Common Base Common Collector

121

01:15:13

An experiment.  Common base can amplify voltage if the output impedance is higher than the input impedance.  Common Collector then replicates the voltage at a higher current.

Gain:
  27.1db @ 10Mhz
  7.7db @ 100Mhz

Parasitic capacitance interferes with the common collector stage, if I'm not mistaken.  As evidence, a base resistor for it reduces its output (and thus total gain) even though it increases the gain of the common base stage.

published 7 years ago

hurz

7 years ago

The combi, common emitter to common base makes sense, but this way around, from low to low impedance, hmmmm

eekee

7 years ago

Yeah... it's not as good as a common emitter circuit. I made my "VHF common emitter" circuits to compare with this; they're better.

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