High CMRR and low THD current-mode instrumentation amplifier using current inversion technique

Author

Babaei, Behnam ; Mirzakuchaki, Sattar

Author_Institution

Iran Univ. of Sci. & Technol., Tehran

fYear

2007

fDate

19-20 Nov. 2007

Firstpage

1

Lastpage

4

Abstract

The current-mode instrumentation amplifier based on second-generation current conveyors (CCII) offers many benefits over conventional instrumentation amplifier architectures. It does not need any matched components to achieve high CMRR and its bandwidth is not gain-bandwidth product limited. Therefore, a wideband CMOS current conveyor has been used in this structure. HSPICE simulations have shown that its performance is quite satisfactory for wideband current-mode signal processing. Furthermore, CMRR enhancement technique of current-mode instrumentation amplifiers is discussed. In addition, composite conveyor techniques which improve the instrumentation amplifier performance are presented. The new simulated instrumentation amplifier provides approximately 44 dB of improvement on the high-frequency CMRR up to the 3-dB corner frequency and even higher. Also a THD of %0.6 has been achieved.

Keywords

CMOS integrated circuits; current conveyors; harmonic distortion; instrumentation amplifiers; HSPICE; THD current-mode instrumentation amplifier; current inversion technique; second-generation current conveyor; wideband CMOS current conveyor; Bandwidth; Broadband amplifiers; Circuits; Frequency; Instruments; Operational amplifiers; Resistors; Signal processing; Voltage; Wideband; CMRR; Current Subtraction Technique; THD; current conveyor; low power; wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Norchip, 2007

Conference_Location

Aalborg

Print_ISBN

978-1-4244-1516-8

Electronic_ISBN

978-1-4244-1517-5

Type

conf

DOI

10.1109/NORCHP.2007.4481064

Filename

4481064