50 ohm driver circuit

When you are connected to buffer a tester to outside tool, we should have an booster with enough bandwidth and power disposition ability. This circuit is a very simple for unity gain buffer; it is only two pairs of emitter followers. The base emitter voltages of Q1 and Q2 cancel out, and so do those of Q3 and Q4. The preset is used to zero out any small dc offsets due to mismatching in the transistors.

It has reasonably high input impedance, 50 ohm output impedance, a wide bandwidth and high slew rate.

50 ohm driver circuit

Related links
Voltage buffer circuit
Analog buffer circuit
Transistor driver circuit

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Buffer op-amp by IC LM741
Class A Buffer preamplifier by BC550

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Q3 is NPN – wrong Symbol in circuit diagram!
kind regards


Ludwig is correct about Q3. There’s no indication of transistor types here, but the common 2N3904 & 2N3906 types would be a good starting point as their transition frequencies should be around 250 MHz or more and the circuit is basically a pair of emitter follower circuits for each polarity or phase of input signal.

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