Article
An improved model for the slewing behavior of opamps
Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN
IEEE Transactions on Circuits and Systems II Analog and Digital Signal Processing 11/1995; DOI: 10.1109/82.471400 Source: IEEE Xplore

Conference Paper: Operational amplifier power optimization for a given total (slewing plus linear) settling time
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ABSTRACT: A design procedure that determines the combination of linear settling time (i.e. gain bandwidth) and slew rate that minimizes an amplifier total power consumption, while complying with a given total settling time specification, is presented. The method is presented for a Miller OTA, but can be generalized to other architectures. The proposed approach also provides the optimum combination of the g<sub>m</sub>/I<sub>D</sub> ratios of the input and output transistors and the transistor design corresponding to this optimum of power consumption. It is shown that the application of fixed "rules of thumb" criteria for the assignment of the allowable linear settling and slewing periods leads to highly increased consumption. The method is based on a simple, design oriented model of the settling behavior that is also described in this paper. This model is checked against experimental results and the design procedure results are verified with SPICE simulations.Integrated Circuits and Systems Design, 2002. Proceedings. 15th Symposium on; 02/2002 
Conference Paper: Accurate transient response model for automatic synthesis of highspeed operational amplifiers
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ABSTRACT: This paper presents an accurate timedomain analysis of operational amplifiers' step response. Both slewing and linear settling phases are investigated in order to correct some discrepancies found in previous literature works. Moreover theoretical results are exploited developing a CAD tool for the automatic synthesis of highgain highspeed operational amplifiers. Transistor level simulations are performed with MOS lev. 2 and BSIM3v3 models for a telescopic OTA evaluated in the design of a 12b 200MS/s pipelined analogtodigital converter in a 0.35mum BiCMOS technology. The excellent agreement between predicted and simulated results are the consequence of an improved analysis of the slewingtolinear transitionCircuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on; 06/2006 
Article: Design of lowpower singlestage operational amplifiers based on an optimized settling model
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ABSTRACT: Settling behavior of operational amplifiers (opamps) is important in many analog signalprocessing applications. In this paper, the analysis of singlestage opamps based on settling time has been performed. A simple yet accurate model for the settling response of firstorder opamps that modifies conventional models is proposed to revise the equations. The presented approach leads to a new simple settlingbased design methodology for singlestage operational amplifiers. Circuitlevel simulations demonstrate the effectiveness of the procedure.Analog Integrated Circuits and Signal Processing 01/2009; 58(2):153160. · 0.55 Impact Factor
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