Hi Everyone, I recently started a project to measure the voltage across a 100 Ohm resistor connected in series with a 1uF capacitor. Initially I drove it with a 1Khz sine wave fed through a good old LM358 from a function generator and it performed well up to about 2Khz before the LM358 started to distort its output. It was still sort of usable up to about 3Khz.
Then swapped it with a TL072 I had on the bench, and discovered it would distort its out put at just over 1Khz. As I also had handy a LF353, I found it was the same as the TL072. Looking at the data sheet all op amps are capable of driving from 20mA to 40mA at the output, so I’m wondering why were they distorting at such a low frequency, and what does it take to drive such a load at anything up to a couple of hundred Khz?
Thanks
kvresto
