Hi Raj.
Quote: For example in any voltage feedback amplifiers GBW is fixed for a design and gain and 3dB bandwidth can trade each other, where you have written on the contrary.
The following picture is a part of OPA820 spec. OPA820 is a voltage feedback amplifier. If we assume GBW is fixed, gain and 3dB bandwidth can trade each other, how do I explain the value of small signal bandwidth?
It is 800 MHz if G=1, V
O=0.1V
PP, R
F=0Ω. So the GBW is 800 MHz. Right?
And it is 240 MHz if G=2, V
O=0.1V
PP. So GBW becomes 480 MHz.
Even GBW decreases to 280 MHz if G≥20.
I am reading some literature about current feedback amplifier and voltage feedback amplifier. The GBW is one issue that confused me.
Thanks very much. What do you think about it?
Yawei