TSV711/2/4 op-amp output resistor for stabilty

[Andrew Lohmann_2]

Posted on January 16, 2017 at 09:55

What is the lowest value of series resistor that I can use to maintain stability of this amplifier.

I would like to use a series resistor of 200R to 1K to a load that will have some variable capacitance. I need to use a low power op-amp, if you chose to suggest another..

#op-amp-stability

[Anthony BOIMOND]

Posted on January 19, 2017 at 18:17

Hello Andrew,

As you probably have seen, the TSV711 is tested with acceptable stability performance with pure capacitive load up to 200pF (this is illustrated in Figure 13, p13/29 of the datasheet).

For higher capacitive loads, a series resistor can be used, as you suggested.

The chart here below shows recommended values of series resistor to ensure stability for a given capacitor value.

Hope it can answer to your question.

Best regards,

Anthony

[Andrew Lohmann_2]

Posted on January 19, 2017 at 19:12

Thanks Anthony,

The op-amp is usable in my circuit with either 4K or 1K + 100nF. Your answer is approximately what I expected.