- #1
Natalie Johnson
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Hi,
I have measured a Transfer function curve for an amplifier, showing Input power vs output power. It shows non-linear increases for a portion of the transfer curve (at higher input power).
I also measured 3rd order intermodulation products during the input power range where it gives non linear output. I measured 3 Amplifiers.
On one Amplifier, the ratio of gradients was 3:1 (intermodulation power vs input power : output power vs input power) but the other two were not the theoretical 3:1 . They were 6:1 and 7:1. But from all three I obtained the correct Third Order Incercept as the manufacturers datasheet.
Why might amplifiers have intermodulation higher than the theoretical 3:1 ? If they cant, it must be an error with my measurements?
Thanks
I have measured a Transfer function curve for an amplifier, showing Input power vs output power. It shows non-linear increases for a portion of the transfer curve (at higher input power).
I also measured 3rd order intermodulation products during the input power range where it gives non linear output. I measured 3 Amplifiers.
On one Amplifier, the ratio of gradients was 3:1 (intermodulation power vs input power : output power vs input power) but the other two were not the theoretical 3:1 . They were 6:1 and 7:1. But from all three I obtained the correct Third Order Incercept as the manufacturers datasheet.
Why might amplifiers have intermodulation higher than the theoretical 3:1 ? If they cant, it must be an error with my measurements?
Thanks
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