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A novel analog/digital reconfigurable automatic gain control with a novel DC offset cancellation circuit

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Journal of Semiconductors 2011年第2期32卷 79-84页

作者：何晓丰莫太山马成炎叶甜春 Institute of Microelectronics Chinese Academy of Science Hangzhou Zhongke Microelectronics Co Ltd

An analog/digital reconfigurable automatic gain control （AGC） circuit with a novel DC offset cancel- lation circuit for a direct-conversion receiver is presented. The AGC is analog/digital reconfigurable in order to be compatible with different baseband chips. What＇s more, a novel DC offset cancellation （DCOC） circuit with an HPCF （high pass cutoff frequency） less than 10 kHz is proposed. The AGC is fabricated by a 0.18μm CMOS process. Under analog control mode, the AGC achieves a 70 dB dynamic range with a 3 dB-bandwidth larger than 60 MHz. Under digital control mode, through a 5-bit digital control word, the AGC shows a 64 dB gain control range by 2 dB each step with a gain error of less than 0.3 dB. The DC offset cancellation circuits can suppress the output DC offset voltage to be less than 1.5 mV, while the offset voltage of 40 mV is introduced into the input. The overall power consumption is less than 3.5 mA, and the die area is 800 ×300μm2.

关键词： automatic gain control analog/digital reconfigurable DC offset cancellation

A digitally calibrated CMOS RMS power detector for RF automatic gain control

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Journal of Semiconductors 2013年第3期34卷 63-69页

作者：闫涛涛王辉李金波周健军 School of Microelectronics Shanghai Jiao Tong University

This paper presents the design and implementation of a digitally calibrated CMOS wideband radio frequency(RF) root-mean-square(RMS) power detector for high accuracy RF automatic gain control(AGC).The proposed RMS power detector demonstrates accurate power detection in the presence of process,supply voltage, and temperature(PVT) variations by employing a digital calibration scheme.It also consumes low power and occupies a small chip area.The measurement results show that the scheme improves the accuracy of the detector to better than 0.3 dB over the PVT variations and wide operating frequency range from 0.2 to 0.8 GHz.Implemented in a 0.18μm CMOS process and occupying a small die area of 263×214μm^2,the proposed digitally calibrated CMOS RMS power detector only consumes 1.6 mA in power detection mode and 2.1 mA in digital calibration mode from a 1.8 V supply voltage.

关键词： automatic gain control digital calibration radio-frequency RMS power detector

A differential automatic gain control circuit with two-stage -10 to 50 dB tuning range VGAs

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Journal of Semiconductors 2013年第2期34卷 103-108页

作者：王文波毛陆虹肖新东张世林谢生 School of Electronic and Information Engineering Tianjin University The Macro-System Engineering Department of CNGC

A differential automatic gain control （AGC） circuit is presented. The AGC architecture contains twostage variable gain amplifiers （VGAs） which are implemented with a Gilbert cell, a peak detector （PD）, a low pass filter, an operational amplifier, and two voltage to current （V-I） convertors. One stage VGA achieves 30 dB gain due to the use of active load. The AGC circuit is implemented in UMC 0.18-um single-poly six-metal CMOS process technology. Measurement results show that the final differential output swing of the 2nd stage VGA is about 0.9-Vpp; the total gain of the two VGAs can be varied linearly from -10 to 50 dB when the control voltage varies from 0.3 to 0.9 V. The final circuit （containing output buffers and a band-gap reference） consumes 37 mA from single 1.8 V voltage supply. For a 50 mV amplitude 60% modulation depth input AM signal it needs 100 us to stabilize the output. The frequency response of the circuit has almost a constant -3 dB bandwidth of 2.2 MHz. Its OIP3 result is at 19 dBm.

关键词： automatic gain control variable gain amplifier exponential V-I convertor peak detector gain dynamic range

Research on Measurement Method of Ultrasonic Transit Time based on automatic gain control

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Research on Measurement Method of Ultrasonic Transit Time ba...

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

第三十九届中国控制会议

作者： Qinyong Ma Yuanzheng Zhang China Coal Technology and Engineering Group Chongqing Research Institute State Key Laboratory of The Gas Disaster Detecting Preventing and Emergency Controlling

In order to reduce the periodic error in the transit time detection caused by the amplitude jitter, this paper adopts the automatic gain control technology to stabilize the amplitude of received ultrasonic signal, and detect the accurate ultrasonic transit time according to the adaptive threshold method and the zero crossing detection method. The flow calibration experiment is carried out on the self-designed ultrasonic gas flowmeter, the experimental results demonstrate that the measurement accuracy is within ±1% and the repeatability is within 0.2%.

