Title :
Automatic measurement of frequency characteristics of operational amplifier circuits
Author :
Abe, Kôki ; Wakatsuki, Yôji ; Naraoka, Masato
Author_Institution :
Dept. of Comput. Sci. & Inf. Math., Univ. of Electro-commun., Tokyo, Japan
Abstract :
Laboratory experiments were developed for measuring the frequency characteristics of operational amplifier circuits using a personal computer with a data acquisition unit. A periodic rectangular wave, which is easily generated by a DA (digital/analog) converter, is applied to the circuit: then the steady-state response is digitized by an AD converter. Filon´s method was used for the numerical Fourier integration of the sampled response. The errors associated with the measurement of the frequency characteristics of an integrator were found to be less than 0.2 dB and 1 degrees in gain and phase, respectively, within the frequency range satisfying the condition that the gain be >or=0 dB.
Keywords :
computerised instrumentation; frequency measurement; microcomputer applications; operational amplifiers; Fourier integration; data acquisition; frequency characteristics; frequency measurement; gain; integrator; operational amplifier circuits; personal computer; phase; rectangular wave; steady-state response; Analog-digital conversion; Circuits; Computer errors; Data acquisition; Frequency measurement; Gain measurement; Laboratories; Microcomputers; Operational amplifiers; Steady-state;
Journal_Title :
Education, IEEE Transactions on
