[AMPS] IMD Question

[watson@epiloglaser.com (George K. Watson)]

>>The only way to measure fundamental power without harmonic contribution is
>>with a tuned receiver or spectrum analyzer.

And the entire system has to be calibrated as just slapping a low pass on
the line and measuring power will introduce losses at the fundamental.

>>If this is being observed with an untuned power meter, it is likely
because
>>MOSFETs and FETs readily generate copius amounts of odd-order harmonic
>>energy, most notably 3rd and 5th harmonics.

Isn't this a bit topology dependant? (Which harmonics are generated)

>>Bipolar RF power transistors are built with and without emitter resistance
>>which introduces negative feedback.

Aren't there MOSFETS with 'built in' source resistors? I had heard this
somewhere.

George
K0IW


--
FAQ on WWW:               http://www.contesting.com/ampsfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm