dB-linear range of 32 dB with less than ±0.6 dB gain error. Without the output buffer, it consumes 8.5 mW from a 1.2V supply and occupies a small die area of only 0.04 mm<sup>2</sup>.Chenxuan FanZhiming ChenZicheng LiuXiao LiXiaoran LiQuanwen QiWei GuXinghua WangIEEEarticleAnalog-controlledcell-basedCherry-HooperdB-linearinductorlesslow-powerElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 152646-152656 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Analog-controlled cell-based Cherry-Hooper dB-linear inductorless low-power Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Analog-controlled cell-based Cherry-Hooper dB-linear inductorless low-power Electrical engineering. Electronics. Nuclear engineering TK1-9971 Chenxuan Fan Zhiming Chen Zicheng Liu Xiao Li Xiaoran Li Quanwen Qi Wei Gu Xinghua Wang Design of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology
description	This paper presents a wideband dB-linear variable-gain amplifier (VGA) with a DC-offset cancellation network in a 90-nm CMOS technology for high-speed applications. The VGA consists of a four-stage Cherry-Hooper amplifier, which is based on a feedback resistor and negative Miller capacitance to obtain wide bandwidth without inductors in the main circuit. A unique method for this structure to generate pseudo-exponential function is analyzed in detail. Therefore, an accurate dB-linear characteristic is realized in this VGA without any exponential generator circuits. The linear control voltage is applied directly to the gate of the transistor and this simple control method exhibits good robustness to process and temperature variation. Measurement results show that the voltage gain varies from −28 dB to 27 dB continuously with more than 4.3 GHz bandwidth and a dB-linear range of 32 dB with less than ±0.6 dB gain error. Without the output buffer, it consumes 8.5 mW from a 1.2V supply and occupies a small die area of only 0.04 mm<sup>2</sup>.
format	article
author	Chenxuan Fan Zhiming Chen Zicheng Liu Xiao Li Xiaoran Li Quanwen Qi Wei Gu Xinghua Wang
author_facet	Chenxuan Fan Zhiming Chen Zicheng Liu Xiao Li Xiaoran Li Quanwen Qi Wei Gu Xinghua Wang
author_sort	Chenxuan Fan
title	Design of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology
title_short	Design of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology
title_full	Design of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology
title_fullStr	Design of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology
title_full_unstemmed	Design of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology
title_sort	design of a wideband db-linear variable gain amplifier with continuous gain adjusting in 90-nm cmos technology
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/a10799da73254bc5aebfcdf1aa1308a2
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Design of a Wideband dB-Linear Variable Gain Amplifier With Continuous Gain Adjusting in 90-nm CMOS Technology

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