Login | Register

Design of Adaptive Amplifiers with DC Varying Inputs


Design of Adaptive Amplifiers with DC Varying Inputs

Leduc, Pascal (2012) Design of Adaptive Amplifiers with DC Varying Inputs. Masters thesis, Concordia University.

Text (application/pdf)
Leduc_MASc_S2013.pdf - Accepted Version
Available under License Spectrum Terms of Access.


Analog amplifiers are one of the most commonly used building blocks in electronic systems. Emerging circuit technologies create new systems and also new applications for signal amplification. A conventional amplifier operates at a fixed biasing point to transfer signals varying on a fixed DC level with a constant or variable gain. In some new systems, particularly those involving sensors, the DC component of a signal to be amplified can be variable, instead of fixed. The established design procedure is not applicable for such signals.

In this thesis, a design method for adaptive amplifiers is proposed. It is to design an amplifier that can adjust itself automatically to suit the DC level of the input voltage and the amplification gain is variable according to the input DC level. The amplifier is made to perform, from a small signal point view, a linear amplification with a fixed gain, but from a large signal point view, a nonlinear voltage transfer. The nonlinear character of its function makes the amplifier capable of operating with an input voltage of which the DC level can vary in a specified range and providing a gain adapting to the input DC level.

The proposed method has been used to design an amplifier for a voltage signal enhancement in a wide dynamic range current-to-voltage conversion circuit. The designed amplifier has four cascading stages, i.e., three simple common source amplifier stages and one source follower. The units are tuned to perform a nonlinear voltage transfer while keeping a local linearity. These units are combined to implement the characteristics needed for the signal enhancement. The circuit has been simulated and the results demonstrated that it is able to perform the required amplification of the signal varying on different DC levels with an input-dependent gain.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering
Item Type:Thesis (Masters)
Authors:Leduc, Pascal
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Electrical and Computer Engineering
Date:August 2012
Thesis Supervisor(s):Wang, Chunyan
Keywords:Adaptive amplifier, Variable gain amplifier, DC varying input, non-linear amplifier
ID Code:974795
Deposited By: PASCAL LEDUC
Deposited On:06 Jun 2013 19:41
Last Modified:18 Jan 2018 17:39


Wang, Chunyan; “Wide-Dynamic-Range and High-Sensitivity Current-to-Voltage Converters”; Circuits, Systems and Signal Processing, vol. 29, no. 6, pp. 1223-1236, 2010.

Johns, David, Martin, Ken; “Analog Integrated Circuit Design”; John Wiley & Sons, 1997.

Sedra, Adel S., Smith, Kenneth C.; “Microelectronic Circuits”, fifth edition; Oxford University Press,: New York, 2004

Song, W.C., Oh, C. J., Cho, G. H., Jung, H. B.; ”High frequency / high dynamic range CMOS VGA”; Electronics Letters , vol. 36, no. 13, pp.1096-1098, Jun 2000

Hosticka, B. J.; ”Dynamic CMOS amplifiers”, Solid-State Circuits, IEEE Journal of, vol. 15, no. 5, pp. 881- 886, Oct 1980

Degrauwe, M.G.; Rijmenants, J.; Vittoz, E.A.; De Man, H.J.; , "Adaptive biasing CMOS amplifiers," Solid-State Circuits, IEEE Journal of , vol.17, no.3, pp.522-528, June 1982

Bazes, M.; "Two novel fully complementary self-biased CMOS differential amplifiers," Solid-State Circuits, IEEE Journal of, vol. 26, no. 2, pp. 165-168, Feb 1991

Rahul Sarpeshkar; Richard F. Lyon; and Carver Mead; “A Low-Power Wide-Dynamic-Range Analog VLSI Cochlea”; Analog Integr. Circuits Signal Process. vol. 16, no. 3, 245-274, August 1998

Bonghyuk Park; Jaeho Jung; “A triple gain mode digitally controlled amplifier in cmos process”; Microwave & Optical Technology Letters; vol. 54, no. 5, pp. 1263–1266, May 2012

