A new multipath amplifier design technique for enhancing gain without sacrificing bandwidth

Schlarmann, M.E.; Lee, E.K.F.; Geiger, R.L.

doi:10.1109/iscas.1999.780836

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…The design strategy is to place the LHP zero and the closed-loop dominant pole, which are given by (10) and (11), at the same frequency. The bias currents and aspect ratios of the second and feedforward stage are adjusted such that .…”

Section: Circuit Realizationmentioning

confidence: 99%

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A robust feedforward compensation scheme for multistage operational transconductance amplifiers with no Miller capacitors

Thandri

Silva-Martínez

2003

IEEE J. Solid-State Circuits

194

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A multistage operational transconductance amplifier with a feedforward compensation scheme which does not use Miller capacitors is introduced. The compensation scheme uses the positive phase shift of left-half-plane (LHP) zeroes caused by the feedforward path to cancel the negative phase shift of poles to achieve a good phase margin. A two-stage path increases further the low frequency gain while a feedforward single-stage amplifier makes the circuit faster. The amplifier bandwidth is not compromised by the absence of the traditional pole-splitting effect of Miller compensation, resulting in a high-gain wide-band amplifier. The capacitors of a capacitive amplifier using the proposed techniques can be varied more than a decade without significant settling time degradation. Experimental results for a prototype fabricated in AMI 0.5-m CMOS process show dc gain of around 90 dB and a 1% settling time of 15 ns for a load capacitor of 12 pF. The power supply used is 1.25 V.

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Section: Circuit Realizationmentioning

confidence: 99%

“…Recently, active feedforward techniques have been used for the design of multistage amplifiers. In [11], a theoretical analysis on the effects of feedforward networks is presented, and in [12], the technique is used for the design of low-frequency instrumentation amplifiers.…”

Section: Introductionmentioning

confidence: 99%

A robust feedforward compensation scheme for multistage operational transconductance amplifiers with no Miller capacitors

Thandri

Silva-Martínez

2003

IEEE J. Solid-State Circuits

194

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“…It was not suitable for applications that required fast settling because of the presence of low frequency dipoles (closely spaced pole-zero pairs are often referred to as c/owMe# but are more aptly described by the term <#po/&y). In [17] it was shown how an architecture similar to…”

Section: Cascaded Structuresmentioning

confidence: 99%

“…There is at least one multistage amplifier compensation technique [28,29] that does not sacrifice the gain bandwidth product of an amplifier in exchange for achieving stability. Although the technique results in an amplifier that has a gain-bandwidth product that is as large as can be achieved with a single stage amplifier, the resultant structure is still not suitable for fast settling applications because it has a poor transient response.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we present a generalization of the technique to cover amplifiers composed of an arbitrary number of stages. Although we focus specifically on the multistage multipath compensated amplifier architecture proposed in [28], the technique is generally applicable to other architectures that suffer from low-frequency dipoles as well.…”

Section: Introductionmentioning

confidence: 99%

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Multipath feedforward compensated amplifier, related dipole (doublet) compression technique, and other topics

Schlarmann

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The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleed-through, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.

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A compensation technique using floating gate transistors

Perez-Torres

Muñiz-Montero

Díaz-Sánchez³

(ICEEE). 1st International Conference on Electrical and Electronics Engineering, 2004.

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A new multipath amplifier design technique for enhancing gain without sacrificing bandwidth

Cited by 9 publications

References 6 publications

A robust feedforward compensation scheme for multistage operational transconductance amplifiers with no Miller capacitors

A robust feedforward compensation scheme for multistage operational transconductance amplifiers with no Miller capacitors

Multipath feedforward compensated amplifier, related dipole (doublet) compression technique, and other topics

A compensation technique using floating gate transistors

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