Instrumentation Amplifier using Robust Rail-to-Rail Operational Amplifiers with gm Control

Prior, Cesar Augusto; Vieira, Filipe Costa Beber; Rodrigues, Cesar Ramos

doi:10.1109/mwscas.2006.382231

Cited by 12 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To meet rail-to-rail swing at the op amp's output, a cascode output stage based on topology is used [10]. This stage allows the current copying to the following mirroring and summation stages with no reduction in the voltage swing.…”

Section: I/o Rail-to-rail Op Ampsmentioning

confidence: 99%

“…To solve the problem of limited IA output swing, due to the poor operation of the current mirrors concerning its swing voltage, reported by [10], the op amp C was configured as a transconductance amplifier. Then, a virtual ground is created at the output of the two current mirrors.…”

Section: Instrumentation Amplifiermentioning

confidence: 99%

“…A solution to improve V i,cm is proposed in [10], but the output swing is affected by the current mirror limited swing. In this paper, we use a transconductance amplifier at instrumentation amplifier (IA) output to overcome this problem.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Current mode instrumentation amplifier with rail-to-rail input and output

Vieira

Prior

Rodrigues

et al. 2008

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

This paper presents the results from an investigation on the implementation of Current Mode Instrumentation Amplifiers (CMIAs) with rail-to-rail operational amplifiers (op amp) with a gm control circuit. The objective of employing rail-to-rail op amps in the implementation of a CMIA is the improvement of the common-mode operation range. The enhancement of the input common mode range (ICMR) is obtained using op amps with a rail-to-rail input stage followed by a cascode-based output stage. A prototype of the CMIA was implemented in standard 0.6 lm XFAB CMOS technology. Test results showed that the CMIA common mode range was extended but with moderated CMRR. To minimize this issue the amplifier was re-designed and sent to fabrication. Simulations with the components variations included were performed and showed the enhancement of the CMRR can be expected.

show abstract

Section: I/o Rail-to-rail Op Ampsmentioning

confidence: 99%

Section: Instrumentation Amplifiermentioning

confidence: 99%

See 1 more Smart Citation

Current mode instrumentation amplifier with rail-to-rail input and output

Vieira

Prior

Rodrigues

et al. 2008

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

show abstract

“…To meet rail-to-rail swing at the op amp's output, an output stage based on cascode topology is used [7]. This stage is very efficient to copy its current away to the Op amp, to the following mirroring and summation at the IA level.…”

Section: I/o Rail-to-rail Op Ampsmentioning

confidence: 99%

“…A solution to improve V i,cm is proposed in [7], but the output swing is affected by the current mirror limited swing. In this paper, we use a transconductance amplifier at Instrumentation Amplifier (IA) output to overcome this problem.…”

Section: Introductionmentioning

confidence: 99%

Current mode instrumentation amplifier with rail-to-rail input and output

Vieira

Prior

Rodrigues

et al. 2007

Proceedings of the 20th Annual Conference on Integrated Circuits and Systems Design

View full text Add to dashboard Cite

A Current Mode Instrumentation Amplifier with rail-to-rail input and output is presented. It is based on constant gm input stages, and cascode output stages. Although this CMIA structure has a good Input Common Mode Voltage, it suffers from a poor output swing, due to the limitation imposed by the current mirrors. This problem is overcome by using a transconductance amplifier as output block. The circuit was designed to 0.6µm XC06 XFAB CMOS technology. Post layout simulations on the extracted circuit net-list provide a bandwidth about 70 kHz (-3dB), and a CMRR higher than 160dB, for a dc gain set to 66 dB. The power consumption is 149µW at ±1.5V.

show abstract