concept quesiton: open loop gain of opamp for simulation

[ffsher100]

Hi Lvw,
the large resistor & cap. DC feedback is good idea.

 

[ffsher100]

Hi Lvw,

Example: Rf=100 kohms, C=100 Farad result in a lower cut-off frequency of app. 16 mHz.

the cut-off frequency in example should: 1/(10^5 * 10^2 * 2*pi)= 10^(-7) * 0.16= 16nHz, not 16mHz

 

[LvW]

Hi Lvw,

the cut-off frequency in example should: 1/(10^5 * 10^2 * 2*pi)= 10^(-7) * 0.16= 16nHz, not 16mHz

Hi ffsher100,
the R-C feedback creates an active highpass - H(s)=Amax/(1+s/RC) - with a maximum gain Amax that depends on the opamp type. Thus, you have to multiply with 1E5...1E6.