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Digitally-Controlled Variable-Gain-Amplifier Based on Current Conveyor with Opamp and Inverters Only
Faculty
Not Specified
Year:
2010
Type of Publication:
InProcceding
Pages:
Authors:
Farag, Fathi A, Khalaf, Yaser A
Journal:
IEEE
Volume:
Research Area:
Engineering; Science \& Technology - Other Topics
ISSN
ISI:000290617900057
Keywords :
Digitally-Controlled Variable-Gain-Amplifier Based , Current Conveyor with
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 {[}1]. 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 mu m 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.
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