Common base amplifier voltage gain

Thread starter Physicist3
Start date Apr 21, 2013
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Amplifier Base Gain Voltage

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The voltage gain of a common base amplifier can be calculated using the equation Av = gmRl, where gm represents the transconductance of the transistor and Rl is the equivalent load resistance. For a bipolar junction transistor (BJT), gm is determined by the formula gm = Ic/vt, with Ic being the collector current and vt the thermal voltage. Understanding these parameters is crucial for accurately determining the amplifier's performance. This information is essential for anyone working with common base amplifier circuits.

Apr 21, 2013

Physicist3

Hi,

I have a common base amplifier circuit but I am not sure of the equation to use to calculate the voltage gain? Could someone help me please

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Apr 21, 2013

carlgrace

Av = gmRl where gm is the transconductance of the transistor and Rl is the equivalent load resistance at the drain/emitter.

If it is a BJT then gm is Ic/vt where Ic is the collector current and vt is the thermal voltage kT/q.

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