As shown in the figure, this is the circuit of the SGM4809 power amplifier. Is this an inverting operational amplifier? Is the magnification negative?
Savannah 发表于 October 28, 2020
The positive one is RF/R1
Luis 发表于 October 28, 2020
The gain is -Rf/Ri, and the negative sign only means that the phase is reversed by 180 degrees.
Carlos 发表于 October 28, 2020
There is a bias voltage of v+/2 and an inverted input signal
Isabel 发表于 October 28, 2020
First draw the AC equivalent circuit, and then calculate the amplifier magnification, so that it is correct
Alejandro 发表于 October 28, 2020
If it is still not clear, you can also use cadence to draw the above path and perform pspice simulation to verify the results
