This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. ---406748903-1103133357-1011085221=:2183 Content-Type: TEXT/PLAIN; charset=US-ASCII On Mon, 14 Jan 2002, Roman Black wrote: >"agricultural" fashion : > > Suggestions: > * power driver/cc MUST be very low capacitance > * power driver must be simple > * decoupling and layout like RF power stage; > * short thick tracks > * attention to ground planes > * parts close together (and away from others) > * power decoupling with RC > * NON inductive resistors > Hi Joe and Roman ! Ok, I think I have a solution using a 350MHz bandwith operational amplifier and 1GHz power transistor as a switching constant current source ( gif. attached ) All operational compensations and in+;in- resistors are not shown here. It requires bipolar supply but negative one is small and low current one. I think you know what C1,D1,D2 are doing, the rectangular ( or not ) pulse is applied between IN and GND. All Roman's suggestion will be respected ! 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