Idealized Baseband Amplifier with Nonlinearity and Noise Example question

Hello everyone,

I am learning on the RF blockset on how to use this block properly.

After read through this example documentation. I have some question on this.

1) How the amplitude of 2 baseband tone is exactly -20 and -25 dBm respectively?

On that block it using 10^((-20-30)/20) for -20 dBm amplitude and 10^((-25-30)/20) for -25 dBm.

What is the fomular that being used?

2) What is the purpose of "Sum" block in this example?

Best Regards,

Fumihiko Sato

Answer 1

[Zaid Jilani]

1. You can check the following documentation for more details on this :https://www.mathworks.com/help/simrf/ug/power-in-simulink-sources-and-signals.html#d123e16001
2. The Amplifier block only accepts a vector input. The Sum block combines the two baseband signals into a vector length equal to the samples per frame in the DSP Sine Wave block. You can refer to the following documentation for more information. https://www.mathworks.com/help/simrf/ug/rf-baseband-amplfier-with-nonlinearity-and-noise.html?s_tid=answers_rc2-1_p4_Topic

[Fumihiko Sato]

Thank you zaid for your help :)