2F8725D a CATV amplifier -network matching

[molloy]

CATV amplifier

hello,
I need to use the 2F8725D a CATV amplifier in a final stage for a DVBT driver (about 20dBm power output in VHF and UHF band and so in two band from 170 to 230MHz and 470 to 860MHz). The Zin and Zout in our case is 50ohm while the CATV is 75ohm. According to you is it possible simple with a network matching (resistive at the input and reactive at the output)?
regards

 

[VSWR]

Re: CATV amplifier

See this posting:

 

[Chinaski]

Hello
I'll try to resume the other post in just three items

1) Your design is broadband so forget LC or quarter wavelength circuits.
2) Your insertion losses should be low so forget resistive matching (I think it makes no sense to put an attenuator after an amp)
3) Go for a transformer with a 1.5 ohm ratio (for example minicircuits 1.5 series)

Good luck

 

[molloy]

Thank you
i will try (otherwise i will use a GAN wideband amplifier)
regards

 

[g579]

At the input you can try a resistive match, if you have spare gain of the system.