An integrated CMOS instrumentation amplifier with improved CMRR

Fabbro, Paulo Augusto Dal; Filho, Carlos Alberto dos Reis

doi:10.1109/sbcci.2002.1137637

Cited by 13 publications

(8 citation statements)

References 8 publications

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“…This paper considers a new calculation method of the DDA errors from the several input common-mode voltages on different inputs (1-2, 3-4) of DDA. Also the circuit and parametric solutions for DDAs input stages, which increase the CMRR are proposed [10,8,11,7,12,13,14,15,9]. The presence of the common-mode voltages 2 / ) (…”

Section: Inclusionmentioning

confidence: 99%

The method of the errors calculation from the input common-mode signal in the analog interfaces based on the differential difference operational amplifiers and the ways of their decrease

Prokopenko

Pakhomov

Bugakova

et al. 2016

2016 International Siberian Conference on Control and Communications (SIBCON)

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The article suggests a new method of the errors evaluation from the several common-mode signals in the differential difference operational amplifiers (DDAs), based on the theory of autonomous multiport circuit. These errors of DDA in its main connection circuits can be described by feeding a special current autonomous parameter to the classical equivalent circuit of DDA. This parameter is connected with the highimpedance node of DDA and depends on the level of the common-mode components in the inputs of some input differential stages and also on the parameters spread of the elements.The paper shows that in DDAs the common-mode rejection ratio (CMRR) significantly worsens in comparison with classical op-amp. The parametric and circuitry methods of CMRR increase in the DDAs based on the inherent compensation of parasitic impedances are considered.

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Section: Inclusionmentioning

confidence: 99%

The method of the errors calculation from the input common-mode signal in the analog interfaces based on the differential difference operational amplifiers and the ways of their decrease

Prokopenko

Pakhomov

Bugakova

et al. 2016

2016 International Siberian Conference on Control and Communications (SIBCON)

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“…In order to maximize the CMRR of the instrumentation amplifier, the value of 1/R 1 and the transconductance of the input pair should be maximized, thus making the amplifier common-mode gain minimum [10], [13]. For the same purpose, the output resistance of current sources M s1,2 and the transconductance of transistors M d1,2 should be set as high as possible.…”

Section: Design Of the Proposed Wideband Current-feedback Instrumentioning

confidence: 99%

Wideband low-power current-feedback instrumentation amplifiers for bioelectrical signals

Ramos

Carrillo

Duque-Carrillo

et al. 2012

International Multi-Conference on Systems, Sygnals &Amp; Devices

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In most bioelectrical acquisition systems, there is the need for amplifying small differential voltages. This paper describes a CMOS instrumentation amplifier (IA) based on the principle of current feedback for use in biological tissue characterization by bioelectrical impedance measurement. The constraints on the design of IA's for wideband operation are addressed. An approach that can be exploited to design a wideband current-feedback IA will be examined. To verify the feasibility of the proposed approach, an IA was designed in 0.35 μ μm CMOS technology for use in the frequency range from 100 Hz to 4 MHz. The designed IA dissipates 240 μW from a single 2-V power supply. Post-layout simulation results are provided and the corresponding performance is discussed.

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“…In addition to that, output resistances of the current sources M3-M6 should be as high as possible, which is already demonstrated by [6]. It is important to note that systematic CMRR defines the maximum limit of CMRR under ideal conditions and will be reduced by the process related mismatches.…”

Section: Systematic Cmrrmentioning

confidence: 82%

“…For a cascode current mirror, similar to [6], and assuming equal sized mirror transistors, ∆g o (∆V in ) can be written as:…”

Section: Cmrr Limit Due To Electrode Offsetmentioning

confidence: 99%

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Effect of electrode offset on the CMRR of the current balancing instrumentation amplifiers

Yazıcıoğlu

Merken

Hoof

Research in Microelectronics and Electronics, 2005 PhD

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An integrated CMOS instrumentation amplifier with improved CMRR

Cited by 13 publications

References 8 publications

The method of the errors calculation from the input common-mode signal in the analog interfaces based on the differential difference operational amplifiers and the ways of their decrease

The method of the errors calculation from the input common-mode signal in the analog interfaces based on the differential difference operational amplifiers and the ways of their decrease

Wideband low-power current-feedback instrumentation amplifiers for bioelectrical signals

Effect of electrode offset on the CMRR of the current balancing instrumentation amplifiers

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