1. (a) Why is the input impedance to a JFET so high? (b) Define Threshold Voltage of a MOSFET (c) For a depletion-type MOSFET, the polarity of the gate voltage can be: positive; negative; positive or negative... which is true and why? (d) What makes the input impedance to a MOSFET so high? (e) What is the difference between Bipolar-Junction-Transistor (BJT) and Field-Effect-Transistors (FETS)?

1. (a) Why is the input impedance to a JFET so high? (b) Define Threshold Voltage of a MOSFET (c) For a depletion-type MOSFET, the polarity of the gate voltage can be: positive; negative; positive or negative... which is true and why? (d) What makes the input impedance to a MOSFET so high? (e) What is the difference between Bipolar-Junction-Transistor (BJT) and Field-Effect-Transistors (FETS)?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Illustrate operational regions of MOSFET using its voltage-current characteristics.
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Multiple-choice questions: 1. When BJTs are used in digital circuits they usually operate in the: a. active region b. breakdown region c. saturation and cutoff regions d. linear region 2. Often a common-collector will be the last stage before the load; the main function(s) of this stage is to: a. provide voltage gain b. provide phase inversion (Inverting) c. provide a high-frequency path to improve the frequency response d. buffer the voltage amplifiers from the low-resistance load and provide impedance matching for maximum power transfer 3. A decrease in base current of a C.E. amplifier causes the voltage measured between the emitter and the collector to increase. a. True b. False
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(iii), Why is the voltage-divider bias the preferred bias configuration? (iv) In a certain voltage-biased npn transistor, VB is 2.95 V. The DC emitter voltage is (a) 0.7 V (b) 2.95 V (c) 2.25 V (v) The emitter current is always (a) greater than the base current (b) less than the collector current (c) greater than the collector current (d) 3.65 V (d) answers (a) and (c)
Bipolar junction transistors (BJTS) are considered “normally-off" devices, because their natural state with no signal applied to the base is no . .between emitter and collector, like an open switch. *
"Bias voltage applied to the emitter electrode of a transistor offers greater stability over bias toward its base." Why? How does that actually work? My professor wants a detailed, engineering level explanation for this, and I am struggling to understand this to the degree he is asking. He says having both a positive and negative voltage source at the emitter bias is not necessary, and won't accept this as part of the explanation. Thanks!
c) Figure 2.3 shows the circuit diagram of a typical npn BJT common emitter amplifier. The values of RB1-30 kOhm, RB2=10.XY kOhm, Rc-3.XY kOhm, Ic=2.XY mA and Vcc=24 V. If the transistor current gain 3 = 50 determine using the full analysis and assuming VBE = 0.7 V the value of RE, hence identify the location of the Q-point (Ic, VCE, IB and VBE). Now sketch the AC circuit model of this amplifier and determine the value of the ac open circuit voltage gain Av and the ac short circuit current gain Ai. (Assume that Vth = 26 mV). Vin RB1 Cin lin RB2 -10 Rc VB RE + Vcc Vc Cout VE www li Figure 2.3 Vout Ce ¡out x=1 y=7
In single transistor amplifier design, it is observed that the voltage gain will always decrease as the load resistance increases. True False The saturation region of MOSFET indicates that the drain current no longer depends on the source-drain voltage while the saturation region of BJT indicates that the collector current no longer depends on the collector-emitter voltage. True False A bipolar junction transistor can be connected to behave like a diode while a field effect transistor can not be connected to behave like a diode. True False A voltage follower circuit is usually designed to have the power gain slightly less than 1 with any passive load. True False A clipper circuit regulates DC voltage input while a clamp circuit regulates AC voltage input. True False