A novel wide band super transistor based voltage feedback current amplifier

Authors:  Leila Safari, Seyed Javad Azhari

Abstract:
This paper is assigned to the design of voltage feedback current amplifiers (VFCAs). Their operation and interesting characteristics are covered and a novel CMOS VFCA is presented. New ideas based on super transistors (STs) are devised and used to design a high performance VFCA. Benefiting from the interesting properties of STs, the proposed VFCA exhibits high linearity, high output impedance, very low input impedance and wide bandwidth. The proposed circuit is designed using TSMC 0.18 m CMOS technology parameters and supply voltage of ±0.75V. Simulation results with HSPICE show low THD of −60 dB at the output signal, very low impedance of 0.6 and 0.2 at the input and feedback ports respectively and high output impedance of 10 M. Moreover it can provide wide −3 dB bandwidth of 15.5 MHz. The results prove the high capability of the VFCA in current mode signal processing and encourage strong motivation to develop commercially available VFCAs.

Keywords:
Voltage feedback current amplifier
Low input impedance
High output impedance
Wide band current amplifier
Super transistor

Published in: AEÜ-International Journal of Electronics and Communications (Volume 67, Issue 7, July  2013)

Publisher: Elsevier

ISSN Information: 1434-8411

A novel wide band super transistor based voltage feedback current amplifier

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