Re: RF power chain mods and improvements..


Howard Fidel
 

The MMIC has a absolute maximum voltage of 4.5 VDC. Assuming you use a transformer (actually you must to get the drive level you need for the output stage) you an only use a +2 volt supply for the device for a 4 v p-p swing. So you need at least  1:2 step up transformer so the driver needs to source more current to drive it. I am completing the design of a driver that is flat to 30 MHz and will post it soon. It uses a current driver and a dual opamp replacing everything from VR1 to T10.

Howard

On 6/8/2018 11:50 PM, Jerry Gaffke via Groups.Io wrote:
And if you really wanted an MMIC for the pre-driver,
here's a cheap one capable of 18dBm.  $0.55 each if you get a reel.
    https://www.mouser.com/ProductDetail/Infineon-Technologies/BGA-616-H6327?qs=sGAEpiMZZMsHFhLSzabyWc6yBY9ZVzZQAmz94oaQAYo%3d


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