Digitally-Controlled Variable-Gain-Amplifier based on current conveyor with opamp and inverters only

Author

Farag, Fathi A. ; Khalaf, Yaser A.

Author_Institution

Electron. & Commun. Dept., Zagazig Univ., Zagazig, Egypt

fYear

2010

fDate

19-22 Dec. 2010

Firstpage

224

Lastpage

227

Abstract

This paper presents a new topology of a Digitally-Controlled current-mode-Variable-Gain-Amplifier “DCVGA”. A fully differential DCVGA is proposed, which improves the VGA performance. The proposed circuit is based on the current conveyor cell reported in. The circuit is suitable for low-power low-voltage applications since it is based on CMOS inverters. The proposed DCVGA achieves linear-in-dB gain variation at 1dB resolution. The variable gain is tuned from -5 to 36 dB. The proposed circuits have been designed and simulated using 0.13 μm IBM CMOS process. The simulation results show good performance in both gain-tuning ability and frequency response. Also, the 3-dB bandwidth is about 50 kHz at maximum gain. The power dissipation is 2.1mW from 1.5V supply voltage.

Keywords

amplification; current conveyors; operational amplifiers; CMOS inverter; CMOS process; current conveyor cell; digitally-controlled current-mode-variable-gain-amplifier; frequency response; gain -5 dB to 36 dB; gain-tuning ability; inverters; opamp; power 2.1 mW; power dissipation; size 0.13 mum; voltage 1.5 V; Bandwidth; CMOS integrated circuits; Gain; Inverters; Radio frequency; Resistors; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics (ICM), 2010 International Conference on

Conference_Location

Cairo

Print_ISBN

978-1-61284-149-6

Type

conf

DOI

10.1109/ICM.2010.5696123

Filename

5696123