BJT Cascode Amplifier Calculator
This calculator calculates the bias voltage, current, gain
and frequency response of a Cascode Amplifier. A cascode amplifier is a
two-stage amplifier composed of a transconductance amplifier followed by a
current buffer. It can be designed by combining a common-emitter amplifier with
a common-base amplifier. This type of amplifier has high gain and high band
width, as the Miller capacitance limitations of the common emitter amplifier
are minimized by using a second transistor as common- base current buffer.
For this cascode the gain is set by the ratio of RC/RE2. To increase bandwidth maximize the sum of RE1 and RE2.