A low-offset high CMRR current-mode instrumentation amplifier using differential difference current conveyor

2014 ◽  
Author(s):  
Ugur Cini
Keyword(s):  
Current Mode ◽  
Current Conveyor ◽  
Instrumentation Amplifier ◽  
High Cmrr ◽  
Low Offset

scholarly journals A Novel Fully Differential Second Generation Current Conveyor and Its Application as a Very High CMRR Instrumentation Amplifier

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Soma Ahmadi ◽  
Seyed Javad Azhari
Keyword(s):  
Second Generation ◽  
Current Mode ◽  
Cmos Technology ◽  
Current Conveyor ◽  
Instrumentation Amplifier ◽  
Intrinsic Resistance ◽  
Common Mode ◽  
Fully Differential ◽  
High Cmrr ◽  
Very High

This paper aims to introduce a novel Fully Differential second generation Current Conveyor (FDCCII) and its application to design a novel Low Power (LP), very high CMRR, and wide bandwidth (BW) Current Mode Instrumentation Amplifier (CMIA). In the proposed application, CMRR, as the most important feature, has been greatly improved by using both common mode feed forward (CMFF) and common mode feedback (CMFB) techniques, which are verified by a perfect circuit analysis. As another unique quality, it neither needs well-matched active blocks nor matched resistors but inherently improves CMRR, BW, and power consumption hence gains an excellent matchless choice for integration. The FDCCII has been designed using 0.18 um TSMC CMOS Technology with ±1.2 V supply voltages. The simulation of the proposed FDCCII and CMIA have been done in HSPICE LEVEL 49. Simulation results for the proposed CMIA are as follow: Voltage CMRR of 216 dB, voltage CMRR BW of 300 Hz. Intrinsic resistance of X-terminals is only 45 Ω and the power dissipation is 383.4 μW.  Most favourably, it shows a constant differential voltage gain BW of 18.1 MHz for variable gains (here ranging from 0 dB to 45.7 dB for example) removing the bottleneck of constant gain-BW product of Voltage mode circuits.

A High Performance Current-Mode Instrumentation Amplifier with Level Shifter for Single Power Biomedical Applications

2014 ◽  
Vol 530-531 ◽  
pp. 217-220
Author(s):  
Hwang Cherng Chow ◽  
Bing Shiun Tang
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Current Mode ◽  
Cmos Technology ◽  
Low Noise ◽  
Instrumentation Amplifier ◽  
Level Shifter ◽  
High Cmrr ◽  
Cmos Implementation ◽  
Single Power

In this paper, a high performance current-mode instrumentation amplifier has been proposed with low noise, low power and high CMRR features. The proposed design can adjust the gain with an external resistor for the processing of various biomedical signals. To reduce the noise of the amplifier, two design methods including PMOS input and lateral pnp BJT input have been implemented to improve the prior arts. To meet the single power supply need, a biomedical voltage level shifter is also proposed for low cost CMOS implementation. Based on the post-layout simulation results, the presented current-mode amplifier achieves high CMRR over 120 dB, power consumption of 61 uW at 1.8-V supply using standard 0.18-um CMOS technology.

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