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How to calculate the magnification of this audio power amplifier?

Hardware design
octubre 28, 2020 by Gabriel 1592

As shown in the figure, this is the circuit of the SGM4809 power amplifier. Is this an inverting operational amplifier? Is the magnification negative?

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Savannah Publicado en October 28, 2020

The positive one is RF/R1

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Luis Publicado en October 28, 2020

The gain is -Rf/Ri, and the negative sign only means that the phase is reversed by 180 degrees.

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Carlos Publicado en October 28, 2020

There is a bias voltage of v+/2 and an inverted input signal

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Isabel Publicado en October 28, 2020

First draw the AC equivalent circuit, and then calculate the amplifier magnification, so that it is correct

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Alejandro Publicado en 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

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