OPA615: OPA615

Yes, because of its ultra low junction capacitance.

Kai

Thank you klaas69. In my circuit, i have 10ns pulses which has differenf amplitude depending rise and fall times of the AGC_In signal. And with these signals, i want to measure the peak value of my signal (AGC_Out). My frequency is 20KHz .My circuit is below.

Is there any mistake in my circuit?

Hi User,

can you show how the pulses look like? Do you have a scope plot?

Kai

Here is the inverted signal.We will use inverted of this signal as AGC_In.

Hi User,

could work:

user_opa615.TSC

The simulation shows the performance for several amplitudes of input signal.

And here the small signal performance:

Kai

Thank you Kai. As i see in the graphic, the pulse width is about 170ns. Is this the minimum pulse width or can i apply 10ns pulse?

The OPA615 isn't so well suited for 10ns pulses:

But the OPA860 could do:

user_opa860.TSC

In any case, with such fast pulses the peak value versus amplitude linearity will degrade.

Kai

Thank you for your OPA860 circuit. This is better for me. Does your design require one or two OPA860?

And the last question I don't know to take multioutput at TINA (100mV, 200mV, etc) Could you write me how to do?