Thank you for the lesson. But I don't understand, where is a limit for the feedback resistor? Can we, e. g. use 1G resistor for very low-current sources? Or we will face bandwith narrowing? I know Op Amp LTC6268-10 with the GBP of a 4GHz, but in a datasheet there is bandwith of only 100 MHz for I->V converter with a feedback of 20k (such a graph is at the first page of the datasheet).
The problem with using very large feedback resistors is that both noise and DC offset are proportional to R. Big R means more noise and more DC offset at the output. Also, parasitic capacitances become more of an issue. Calculate the fc for a mere 0.1 pF across a 1 G resistor!
Thanks for the great video Professor, looking forward to more!
Prof Fiore! You're the best!
thank you
Thankyou.
Thank you for the lesson. But I don't understand, where is a limit for the feedback resistor? Can we, e. g. use 1G resistor for very low-current sources? Or we will face bandwith narrowing?
I know Op Amp LTC6268-10 with the GBP of a 4GHz, but in a datasheet there is bandwith of only 100 MHz for I->V converter with a feedback of 20k (such a graph is at the first page of the datasheet).
The problem with using very large feedback resistors is that both noise and DC offset are proportional to R. Big R means more noise and more DC offset at the output. Also, parasitic capacitances become more of an issue. Calculate the fc for a mere 0.1 pF across a 1 G resistor!
Which is the program that you used?
TINA-Ti. from ti.com