[Amps] RF power transistor curve trace question
dansawyer at earthlink.net
Sat Jun 13 20:07:09 PDT 2009
All, this is a continuing question in the quest to understand and modify
an ENI base bipolar power amp. I speculated the power transistors were
SD1728's however I am not so sure. I have one SD1728 from another app.
When placed in the curve tracer it produces a pattern with almost
horizontal trace, based step. I removed the devices from one of the ENI
boards and checked the curves . They were rising with a pattern of
between 0 and about 15 degrees, significantly different pattern. (the
gain was close.)
What determines the 'slope' in an RF power transistor?
What is its significance?
These are marked as ST devices, however they appear to have local
markings. They are definitely in a .55 inch case. Any speculation on the
Does the different slope on the curve tracer identify the devices as
different? What spec affects the slope?
Thanks in advance - Dan
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