5.4. Current-Source Common-Source Amplifier: Common-Source Amplifier with a Source Resistor
The bias circuit of the current-source bias amplifier, shown in Fig. 5.6, has a dual power supply. One advantage of this is that the input is at zero dc volts such that the signal can be connected directly without interfering with the bias. The dc circuit equation for setting up the bias is
Equation 5.14
where 
.
This circuit is more bias stable than the grounded source amplifier, as slight changes in VSG (due to device parameter variations or temperature) ...
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