BJT Cascode Amplifier Calculator

This calculator computes bias voltage and current levels, as well as gain and frequency response for the Cascode amplifier. 

The cascode amplifier has high gain and high band width.  It overcomes the Miller capacitance limitations of the common emitter amplifier by using a second transistor as common- base current buffer.  As a result it can achieve gain bandwidths orders of magnitude larger than the common emitter amplifiers.  The only cost is that a second transistor is needed, and a higher voltage supply is needed so that the transistors have decent operating margins.  

For the this cascode gain is set by the ratio of RC/RE2.  To increase bandwidth maximize the sum of RE1 and RE2. 

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