barcode fonts for ssrs The output impedance is increased by feedback due to the presence of the controlled source hre vce . in Software

Maker Code 39 Full ASCII in Software The output impedance is increased by feedback due to the presence of the controlled source hre vce .

The output impedance is increased by feedback due to the presence of the controlled source hre vce .
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SMALL-SIGNAL MIDFREQUENCY BJT AMPLIFIERS
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Based on the typical values of this example, the characteristics of the CE ampli er can be summarized as follows: 1. 2. 3. 4. 5. 6. Large current gain Large voltage gain Large power gain Ai Av ) Current and voltage phase shifts of 1808 Moderate input impedance Moderate output impedance
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CB AMPLIFIER ANALYSIS
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A simpli ed (bias network omitted) CB ampli er is shown in Fig. 6-6(a), and the associated small-signal equivalent circuit in Fig. 6-6(b).
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ie hib hrb Lcb _ B Zin + hfb ie
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_ Zo (b)
Fig. 6-6
CB ampli er
Example 6.3. In the CB ampli er of Fig. 6-6(b), let hib 30 ; hrb 4 10 6 ; hfb 0:99; hob 8 10 7 S, and RL 20 k. (These are typical CB ampli er values.) Find expressions for the (a) current-gain ratio Ai , (b) voltage-gain ratio Av , (c) input impedance Zin , and (d) output impedance Zo . (e) Evaluate this typical CE ampli er. (a) By direct analogy with Fig. 6-5(b) and (6.43) Ai hfb 0:99 0:974 1 hob RL 1 8 10 7 20 103 6:51
Note that Ai % hfb < 1, and that the input and output currents are in phase because hfb < 0. (b) By direct analogy with Fig. 6-5(b) and (6.46), Av hfb RL 0:99 20 103 647:9 3 30 8 10 7 0:99 4 10 6 hib RL hib hoc hfb hrb 30 20 10 6:52
Observe that Av % hfb RL =hib , and the output and input voltages are in phase because hfb < 0. (c) By direct analogy with Fig. 6-5(b) and (6.47) Zin hib It is apparent that Zin % hib . (d) By analogy with Fig. 6-5(b) and (6.50), Zo 1 1 1:07 M hob hfb hrb =hib 8 10 7 0:99 4 10 6 =30 6:54 hrb hfb RL 4 10 6 0:99 20 103 30 30:08  1 hob RL 1 8 10 7 20 103 6:53
Note that Zo is decreased because of the feedback from the output mesh to the input mesh through hrb vcb .
CHAP. 6]
SMALL-SIGNAL MIDFREQUENCY BJT AMPLIFIERS
Based on the typical values of this example, the characteristics of the CB ampli er can be summarized as follows: 1. 2. 3. 4. 5. 6. Current gain of less than 1 High voltage gain Power gain approximately equal to voltage gain No phase shift for current or voltage Small input impedance Large output impedance
CC AMPLIFIER ANALYSIS The small-signal equivalent
Figure 6-7(a) shows a CC ampli er with the bias network omitted. circuit is drawn in Fig. 6-7(b).
ib + hrc Lec _ C hfc ib
E B +
iL RL + LL _ +
RL L L _
_ Zin
_ Zo (b)
C _ (a)
Fig. 6-7
CC ampli er
Example 6.4. In the CC ampli er of Fig. 6-7(b), let hic 1 k; hrc 1; hfc 101; hoc 12 S, and RL 2 k. Drawing direct analogies with the CE ampli er of Example 6.2, nd expressions for the (a) current-gain ratio Ai , (b) voltage-gain ratio Av , (c) input impedance Zin , and (d) output impedance Zo . (e) Evaluate this typical CC ampli er. (a) In parallel with (6.43), Ai hfc 101 98:6 1 hoc RL 1 12 10 6 2 103 6:55
Note that Ai % hfc , and that the input and output currents are in phase because hfc < 0. (b) In parallel with (6.46), Av hfc RL 101 2 103 0:995 hic RL hic hoc hfc hrc 1 103 2 103 1 103 12 10 6 101 1 6:56
Observe that Av % 1= 1 hic hoc =hfc % 1. Since the gain is approximately 1 and the output voltage is in phase with the input voltage, this ampli er is commonly called a unity follower. (c) In parallel with (6.47), Zin hic Note that Zin % hfc =hoc . (d) In parallel with (6.50), Zo Note that Zo % hic =hfc . 1 1 9:9  hoc hfc hrc =hic 12 10 6 101 1 = 1 103 hrc hfc RL 1 101 2 103 1 103 8:41 M 1 hoc RL 1 12 10 6 2 103 6:57
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