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Lecture 1 Exercises
1. A MOSFET is a device with three terminals: the gate, the source, and the drain. One can
control the drain current (ID) of a MOSFET by adjusting the voltage difference between the
gate and source (the gate-to-source voltage) and the voltage difference between the drain and
source (the drain-to-source voltage). The relationships between these three parameters are
shown approximately in the figure below:
Triode
region
Saturation
region
Increasing
gate-tosource
voltage
ID
Drain-to-source voltage
Assuming that the gate-to-source voltage is held constant, does the MOSFET behave
as a linear device?
(b) Assuming that the gate-to-source voltage is held constant, can you identify operating
regions where the MOSFET operation is approximately linear?
(a)
2. Either the reference voltage polarity or the reference current direction is provided for the
circuit elements below. Provide the appropriate sign convention for the missing parameters.
I1
Current
Source
1A
I2
+
-
V3
V3
-
+
Voltage
Source
+
-
3V
3. Assign reference voltage and current directions to the circuit elements represented by the
shaded boxes in the circuits below.
5mA
+
-
5V
4. 6.241019 electrons enter node b of the circuit element below every second. What is the
current (in Amperes) and its direction through the element?
a
b