A Compensation Technique for Two-Stage Differential OTAs

In this brief, a frequency compensation method for operational transconductance amplifiers is proposed, which poses no power overhead compared to Miller compensation, while improving the 3-dB bandwidth, the unity gain frequency, and the slew rate. The technique employees positive feedback to introdu...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2014-08, Vol.61 (8), p.594-598
Main Authors: Abdulaziz, Mohammed, Tormanen, Markus, Sjoland, Henrik
Format: Article
Language:English
Subjects:
active filter
Bandwidth
Capacitance
Capacitors
Circuits
Circuits and systems
CMOS technology
Compensation
Design engineering
Electrical Engineering, Electronic Engineering, Information Engineering
Elektroteknik och elektronik
Engineering and Technology
Gain
Half planes
low pass filter
low power electronics
Mathematical model
operational amplifier
Poles and zeros
RF receivers
Robustness
Teknik
Transconductance
Unity
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Summary:In this brief, a frequency compensation method for operational transconductance amplifiers is proposed, which poses no power overhead compared to Miller compensation, while improving the 3-dB bandwidth, the unity gain frequency, and the slew rate. The technique employees positive feedback to introduce an extra left half plane zero to cancel a pole. The phase margin shows good robustness against process and temperature variations. The proposed technique poses no design constraints on the transconductance or capacitor values, which makes it attractive for low-power applications with low area overhead.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2014.2327475