1 Figure 4.29 The use of fixed bias (constant V GS ) can result in a large variability in the value of I D. Devices 1 and 2 represent extremes among units.

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Presentation transcript:

1 Figure 4.29 The use of fixed bias (constant V GS ) can result in a large variability in the value of I D. Devices 1 and 2 represent extremes among units of the same type.

2 Figure 4.30 Biasing using a fixed voltage at the gate, V G, and a resistance in the source lead, R S : (a) basic arrangement; (b) reduced variability in I D ; (c) practical implementation using a single supply.

3 Figure 4.30 Biasing using a fixed voltage at the gate, V G, and a resistance in the source lead, R S : (d) coupling of a signal source to the gate using a capacitor C C1 ; (e) practical implementation using two supplies.

4 Figure 4.31 Circuit for Example 4.9.

5 Figure 4.32 Biasing the MOSFET using a large drain-to-gate feedback resistance, R G.

6 Figure 4.33 (a) Biasing the MOSFET using a constant-current source I. (b) Implementation of the constant-current source I using a current mirror.