Though I am enough experienced with different kinds of Electronics Design, the
RF is completely new for me.
I need to design a 50 MHz amplifier, working on a 50 Ohm load, with output power in range of 20...50 W. Please, recommend how to start, any references, etc.
Thanks,
It does not to be linear, I think C/D class is enough. Supply voltage 24V or 12V.
As an input I want to use a standard 50MHz quartz oscillator, for example Epson GS-8002.
Attached is a diagram of wideband D-class amplifier which can be driven of TTL levels.
Supply can be 24 for power stage and 12V for pre-amplifier.
If you like this concept I can give you more details on this circuit.
Regards,
IanP
Thank you. It is just what I need for the beginning. Sure I need more information about active (transistors and diodes) and passive (L and C) components.
Here is the list of transistors:
npn: http://www.fairchildsemi.com/ds/2N/2N3904.pdf
npn--pnp:
**broken link removed**
**broken link removed**
power npn: **broken link removed**
Diode = 1N4148 or similar
1st toroidal:
primary=5
Secondary=2 x 2
2nd toroidal:
primary(s)=2 x 4
secondary=4
You will have to experiment with the type of toroidal cores used in wideband transformers applications, have a look in here:
**broken link removed**..
Regards,
IanP
Hier is info on toroidal cores:
Small core: **broken link removed**
Big core: **broken link removed**
Attached picture: 20MHz fm amplifier.
Regards,
IanP