Question 4.13: Determine the drain current, ID , and the source voltage, VS...

Determine the drain current, I_{D} , and the source voltage, V_{S} , of Q_{1} for the CD amplifier with current-source bias shown in Figure 4–48 (a). Assume the FETs are matched and each has a transconductance curve as shown in Figure 4–48 (b).

4.48
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On the transconductance curve draw a line representing the 1.0 kΩ bias resistor for the current source (Q_{2}) . This is shown in Figure 4–49 . The crossing point indicates that I_{D} is approximately 1.8 mA at V_{GS} of -1.8 V. This current in R_{S1} causes the source of Q_{1} to be at + 1.8 V.

4.49

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