Components that can operate at 200 degrees Celsius

Anyone know of any PLLs, VCOs in the 0.8-2.5 Ghz range, Log Detectors, etc that can stand very high operating temperatures? I am not finding much above 125 deg C.

The components that may operate around 200C will be absolutely "Compound Type" e.g. GaAs, InP etc.In fact 175C is max. permissible junction temperature for these type of components and a special cooling sytem should be developed to decrease junction temperature such as gas or water cooling system.
Silcon and its derivatives don't resist more than typically 85C

Lots and lots of insulation may help if it is not a sustained high temp. I read this article a while back, which mentions how the space shuttle used a commercially available camera (Sony XC-999), although some company assembled it in their own housing. I'm guessing the exterior experienced these temperatures for a while, but not sustained.