high IP3 LF Gain Block

If I wanted a 10-300 MHz gain block with an oip3 of +50 dBm, how would you suggest I do it? I was thinking of a very linear FET with transnformer feedback. Which FETs have the most linearity with lower supply voltage?

I was also wondering about applying microwave techniques, such as a feedforward amp block diagram, but at these low frequencies. The harmonic amp could be a simple op amp, for instance.

This wide frequency range is not an easy task. Can use a push-pull Norton amplifiers as in the example attached. Can get better than +50dBm OIP3 using a pair of medium-power high-frequency BJT's. Circuit like this can work between 3MHz and 150MHz. Would be a real challenge to make it work at higher frequencies, mainly due to the roll-off characteristic of the transformers. Lowering the Vcc definitely will affect the OIP3.

If NF is not a concern, you may use RC fed-backed GaAs pHEMT due to their pretty linear characteristics.Transformers may have some nonlinear issues under especially high input/output levels.

Thanks guys. I too was thinking about non-transformer feedback. THe push pull...Probably need those input/output transformers though. I'll do some experiments and report back.