Design a MOSFET circuit with the configuration shown in Figure P3.30. The transistor parameters are V T P = − 0.6 V , k ′ p = 50 μ A/V 2 , and λ = 0 . The circuit bias is ±3 V, the drain current is to be 0.2 mA, the drain−to−source voltage is to be approximately 3 V, and the voltage across R S is to be approximately equal to V S G . In addition, the current through the bias resistors is to be no more than lo percent of the drain current. (Hint: choose a reasonable value of width−to−length ratio for the transistor.)
Design a MOSFET circuit with the configuration shown in Figure P3.30. The transistor parameters are V T P = − 0.6 V , k ′ p = 50 μ A/V 2 , and λ = 0 . The circuit bias is ±3 V, the drain current is to be 0.2 mA, the drain−to−source voltage is to be approximately 3 V, and the voltage across R S is to be approximately equal to V S G . In addition, the current through the bias resistors is to be no more than lo percent of the drain current. (Hint: choose a reasonable value of width−to−length ratio for the transistor.)
Solution Summary: The author explains the design parameters of the MOSFET circuit.
Design a MOSFET circuit with the configuration shown in Figure P3.30. The transistor parameters are
V
T
P
=
−
0.6
V
,
k
′
p
=
50
μ
A/V
2
, and
λ
=
0
. The circuit bias is ±3 V, the drain current is to be 0.2 mA, the drain−to−source voltage is to be approximately 3 V, and the voltage across
R
S
is to be approximately equal to
V
S
G
. In addition, the current through the bias resistors is to be no more than lo percent of the drain current. (Hint: choose a reasonable value of width−to−length ratio for the transistor.)
Design a full-wave rectifier power supply using a 9.52:1 transformer. Assume that the outlet is120 V rms @ 60 Hz. Further assume that the diode turn-on voltage V D(on) is 0.7 V. Pick the valueof CL such that vo has a maximum ripple of 1 V p-p . Solve for the average value of vo = Vo (notethat this may be greater than 12 V) and iD(ave) = ID.
Light-emitting diodes (LEDs) are diodes made with III-V compound semiconductor materials such as aluminum gallium arsenide (AlGaAs), aluminum indium gallium phosphide (AlInGaP) or indium gallium nitride (InGaN), instead of silicon. The LEDs emit light when the device is operated under forward bias. LEDs of different colors have different turn-on voltages VD(on). For example:
VD(on) :
Red: ~ 1.6 V
Yellow: ~ 1.7 V
Green: ~ 1.8 V
Blue: ~ 2.8 V
White: ~ 3.8 V
(a) Model these five LEDs with a simplified piecewise linear model
(b) A rule of thumb is that it takes about 1 mA of current to “light” an LED while ~ 10 mA is needed for it to appear bright. Use the piecewise linear model for the LEDs, for the over-voltage indicator circuit to the right, find the values of Vin which will cause D1 or D2 to light (i.e. when ID1 or ID2 exceeds 1 mA).
Consider a fixed and updated instrumentation amplifier (where two resistors are lumped into one
resistor), analyze the circuit if a common voltage source (VICM) is connected to two inputs.
A₁
R₂
+
R₁
R₂,
RA
www
www
R₁
R₁
www
A3
X
R₁
R₂
www
www
R₁₂
+
Vo
RA
A2
V2 O-
+
R₂
12
R₁
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