Question 4.6: The drain-feedback biased amplifier of Fig. 4-9(a) has the c......

Schaum’s Outline of Electronic Devices and Circuits [1089587]

The drain-feedback biased amplifier of Fig. 4-9(a) has the circuit element values of Example 4.5 except that the MOSFET is characterized by the parameter values of Example 4.4. Apply SPICE methods to determine the quiescent values.

4.9

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The netlist code below describes the circuit.

Ex4_6.CIR – Drain-feedback bias
vi 1 0 0V ; Value inconsequential
CC 1 2 100uF; Value inconsequential
RF 2 3 50MEGohm
RL 3 4 3kohm
VDD 4 0 15V
M 3 2 0 0 NMOSG
.MODEL NMOSG NMOS (Vto=4V Kp=0.0008ApVsq
+ Rd=1ohm Rg=1kohm)
.DC VDD 15V 15V 1V
.PRINT DC ID(M) V(2) V(3)
.PROBE
.END

Execute 〈Ex4_6.CIR〉 and poll the output file to find $I_{DQ} = ID(M) = 2.79 \text{mA}, V_{DSQ} = V(3) = V_{GSQ} = V(2) = 6.64 \text{V}$ .

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