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Chapter: Electronic Circuits - JFET and MOSFET Amplifiers

Common Drain Amplifier

In this circuit, input is applied between gate and source and output is taken between source and drain.

Common Drain Amplifier

 

In this circuit, input is applied between gate and source and output is taken between source and drain.

 


In this circuit, the source voltage is

Vs = VG+VGS

 

When a signal is applied to the JFET gate via C1 ,VG varies with the signal. As VGS is fairly constant and Vs = VG+VGS, Vs varies with Vi.

 

The following figure shows the low frequency equivalent model for common drain circuit.


 

Input Impedance Zi


 Zi = RG

Output Impedance Zo

It is given by


Voltage gain (Av)

 It is given by


Substitute the value Vo and Vi. Then


Common drain circuit does not provide voltage gain.& there is no phase shift between input and output voltages.

 

Table summarizes the performance of common drain amplifier

 



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Electronic Circuits - JFET and MOSFET Amplifiers : Common Drain Amplifier |


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