Schaum's Outline of Electronic Devices and Circuits 2nd. Edition by Jimmie J.Cathey | 9780071398305 | 0071398309 | Holooly

Electronic Devices and Circuits

Schaum's Outline of Electronic Devices and Circuits

351 SOLVED PROBLEMS

Question: 6.4

In the CC amplifier of Fig. 6-7(b), let hic = 1 kΩ, hrc = 1, hfc = -101, hoc = 12 μS, and RL = 2 kΩ. Drawing direct analogies with the CE amplifier of Example 6.2, find expressions for the (a) current-gain ratio Ai , (b) voltage-gain ratio Av, (c) input impedance Zin, and (d) output impedance Zo. ...

Verified Answer:

(a) In parallel with (6.43),

A_{i} = {\frac...

Question: 6.3

In the CB amplifier of Fig. 6-6(b), let hib = 30 Ω, hrb = 4 × 10^-6, hfb = -0.99, hob = 8 × 10^-7 S, and RL = 20 kΩ. (These are typical CB amplifier 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) ...

Verified Answer:

(a) By direct analogy with Fig. 6-5(b) and (6.43) ...

Question: 7.SP.23

The input admittance to a triode modeled by the small-signal equivalent circuit of Fig. 7-9(b) is obviously zero; however, there are interelectrode capacitances that must be considered for high-frequency operation. Add these interelectrode capacitances (grid-cathode capacitance Cgk; plate-grid, ...

Verified Answer:

(a) With the interelectrode capacitances in positi...

Question: 7.SP.18

For a triode with plate characteristics given by Fig. 7-8, find (a) the perveance κ and (b) the amplification factor μ. ...

Verified Answer:

(a) The perveance can be evaluated at any point on...

Question: 7.SP.15

Replace the JFET of Fig. 7-5 with the n-channel MOSFET that has the parameters of Example 4.4 except Vto = -4 V. Let R1 = 200 kΩ, R2 = 600 kΩ, RD = RS = 2 kΩ, RL = 3 kΩ, CC1 = CC2 = CS = 100 μF, and VDD = 15 V. Assume vS = 0.250 sin(2π × 10^4t) V for computation purposes and determine the voltage ...

Verified Answer:

The netlist code below describes the MOSFET amplif...

Question: 7.SP.12

Use the small-signal equivalent circuit to predict the peak values of id and vds in Example 4.3. Compare your results with that of Example 4.3, and comment on any differences. ...

Verified Answer:

The values of

g_m

and

r_{ds...

Question: 7.SP.13

For the JFET drain characteristics of Fig. 4-2(a), take vDS as the dependent variable [so that vDS = f (vGS, iD)] and derive the voltage-source small-signal model. ...

Verified Answer:

For small variations about a Q point, the chain ru...

Question: 10.SP.13

A lossless buck-boost converter with continuous inductor current supplies a 10 Ω load with a regulated output voltage of 15 V. The input voltage is 12 V. Determine the value of (a) duty cycle, (b) input power, and (c) average value of input current. ...

Verified Answer:

(a) Solve (10.9) for D to find

G_{V} = {\fr...

Question: 10.SP.11

Let Rx be the inherent resistance of the inductor L for the boost converter of Fig. 10-4 and derive an expression for the actual voltage gain (G′V = V2/V1) that is valid for continuous inductor current. Treat V2 as constant in value. Assume that iL can be described by straight line segments. ...

Verified Answer:

Figure 10-12(a) represents the circuit of Fig. 10-...

Question: 10.SP.10

A boost converter with continuous inductor current is fed from a 12-V source with a 60 percent duty cycle while supplying a power of 60 W to the connected load. Determine (a) the output voltage, (b) the load resistance, and (c) the load current. ...

Verified Answer:

(a) By (10.7),

G_{V} = {\frac{V_{2}}{V_{1}}...

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