I read about distributed amplifiers. I know they are used in MMICs, but I wonder whether it would be possible to build a distributed amplifier with discrete components. In my opinion, it would have the advantage that the output power of the amplifier is distributed to the individual transistors. Would it be possible to construct a distributed amplifier with discrete transistors, say, for 2 GHz?
Electronic – Discrete Distributed Amplifier
amplifierRF
Related Solutions
If you want something simple to get started you could build this class A amplifier:
(from this excellent site).
\$R_E\$ stabilizes the DC setting, the bypass capacitor \$C_E\$ is needed to allow an AC signal to change the output, otherwise \$R_E\$ would try to keep the output constant.
A class A amplifier is not very efficient. There will always flow a current through it to keep the output at Vcc/2.
An ordinary audio power amplifier should be able to handle your application. For example, an amplifier rated for 100 watts into 8 ohms has to supply an output voltage of about 28 VRMS. This voltage, with a 40 ohm load, will develop 20 watts. With a 20 ohm load, it could provide 40 watts. There should be no problem using a higher impedance load with typical audio power amplifiers. The only drawback is that you need an amplifier with a higher power rating than you need for your load.
Best Answer
Discrete pad and lead inductance makes this impossible but with well controlled impedances and 3D shielded isolation , MMIC use is acceptable to 5GHz and up with more skill. ref