8.1. DC (Bias) Circuit
The equation for the dc circuit (Fig. 8.1) is the same as for the current-source common-source stage except that the bias resistor has current 2ID as the current from both transistors is flowing through this resistor. For now, the stage will be assumed to be perfectly balanced such that ID1 = ID2 = ID. The bias equation is
Equation 8.1
Figure 8.1. Dc circuit for differential-amplifier stage with resistance bias. Source and body are normally at different potentials. In the project with this circuit, we attach the two sources to the transistor body, which is allowed in a simple circuit.
Note that the threshold voltage ...
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