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In particular,VSG = 0.35 V so the gate potential is 0.65 V. Figure 20.10b shows how the reference andoutput currents vary if VDD is swept from 900 mV to 1 V. The reference current islinearly dependent on VDD (as seen in Ex. 20.1). The output current is dependent on boththe reference current and the VDS (A.) of M2. In general, we want a reference current thatisn't dependent on power supply or ground variations (noise). This is an important point.Consider the following example.
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