Floyd Self-test Chapter 9 Topic Outline
- Floyd Self-test in The Common-Source Amplifier
- Floyd Self-test in The Common-Drain Amplifier
- Floyd Self-test in The Common-Gate Amplifier
- Floyd Self-test in The Class D Amplifier
- Floyd Self-test in MOSFET Analog Switching
- Floyd Self-test in MOSFET Digital Switching
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. In a common-source amplifier, the output voltage is
- (a) 180áµ’ out of phase with the input
- (b) in phase with the input
- (c) taken at the source
- d) taken at the drain
- (e) answers (a) and (c)
- (f ) answers (a) and (d)
2. In a certain common-source (CS) amplifier, Vds= 3.2 V rms and Vgs =280 mV rms. The voltage gain is
- (a) 1
- (b) 11.4
- (c) 8.75
- (d) 3.2
3. In a certain CS amplifier, RD= 1.0kΩ,RS= 560Ω, VDD= 10 V, AND gm= 4500 μS If the source resistor is completely bypassed, the voltage gain is
- (a) 450
- (b) 45
- (c) 4.5
- (d) 2.52
4. Ideally, the equivalent circuit of a FET contains
- (a) a current source in series with a resistance
- (b) a resistance between drain and source terminals
- (c) a current source between gate and source terminals
- (d) a current source between drain and source terminals
5. The value of the current source in Question 4 is dependent on the
- (a) transconductance and gate-to-source voltage
- (b) dc supply voltage
- (c) external drain resistance
- (d) answers (b) and (c)
6. A certain common-source amplifier has a voltage gain of 10. If the source bypass capacitor is removed,
- (a) the voltage gain will increase
- (b) the transconductance will increase
- (c) the voltage gain will decrease
- (d) the Q-point will shift
7. A CS amplifier has a load resistance of 10 k Ω and RD = 820Ω. If gm = 5 mS and Vin= 500 mV, the output signal voltage is
- (a) 1.89 V
- (b) 2.05 V
- (c) 25 V
- (d) 0.5 V
8. If the load resistance in Question 7 is removed, the output voltage will
- (a) stay the same
- (b) decrease
- (c) increase
- (d) be zero
9. A certain common-drain (CD) amplifier with RS= 1.0 kΩ has a transconductance of 6000 μS .The voltage gain is
- (a) 1
- (b) 0.86
- c) 0.98
- (d) 6
10. The datasheet for the transistor used in a CD amplifier specifies IGSS = 5 nA at VGS = 10 V. If the resistor from gate to ground, RG, is 50MΩ, the total input resistance is approximately
- (a) 50MΩ
- (b) 200MΩ
- (c) 40MΩ
- (d) 20.5MΩ
11. The common-gate (CG) amplifier differs from both the CS and CD configurations in that it has a
- (a) much higher voltage gain
- (b) much lower voltage gain
- (c) much higher input resistance
- (d) much lower input resistance
12. If you are looking for both good voltage gain and high input resistance, you must use a
- (a) CS amplifier
- (b) CD amplifier
- (c) CG amplifier
13. A cascode amplifier consists of
- (a) a CD and a CS amplifier
- (b) a CS and a CG amplifier
- (c) a CG and a CD amplifier
- (d) two CG amplifiers
14. The class D amplifier is similar to
- (a) class C
- (b) class B
- (c) class A
- (d) none of these
15. The class D amplifier uses
- (a) frequency modulation
- (b) amplitude modulation
- (c) pulse-width modulation
- (d) duty cycle modulation
16. E-MOSFETs are generally used for switching applications because of their
- (a) threshold characteristic
- (b) high input resistance
- (c) linearity
- (d) high gain
17. A sampling circuit must sample a signal at a minimum of
- (a) one time per cycle
- (b) the signal frequency
- (c) twice the signal frequency
- (d) alternate cycles
18. The value of resistance emulated by a switched-capacitor circuit is a function of
- (a) voltage and capacitance
- (b) frequency and capacitance
- (c) gain and transconductance
- (d) frequency and transconductance
19. A basic CMOS circuit uses a combination of
- (a) n-channel MOSFETs
- (b) p-channel MOSFETs
- (c) pnp and npn BJTs
- (d) an n-channel and a p-channel MOSFET
20. CMOS is commonly used in
- (a) digital circuits
- (b) linear circuits
- (c) RF circuits
- (d) power circuits
21. If there is an internal open between the drain and source in a CS amplifier, the drain voltage is equal to
- (a) 0 V
- (b) VDD
- (c) VGS
- (d) VGD
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