An approach to test the open-loop parameters of feedback amplifiers

被引：20

作者：

Giustolisi, G ^{[1
]}

Palumbo, G ^{[1
]}

机构：

[1] Univ Catania, Dipartimento Elettr Informat & Sistemist, I-95125 Catania, Italy

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-FUNDAMENTAL THEORY AND APPLICATIONS | 2002年 / 49卷 / 01期

关键词：

close-loop systems; feedback amplifiers; frequency measurement; open-loop systems; phase measurement;

D O I：

10.1109/81.974877

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A novel method for determining open-loop parameters, such as unity-gain frequency and phase margin, in feedback amplifiers is given. It is based on relations between open-loop and closed-loop configurations and is very useful for evaluating the above parameters in a unity-gain amplifier from a simple measure of its closed-loop 3-dB cutoff frequency and the respective phase for a given feedback factor, beta. The approach is validated by simulations of an ideal amplifier and of a real OTA. Moreover, measures carried out for a muA-741 operational amplifier show a percentage error between real and calculated values lower than 2%.

引用

页码：70 / 75

页数：6

共 14 条

[1]

Allen P. E., 1987, CMOS Analog Circuit Design

[2] A SIMPLE METHOD TO ESTIMATE THE RATIO OF THE 2ND POLE TO THE GAIN-BANDWIDTH PRODUCT OF MATCHED OPERATIONAL-AMPLIFIERS [J].

AWAD, SS .

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 1990, 39 (02) :429-432

[3]

GIUSTOLISI G, IN PRESS IEEE J SOLI

[4]

Gray P. R., 1993, ANAL DESIGN ANALOG I

[5]

Gregorian R., 1986, Analog MOS Integrated Circuits for Signal Processing

[6]

Laker K. R, 1994, DESIGN ANALOG INTEGR

[7] STABILITY OF PHASE-LEAD INTEGRATOR [J].

MARTIN, K ;

SEDRA, AS .

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS, 1977, 24 (06) :321-324

[8]

NATARAJAN S, 1991, IEEE T INSTRUM MEAS, V40, P43

[9] A 1.5-V high drive capability CMOS op-amp [J].

Palmisano, G ;

Palumbo, G ;

Salerno, R .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 1999, 34 (02) :248-252

[10] Analysis and compensation of two-pole amplifiers with a pole-zero doublet [J].

Palmisano, G ;

Palumbo, G .

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-FUNDAMENTAL THEORY AND APPLICATIONS, 1999, 46 (07) :864-868

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