Suggest me a circuit design for power amplifier at 500Khz

[mnegm82]

Can any one suggest for me a circuit design for a power amplifier working in the 500KHz range and should produce about 300W. I suggest a swiched power MOSFET. Can any one garrantee this suggestion?

 

[Kral]

class ab power amplifier 500khz design

mnegm82,
For an operating frequency of 500 KHz, the switching rate (frequency) for a switching amplifier would be excessive. I would suggest a class B or AB linear amplifier, depending on your distortion requirements. The tradeoffs are:
Class B Higher distortion, higher efficiency
Class AB Lower distortion, lower efficiency. The closer
you get to class A, the distorion and efficiency
will be reduced.
Class A Lowest Distortion and Efficiency.
Both FETs and Junction transistors are suiotable for a linear design.
~
You must choose your heat sinks carefully to avoid excessive junction temperatures.
Regards,
Kral

 

[mnegm82]

class ab power amplifiers pdf

Thanks Karl. but the trend now is to switched mode power MOSFETS
to save power--> effeiciency up to 90% in contrast to linear whis in less than 50%
Allso SM is easier to control with logic circuits

 

[IanP]

crestaudio schematics

D-class basics:
http://www.irf.com/technical-info/appnotes/an-1071.pdf
D-class amplifier design:
**broken link removed**
**broken link removed**
D-class amplifier schematic:
**broken link removed**

Regards,
IanP

 

[echo47]

clase e rf mosfet

If you want DC-to-500 kHz bandwidth, then a switching amp is probably no good, as Kral says.

If your bandwidth is narrow, then search Google for class-E or class-F RF amp designs, or perhaps try something like this unusual clase-E/F amp that generates 1100 watts at 7 MHz:
**broken link removed**