Journal ArticleDOI
An improved frequency compensation technique for CMOS operational amplifiers
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TLDR
In this paper, a two-stage CMOS operational amplifier is proposed to provide stable operation for a much larger range of capacitive loads, as well as much improved V/SUB BB/ power supply rejection over very wide bandwidths for the same basic operational amplifier circuit.Abstract:
The commonly used two-stage CMOS operational amplifier suffers from two basic performance limitations due to the RC compensation network around the second gain stage. First, it provides stable operation for only a limited range of capacitive loads, and second, the power supply rejection shows severe degradation above the open-loop pole frequency. The technique described provides stable operation for a much larger range of capacitive loads, as well as much improved V/SUB BB/ power supply rejection over very wide bandwidths for the same basic operational amplifier circuit. The author presents a mathematical analysis of this new technique in terms of its frequency and noise characteristics followed by its implementation in all n-well CMOS process. Experimental results show 70-dB negative power supply rejection at 100 kHz and an input noise density of 58 nV/(Hz)/SUP 1/2/ at 1 kHz.read more
Citations
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Journal ArticleDOI
A Design of LDO(Low Dropout Regulator) with Enhanced Settling Time and Regulation Property
Kyung-Soo Park,Jea-Gun Park +1 more
TL;DR: In this article, a low dropout regulator using two OPAMPs and two signal paths is proposed to improve the regulation property and settling time of LDO, where OPAMP where is used in the path which qualities DC gain on a large scale, bandwidth designed narrowly.
INVITED PAPER Special Section on Analog Circuits and Related SoC Integration Technologies Phase Compensation Techniques for Low-Power Operational Amplifiers
Rui Ito,Tetsuro Itakura +1 more
TL;DR: The conventional and the improved Miller compensations and the phase compensation by introducing a new zero are dicussed for low-power operational amplifiers for analog and mixed-signal circuits.
Book ChapterDOI
8 – Power supplies and PSRR
TL;DR: In this paper, the effects of inadequate powersupply rejection ratio (PSRR) in a typical Class-B power amplifier with a simple unregulated supply may be twofold, i.e., inadequate power supply rejection ratio and insufficient heat sinking.
Proceedings ArticleDOI
A capacitor-free feed-forward compensated single-stage merged topology fully-differential CMOS folded cascode amplifier
S.M.R. Hasan,N. Ula +1 more
TL;DR: A capacitor-free feed-forward compensation technique for single-stage CMOS folded-cascode operational transconductance amplifiers (OTA) using a "merged CMOS cascode transconductors" topology to ensure optimum step response for the feedback amplifier in switched-capacitor signal processing applications.
References
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Journal ArticleDOI
MOS operational amplifier design-a tutorial overview
Paul R. Gray,Robert G. Meyer +1 more
TL;DR: In this paper, an overview of current design techniques for operational amplifiers implemented in CMOS and NMOS technology at a tutorial level is presented, focusing on CMOS amplifiers because of their more widespread use.
Journal ArticleDOI
A high performance low power CMOS channel filter
TL;DR: In this article, a new CMOS PCM channel filter is described, which includes transmit and receive filters on a single die, and the chip displays an idle-channel noise of typically 0 dBrnC0, a power supply rejection ratio of 40-50 dB at 1 kHz, and a fully operational power dissipation of only 35 mW.
Journal ArticleDOI
High-performance NMOS operational amplifier
TL;DR: A high performance operational amplifier 300 mil/SUP 2/ in area has been designed and fabricated in a standard n-channel silicon-gate enhancement/depletion MOS process.
Journal ArticleDOI
A single-chip CMOS PCM codec with filters
TL;DR: In this paper, a complete PCM codec using charge redistribution and switched-capacitor techniques is described, implemented in a two-level polysilicon CMOS technology using 23.4 mm/SUP 2/ of active area.
Journal ArticleDOI
Low-Power High-Drive CMOS Operational Amplifiers
TL;DR: Low-power CMOS op amps with high-drive capability and good settling characteristics are described, suitable for applications in such systems as charge-redistribution codecs and switched-capacitor filters.