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A novel low-noise linear-in-db intermediate frequency variable-gain amplifier for DRM/DAB tuners

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Journal of Semiconductors 2009年第3期30卷 92-96页

作者：王科平王志功周建政雷雪梅周明珠 Institute of RF-& OE-ICs Southeast University

A broadband CMOS intermediate frequency （IF） variable-gain amplifier （VGA） for DRM/DAB tuners is presented. The VGA comprises two cascaded stages： one is for noise-canceling and another is for signal-summing. The chip is fabricated in a standard 0.18μm 1P6M RF CMOS process of SMIC. Measured results show a good linear-in-db gain characteristic in 28 db dynamic gain range of-10 to 18 db. It can operate in the frequency range of 30-700 MHz and consumes 27 mW at 1.8 V supply with the on-chip test buffer. The minimum noise figure is only 3.1 db at maximum gain and the input-referred 1 db gain compression point at the minimum gain is -3.9 dbm.

关键词： VGA noise-canceling linear-in-db CMOS

Single-Stage Wide-Range CMOS VGA with Temperature Compensation and linear-in-db Gain Control

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Journal of Semiconductors 2007年第4期28卷 518-525页

作者：恽廷华尹莉吴建辉时龙兴东南大学国家专用集成电路系统工程技术研究中心南京210096

A novel wide-range CMOS variable gain amplifier （VGA） topology is presented. The proposed VGA is composed of a variable transconductor and a novel variable output resistor and can offer a high gain variation range of 80db while using a single variable-gain stage. Temperature-compensation and decibel-linear gain characteristic are achieved by using a control circuit that provides a gain error lower than ±1.5db over the full temperature and gain ranges. Realized in 0.25μm CMOS technology, a prototype of the proposed VGA provides a total gain range of 64.5db with 55.6db-linear range,a P-1db varying from - 17.5 to 11.5dbm,and a 3db-bandwith varying from 65 to 860MHz while dissipating 16.5mW from a 2.5V supply voltage.

关键词： linear-in-db temperature compensation variable-gain amplifier automatic gain control

A programmable gain amplifier with a DC offset calibration loop for a directconversion WLAN transceiver

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Journal of Semiconductors 2011年第4期32卷 124-130页

作者：雷倩倩林敏陈治明石寅 Department of Applied Electronics Xi'an University of Technology Suzhou-CAS Semiconductors Integrated Technology Research Center

A high-linearity PGA（programmable gain amplifier） with a DC offset calibration loop is *** PGA adopts a differential degeneration structure to vary voltage gain and uses the closed-loop structure including the input op-amps to enhance the linearity.A continuous time feedback based DC offset calibration loop is also designed to solve the DC offset *** PGA is fabricated by TSMC 0.13μm CMOS *** measurements show that the receiver PGA（RXPGA） provides a 64 db gain range with a step of 1 db,and the transmitter PGA（TXPGA） covers a 16 db *** RXPGA consumes 18 mA and the TXPGA consumes 7 mA （I and Q path） under a 3.3 V *** bandwidth of the multi-stage PGA is higher than 20 *** addition,the DCOC（DC offset cancellation） circuit shows 10 kHz of HPCF（high pass cutoff frequency） and the DCOC settling time is less than 0.45μs.

关键词： linear-in-db PGA DC offset calibration

A high-performance low-power CMOS AGC for GPS application

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Journal of Semiconductors 2010年第2期31卷 49-53页

作者：雷倩倩许奇明陈治明石寅林敏贾海珑 Department of Applied Electronics Xi'an University of Technology Suzhou-CAS Semiconductors Integrated Technology Research Center

A wide tuning range,low power CMOS automatic gain control（AGC） with a simple architecture is proposed. The proposed AGC is composed of a variable gain amplifier（VGA）,a comparator and a charge pump,and the db-linear gain is controlled by the charge *** AGC was implemented in a 0.18μm CMOS *** dynamic range of the VGA is more than 55 db,the bandwidth is 30 MHz,and the gain error is lower than±1.5 db over the full temperature and gain *** is designed for GPS application and is fed from a single 1.8 V power supply. The AGC power consumption is less than 5 mW,and the area of the AGC is 700×450μm^2.

关键词： linear-in-db comparator variable gain amplifier automatic gain control

A wideband CMOS variable gain low noise amplifier

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High Technology Letters 2010年第2期16卷 194-198页

作者：李海松 Li Zhiqun Zhang Hao Li Wei Wang Zhigong Institute of RF-＆OE-ICS Southeast University Nanjing 210096 P.R.China

In this paper, a novel structure of linear-in-db gain control is introduced. Based on this structure, a wideband variable gain low noise amplifier （VGLNA） has been designed and implemented in 0.18μm RF CMOS technology. The measured resuhs show a good linear-in-db gain control characteristic with 15 db dynamic range. It can operate in the frequency range of MHz and consumes 30mW from 1.8V power supply. The minimum noise figure is 4.1 db at the 48 - 860 maximum gain and the input P1db is greater than - 16.5dbm.

关键词： low noise amplifier (LNA) wideband linear-in-db CMOS