TITLE

Absolute-value circuit delivers high bandwidth

AUTHOR(S)
Mancini, Ron
PUB. DATE
July 2004
SOURCE
EDN;Jul2004 Supp, Vol. 49, p8
SOURCE TYPE
Trade Publication
DOC. TYPE
Article
ABSTRACT
Most absolute-value circuits have limited bandwidth and high component count, and they require several matched resistors. The circuit illustrated in the article uses three fewer components than most absolute-value circuits require, and only two of the resistors must have 1 percent tolerance to obtain one percent accuracy. This circuit's output voltage is an accurate representation of the absolute value of the input signal, and it is accurate for input signals containing frequencies as high as 10 MHz. Another advantage of this circuit is that it has a positive-voltage output, thus saving an analog inverter in most applications. This design uses a dual op amp to minimize parts count. Two op amps in a feedback loop tend to be unstable. The circuit's dynamic range is from the op amp's input offset voltage to the maximum output voltage. The excellent bandwidth performance results from combining high-frequency TLC072 op amp with a fast Schottky-barrier code. You can use higher frequency op amps to obtain better bandwidth results, but you must take care in the op-amp selection to avoid oscillation or reduced dynamic range.
ACCESSION #
14022706

 

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