关键词： automatic gain control Ultrasonic transit time Adaptive threshold Zero crossing detection Flow calibration

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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 pump.The AGC was implemented in a 0.18μm CMOS technology.The 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 ranges.It 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

Dual-band RF receiver for GPS-L1 and compass-B1 in a 55-nm CMOS

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Journal of Semiconductors 2014年第2期35卷 92-101页

作者：李松亭李建成谷晓忱庄钊文 School of Electronic Science and Engineering National University of Defense Technology

A fully integrated dual-band RF receiver with a low-IF architecture is designed and implemented for GPS-L 1 and Compass-Bl in a 55-nm CMOS process. The receiver incorporates two independent IF channels with 2 or 4 MHz bandwidth to receive dual-band signals around 1.57 GHz respectively. By implementing a flexible frequency plan, the RF front-end and frequency synthesizer are shared for the dual-band operation to save power consumption and chip area, as well as avoiding LO crosstalk. A digital automatic gain control （AGC） loop is utilized to improve the receiver＇s robustness by optimizing the conversion gain of the analog-to-digital converter （ADC）. While drawing about 20 mA per channel from a 1.2 V supply, this RF receiver achieves a minimum noise figure （NF） of about 1.8 dB, an image rejection （IMR） of more than 35 dB, a maximum voltage gain of about 122 dB, a gain dynamic range of 82 dB, and an maximum input-referred 1 dB compression point of about -36.5 dBm with an active die area of 1.5 × 1.4 mm2 for the whole chip.

关键词： automatic gain control CMOS compass dual-band GPS RF receiver

A SiGe BiCMOS multi-band tuner for mobile TV applications

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Journal of Semiconductors 2012年第4期33卷 75-80页

作者：胡雪青龚正赵锦鑫王磊于鹏石寅 Institute of Semiconductors Chinese Academy of SciencesBeijing 100083China SuZhou-CAS Semiconductor Integration R&D Center Suzhou 215000China

This paper presents the circuit design and measured performance of a multi-band tuner for mobile TV applications. The tuner RFIC is composed of a wideband front-end, an analog baseband, a full integrated fractional- N synthesizer and an Iac digital interface. To meet the stringent adjacent channel rejection （ACR） requirements of mobile TV standards while keeping low power consumption and low cost, direct conversion architecture with a local AGC scheme is adopted in this design. Eighth-order elliptic active-RC filters with large stop band attenuation and a sharp transition band are chosen as the channel select filter to further improve the ACR preference. The chip is fabricated in a 0.35-#m SiGe BiCMOS technology and occupies a silicon area of 5.5 mm2. It draws 50 mA current from a 3.0 V power supply. In CMMB application, it achieves a sensitivity of-97 dBm with 1/2 coding QPSK signal input and over 40 dB ACR.

关键词： tuner multi-band automatic gain control adjacent channel rejection SiGe BiCMOS

Discrete PLL control for Single-Phase Fuel Cell Grid Connected System

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Discrete PLL Control for Single-Phase Fuel Cell Grid Connect...

Servo Loop gain Calibration Using Model Reference Adaptation in HDD Servo Systems

2011 Chinese control and Decision Conference（CCDC）

作者： F.Peng,X.F.Wang,And B.B.Mao are from College of Electrical Engineering,Southwest Jiao Tong University,Chengdu,Sichuan,China

Utility-signal information,such as frequency and phase angle,is very important in many industrial systems.Especially in the power electric grid connection application,the PLL control is used to synchronize the inverter current to the grid voltage to make the power factor as high as possible.However,for a single-phase system,the utility-signal information is much more difficult to acquire than three-phase system.Generally,the frequency and phase angle of a single-phase voltage are obtained by detecting the zero-cross point.Yet,this method cannot provide the utility-voltage information instantaneously and is very sensitive to noise.Another PLL topology based on quadrature two phase frequency detection method is proposed to improve the former method.But its dynamic response for the frequency change is not so satisfying and the choice of the type of components is much more complex.Accordingly,a novel discrete PLL based on the mean value PID control with automatic gain control is proposed in this paper.The proposed method is programmed in C language and compiled to MEX32 executable file as a RTW S-function,and is verified by simulation in Simulink environment.The algorithm uses automatic gain control to optimize the performance of the PID controller,and its performance is also demonstrated by the simulation result of a two-loop feedback fuel cell grid connection system model.

关键词： Discrete PLL control mean value PID control automatic gain control

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Servo Loop Gain Calibration Using Model Reference Adaptation...