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How to choose two tones for IP3 simulation in Cadence Virtuoso for Class E power amp?

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sharethewell

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How to choose two tones for IP3 simulation (PSP+PAC) in Cadence Virtuoso for Class E power amplifier operating at 433MHz?

Shall I set 10MHz as fundamental frequency and choose 420MHz and 450MHz as two tones? Thanks.
 

For IP3, you should use PSS and a generator with 2 tones.
For 433 MHZ, you can choose 430 and 433 MHz so your beat frequencies will be 427 MHz and 436 MHz that are in-band around your main carriers..
Don't drive your circuit too strong otherwise the simulation will not be correct. Drive fairly for instance until P1dB-20dB ..
 

BigBoss said:
For IP3, you should use PSS and a generator with 2 tones.
For 433 MHZ, you can choose 430 and 433 MHz so your beat frequencies will be 427 MHz and 436 MHz that are in-band around your main carriers..
Don't drive your circuit too strong otherwise the simulation will not be correct. Drive fairly for instance until P1dB-20dB ..
Click to expand...

The beat frequency is the greatest common divisor of two input tones, right? How come it is 427MHz and 436MHz? Since the 3rd harmonics are 2f1-f2 and 2f2-f1, so you probably mean the 3rd harmonics right? In the PSS setup window, if the beat frequency is calculated, it is 1MHz in Cadence Spectre.
 

I mean 2F1-F2 and 2F2-F1 being as "beat frequencies"..
In my case, minimum common frequency will be of course 3MHz.
You can also do a transient simulation then DFT, that is more accurate...
 

Class E is very nonlinear. It should be only used for constant amplitude signals such as MSK and generating energy for industrial processes.
 

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