AM modulation

[Mike O'Dell]

almost all the cellular base-station PAs are Doherty amplifiers these 
days. they have been the savior of both DMOS RF transistors and the
cellular industry in general.

	-mo


On 2/16/10 7:37 PM, bbruhns at erols.com wrote:
> That's right, that high-efficiency linear with the combiner that got increased power from the carrier tube on modulation peaks was the Doherty amp, and it was not designed by Terman as I misrecalled, but only described by him.
>
> Communications engineers are also thinking about these amplification and modulation techniques today because radio systems are using methods that involve variable power, and in some cases also rapidly varying amplitude, and the old efficiency issue is still with us.  The simple method of reducing drive to reduce the output of an FM power amp results in poor efficiency, and that means higher power consumption, shorter battery life, more heat, etc.
>
>     Bob, WA3WDR
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: rabruner at aol.com
> Date: Tue, 16 Feb 2010 19:08:20
> To:<tacos at amrad.org>
> Subject: Re: AM modulation
>
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"Of course it's hard!
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