Posted on Feb 10, 2013

The circuit has a frequency response ranging from 100Hz to 3 MHz; gain is about 30 dB. Field-effect transistor Q1 is configured in the common-source self-biased mode. Optional resistor R1 allows you to set the input impedance to any desired value; commonly, it will be 50 0. The signal is then direct coupled to Q2, a common-base circuit that isolates the input and output stages and provides the amplifier`s exceptional stability.

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Last, Q3 functions as an emitter follower, to provide low output impedance at about 50 O.!fyou need higher output impedance, include resistor R8. It will affect impedance according to this formula: RS "" RoUT -50. Otherwise, connect output capacitor C4 directly to the emitter of Q3.

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