[Amps] Class E amd and MRF492

[Will Matney]

Bill,

I think thats called losses, losses, losses aint it?

Best,

Will

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>On 3/9/05 at 9:05 AM Bill Fuqua wrote:
>
>>Here is the problem.
>>It seems to me that using either system effectively reduces efficiency of 
>>the amplifier.
>>        The Cartesian loop system modifies the input signal to linearize 
>>the amplifier this changes the amplifiers efficiency. So the benefit of 
>>high efficiency goes out the window when using this system with SSB.
>>        The polar loop system is a variation of the DAF amplifier. We
>have 
>>had lots of discussions about that here. With a method of  compensating
>>for 
>>phase shift due to impedance changes due to variations in the modulated 
>>supply voltage. Also, I think the efficiency will also suffer at low or 
>>intermediate signal levels.
>>
>>Check out:
>>
>>http://www.ece.ucdavis.edu/~spbruss/research/linearizer_methods_overview.pdf
>>
>>At 03:02 PM 3/8/2005 -0500, ToddRoberts2001 at aol.com wrote:
>>>In a message dated 3/8/2005 12:48:58 PM Eastern Standard Time,
>>G3rzp at aol.com
>>>writes:
>>>How do you make them linear? Can you maintain the efficiency if you use
>>>polar or cartesian loop linearising?
>>>
>>>73
>>>
>>>Peter G3RZP
>>>
>>>I don't think it is possible to make a Class E amplifier linear in the
>way
>>>that a Class AB amplifier is linear. One practical way to use a Class E
>>>amplifier to amplify SSB is to configure it as an EER - Envelope 
>>>Elimination and
>>>Restoration amplifier. Dr. Fred Raab has done much good research and
>>written
>>>several papers on the EER technique. 73 Todd WD4NGG
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>>
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