High-power varactors

[Andre Kesteloot]

Bob Bruninga wrote:

>On Sat, 29 Nov 2003, Andre Kesteloot wrote:
>
>  
>
>>The idea of using the drain-gate capacitance of biased-off power MOSFETs
>>as high power varactors is interesting.
>>    
>>
>
>What is it about varactors that makes them better than just a diode as a
>high power mixer?
>  
>
the idea of the article was to suggest the use of power MosFETs, not as 
mixing diodes necessarily, but as variable capacitors (for remote-tuning 
purposes) by means of applying a DC voltage to vary the input 
capacitance of the MosFET (which is quite high when turned off) .
73
André
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