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 ポストする October 28, 2020
The positive one is RF/R1
Luis ポストする October 28, 2020
The gain is -Rf/Ri, and the negative sign only means that the phase is reversed by 180 degrees.
Carlos ポストする October 28, 2020
There is a bias voltage of v+/2 and an inverted input signal
Isabel ポストする October 28, 2020
First draw the AC equivalent circuit, and then calculate the amplifier magnification, so that it is correct
Alejandro ポストする 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
