Common Source MOSFET AmplifierĬommon source amplifier can be defined as when the i/p signal is given at both the terminals of the gate (G) & source (S), the o/p voltage can be amplified & attained across the resistor at the load within the drain (D) terminal. MOSFET amplifiers are available in three types like common source (CS), common gate (CG), and common drain (CD), where each type along with its configuration is discussed below. In the above equation, sign “-” comes from the fact that the MOSFET amplifier inverts the o/p signal in equivalence with the BJT CE Amplifier. After that simplification, the equation will become Av = – RD/Rs=1/gm The voltage gain (AV) is the ratio of input voltage and output voltage.
Vout = – RD x ID = -gmVGS RD Voltage Gain The o/p voltage (Vout) is simply given through the voltage drop across the drain resistor (RD) So, ID = gm×VGS & the input voltage (Vin) can be factored by VGS like the following. The voltage drop across the RS resistor can be given by RS×ID.Īccording to the transconductance (gm) definition, the ratio of ID (drain current) to VGS (gate-source voltage) once a constant drain-source voltage is applied. The input voltage (Vin) can be given through the gate (G) to source (S) voltage like VGS.
To make it simpler, we need to consider that there is no load is connected with the drain branch in parallel.
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