Elwan, H.; El Adawi, A.; Ismail, M.; Olsson, H.K.; Soliman, A.; "Digitally controlled dB-linear CMOS variable gain amplifier," Electronics Letters , vol. 35, no. 20, pp. 1725-1727, Sep 1999

Parlak, M.; Matsuo, M.; Buckwalter, J.; "A 6-bit wideband variable gain amplifier with low group delay variation in 90nm CMOS," Silicon Monolithic Integrated Circuits in RF Systems (SiRF), 2012 IEEE 12th Topical Meeting on , pp. 147-150, 16-18 Jan. 2012

Ye Xiangyang et al; “A binary-weighted 64-dB programmable gain amplifier with a DCOC and AB-class buffer,” Journal of Semiconductors, vol. 33 no. 2, Sept. 2011.

So Young Kang; Jooyoung Jang; Inn-Yeal Oh; Chul Soon Park; "A 2.16 mW Low Power Digitally-Controlled Variable Gain Amplifier," Microwave and Wireless Components Letters, IEEE , vol. 20, no.3 , pp. 172-174, March 2010

Youngmin Kim; Youngwoo Kwon; "A 60 GHz Cascode Variable-Gain Low-Noise Amplifier With Phase Compensation in a 0.13 μmCMOS Technology," Microwave and Wireless Components Letters, IEEE , vol. 22, no. 7, pp. 372-374, July 2012

Kwon, J.K.; Kim, K.D.; Song, W.C.; Cho, G.H.; "Wideband high dynamic range CMOS variable gain amplifier for low voltage and low power wireless applications," Electronics Letters , vol. 39, no. 10, pp. 759- 760, May 2003

Mangelsdorf, C.W.; "A variable gain CMOS amplifier with exponential gain control," VLSI Circuits, 2000. Digest of Technical Papers. 2000 Symposium on, pp. 146-149, 2000

Chia-Yu Hsieh; Jui-Chih Kao; Kuo, Jhe-Jia; Lin, Kun-You; "A 57–64 GHz low-phase-variation variable-gain amplifier," Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International, pp. 1-3, 17-22 June 2012

El-Gabaly, A.M.; Saavedra, C.E.; "Wideband variable gain amplifier with noise cancellation," Electronics Letters , vol. 47, no. 2, pp. 116-118, January 2011

Yamaji, T.; Kanou, N.; Itakura, T.; "A temperature stable CMOS variable gain amplifier with 80-dB linearly controlled gain range," VLSI Circuits, 2001. Digest of Technical Papers. 2001 Symposium on , pp. 77-80, 2001

Ping Chen; Ze-Yu Liao; Che-Chung Kuo; Huei Wang; "A variable gain distributed amplifier with low voltage and low power in 0.18-μm CMOS technology," Microwave Integrated Circuits Conference (EuMIC), European , pp. 573-576, 10-11 Oct. 2011

Po-Chiun Huang; Li-Yu Chiou; Chorng-Kuang Wang; "A 3.3-V CMOS wideband exponential control variable-gain-amplifier," Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on, vol. 1, pp. 285-288, 31 May-3 Jun 1998

Qi Yu; Wen Luo; Ning Ning; Zhenya Sun; Chengbi Wang; Yong Hu; Tianzhu Li; "A CMOS dB-linear variable amplifier using curvematching," Mechatronic Science, Electric Engineering and Computer (MEC), 2011 International Conference on , pp. 2369-2372, 19-22 Aug. 2011

Rijns, J.J.F.; "CMOS low-distortion high-frequency variable-gain amplifier," Solid-State Circuits, IEEE Journal of , vol. 31, no. 7, pp. 1029-1034, Jul 1996

Duong, Q.-H.; Lee, S.-G.; "Wide dynamic range variable-gain amplifier based on new approximated exponential equation," Electronics Letters , vol. 42, no. 23, pp. 1319-1390, November 2006
All items in Spectrum are protected by copyright, with all rights reserved. The use of items is governed by Spectrum's terms of access.

Repository Staff Only: item control page

Downloads per month over past year

Back to top Back to top