PC and microcontroller-based automated instrument for measuring frequency response of operational amplifier active filters

Authors

Ian Q. D. G. Fernandez ⋅ PH Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños
Nelio C. Altoveros ⋅ PH Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños

Abstract

An automated frequency response measurement device for testing operational amplifiers active filters was designed and constructed. The instrument was constructed to automatically generate sinusoidal signals, measure the corresponding amplitude response and output via personal computer (PC).
The device was designed to generate waveform signals from 10 Hz to 10 MHz with 10 points per decade. Calibration results show that the automation of the signal generator has percentage difference of 5% to its actual value with percentage deviation of less than 1%. However, errors on peak detection at higher frequencies and attenuation of signals of the signal generator reduce the frequency limit to 1 MHz.
A single pole high pass and low pass filter was implemented to test the function of the device. Results show that the device was able to generate bode plots similar to the ones generated using a function generator and oscilloscope. Standard deviation in the measurement of peak voltages was found to range from 0 to 15 mV.

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Issue

2007: Proceedings of the 25th Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2007-PA-14

Section

Poster Session PA

Published

2007-10-24

How to Cite

[1]

IQDG Fernandez and NC Altoveros, PC and microcontroller-based automated instrument for measuring frequency response of operational amplifier active filters, Proceedings of the Samahang Pisika ng Pilipinas 25, SPP-2007-PA-14 (2007). URL: https://proceedings.spp-online.org/article/view/SPP-2007-PA-14.