Summary: Electronic Devices, Global Edition | 9781292223018 | Thomas L Floyd

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• 6 BJT Amplifiers

• 6.1 Amplifier Operation

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•  What is the lowest value of dc collector current to which a transistor having the characteristic curves in Figure 6–4 can be biased and still retain linear operation with a peak-to-peak base current swing of 20 mA?

  Slightly greater than 1 mA minimum

• Describe the end points on an ac load line.

  One end of the ac load line intersects the horizontal axis at Vce(curoff). The other end intersects the vertical axis at Ic(sat).

• 6.2 Transistor AC models

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• Define all of the r parameters and all of the h parameters.

  The r parameters are e r (ac emitter resistance), c r (ac collector resistance), b r (ac base resistance), alphaac (ac alpha), betaac (ac beta). The h parameters are hi (input impedance), hr (voltage feedback ratio), hf (forward current gain), ho (outut admittance)

•  If the hfe of a transistor is specified as 200, determine βac?

  βac = hfe =200

•  A certain transistor has a dc beta (hFE) of 130. If the dc base current is 10 mA, determine re´. αDC = 0.99.

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• At the dc bias point of a certain transistor circuit, IB = 15 mA and IC = 2 mA. Also, a varia tion in IB of 3 mA about the Q-point produces a variation in IC of 0.35 mA about the Q-point. Determine βdc and βac.

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• 6.3 The Common-Emitter Amplifier

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• Draw the dc equivalent circuit and the ac equivalent circuit for the unloaded amplifier in Figure 6–52.

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• Calculate the quiescent power dissipation in Figure 6–52.

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• Connect a 10 kΩ load resistor to the output in Figure 6–52, andDetermine the following values for the amplifier in Figure 6–52.(a) Rin(base)(b) Rin(tot)(c) Av

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• Determine the following dc values for the amplifier in Figure 6–53. (a) IE (b) VE (c) VB (d) IC (e) VC (f) VCE

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