Electronics > Beginners
BJT with open emitter ?
shakalnokturn:
What are the advantages of using the B-C junction this way?
(Oscilloscope frontend amp. Q318, Q319)
How about this example with open collectors and B-E junctions back to back, on the same substrate though (I think)?
(Keithley 616 electrometer.)
james_s:
I've seen that done a few times, my assumption was that it was to get diodes with thermal characteristics that match the transistors in the circuit. I'm sure one of our resident analog experts can correct me or elaborate though.
MasterT:
Generally, B-E junction has higher capacitance. Both C-B & B-E works as protection/ overvoltage, difference in frequency on the line. DC and low end ether option is o'k, but for high speed only C-B.
wraper:
In first case seem to be used simply as high frequency diode. In second case as bidirectional Zener diode.
hsn93:
--- Quote from: wraper on January 23, 2020, 04:09:05 am ---In first case seem to be used simply as high frequency diode. In second case as bidirectional Zener diode.
--- End quote ---
is it same if they shorted C-B / EB instead of keeping it Not connected?
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