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AN-763

更新时间： 2024-11-30 12:50:55

品牌	Logo	应用领域
亚德诺 - ADI		运算放大器
页数	文件大小	规格书
4页	348K
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Dual Universal Precision Op Amp Evaluation Board

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AN-763 数据手册

AN-763

APPLICATION NOTE

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel: 781/329-4700 • Fax: 781/326-8703 • www.analog.com

Dual Universal Precision Op Amp Evaluation Board

by Giampaolo Marino and Steve Ranta

The EVAL-PRAOPAMP-2R/2RU/2RM is an evaluation board

that accommodates dual op amps in SOIC, TSSOP, and

MSOPpackages. Itprovidestheuserwithmultiplechoices

and extensive ﬂexibility for different application circuits

and conﬁgurations.

Choosing equal capacitor values minimizes the sensitivity

and also simpliﬁes the expression for f_Cto

(3)

The value of Q determines the peaking of the gain versus

frequency (generally ringing in time domain). Commonly

chosen values for Q are near unity.

This board is not intended to be used with high frequency

componentsorhighspeedampliﬁers.However,itprovides

the user with many combinations for various circuit types,

including active ﬁlters, instrumentation ampliﬁers, com-

posite ampliﬁers, and external frequency compensation

circuits. Several examples of application circuits are given

in this application note.

SettingQ=1/÷2yieldsminimumgainpeakingandminimum

ringing. Use Equation 3 to determine the values for R1 and

R2. For example, set Q = 1/÷2, R1/R2 = 2 in the circuit ex-

ample, and pick R1 = 5 k and R2 = 10 k for simplicity.The

second stage is a low-pass ﬁlter whose corner frequency

can be determined in a similar fashion:

TWO STAGE BAND-PASS FILTER

680pF

R3 = R4 = R

10k

V–

33k

OUT

10nF 10nF

1/2 OP2177

and

Q = 1/ 2

1/2 OP2177

330pF

–

V+

20k

V+

HALF-WAVE, FULL-WAVE RECTIFIER

Figure 1. KRC Filter

Rectifying circuits are used in a multitude of applications.

One of the most popular uses is in the design of regulated

power supplies where a rectiﬁer circuit is used to convert

an input sinusoid to a unipolar output voltage.There are

somepotentialproblemsforampliﬁersusedinthismanner.

When the input voltageV_INis negative, the output is zero.

When the magnitude of V_INis doubled at the input of the

op amp, this voltage could exceed the power supply volt-

age which would damage the ampliﬁers permanently.The

op amp must come out of saturation whenV_INis negative.

This delays the output signal because the ampliﬁer needs

timetoenteritslinearregion.TheAD8510/AD8512/AD8513

haveveryfastoverdriverecoverytime, whichmakesthem

agreatchoiceforrectiﬁcationoftransientsignals.Thesym-

metry of the positive and negative recovery time is also

very important in keeping the output signal undistorted.

The low offset voltage and high CMRR makes the OP2177

a great choice for precision ﬁlters such as the KRC ﬁlter

shown in Figure 1. This particular ﬁlter implementation

offers the ﬂexibility to tune the gain and the cut-off fre-

quency independently. Since the common-mode voltage

into the ampliﬁer varies with the input signal in the KRC

ﬁlter circuit, a high CMRR ampliﬁer such as the OP2177

is required to minimize distortion. Furthermore, the low

offsetvoltageoftheOP2177allowsawiderdynamicrange

when the circuit gain is chosen to be high.

ThecircuitinFigure1consistsoftwostages.Theﬁrststage

is a simple high-pass ﬁlter whose corner frequency f_Cis

2π C1C2R1R2

(1)

(2)

and whose

Q = K

K = is the dc gain.

REV. B

12 3 4

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