[Amps] Ribbon Beam Amplifiers

[Mark Marsden]

Hi Jeff

60dB, that's quite a spec! Is that open loop, or with cartesian
correction, or feed-forward? 
Current technology to do that (in the backed-off 10's of watts level) is
rather complex.

Mark

-----Original Message-----
From: jeff millar [mailto:wa1hco at adelphia.net] 
Sent: 15 August 2005 13:20
To: Mark Marsden
Cc: Amps at contesting.com
Subject: Re: [Amps] Ribbon Beam Amplifiers

I met with Chiping about a year ago to discuss this technology...It's
still very early in the game.
The key requirements for application to cellular networks include

    * Greater than 13 dB peak to average ratio (100W avg, 2 KW peak
output)
    * Intermod distortion products more than 60 dB down

If memory serves, the tubes and their RF cavity form an integral unit.

jeff, wa1hco

Mark Marsden wrote:

> 
>An interesting press cutting appeared on the tea-point notice board 
>here at work last week. It's about a new vacuum tube device called 
>"Ribbon Beam Amplifier (RBA)" developed by MIT for 3G base station PAs,

>check out  http://web.mit.edu/newsoffice/2005/wireless.html
>
>73 Mark G4AXX
>_______________________________________________