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Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

*10.104 The BJT common-emitter amplifier of Fig. P10.104 includes an emitter-degeneration resistance Re. Figure P10.104 (a) Assuming α 1, neglecting ro, and assuming the current source to be ideal, derive an expression for the small-signal voltage gain A(s) ≡ Vo/Vsig that applies in the midband and the low-frequency band. Hence find the midband gain AM and the lower 3-dB frequency fL. (b) Show that including Re reduces the magnitude of AM by a certain factor. What is this factor? (c) Show that including Re reduces fL by the same factor as in (b) and thus one can use Re to trade off gain for bandwidth. (d) For I = 0.25 mA, RC = 10 kΩ, and CE = 10 µF, find |AM| and fL with Re = 0. Now find the value of Re that lowers fL by a factor of 10. What will the gain become? Sketch on the same diagram a Bode plot for the gain magnitude for both cases.

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*10.104 The BJT common-emitter amplifier of Fig. P10.104 includes an emitter-degeneration resistance Re.

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

D *10.103 For the common-emitter amplifier of Fig. P10.103, neglect ro and assume the current source to be ideal. Figure P10.103 (a) Derive an expression for the midband gain. (b) Convince yourself that the two poles caused by CE and CC do not interact. Find expressions for their frequencies, ωPE and ωPC. (c) Give an expression for the amplifier voltage gain Vo(s)/Vsig(s) in terms of AM, ωPE, and ωPC. (d) For Rsig = RC = RL = 10 kΩ, β = 100, and I = 1 mA, find the value of the midband gain. (e) Select values for CE and CC to place the two pole frequencies a decade apart and to obtain a lower 3-dB frequency of 100 Hz while minimizing the total capacitance. (f) Sketch a Bode plot for the gain magnitude, and estimate the frequency at which the gain becomes unity.

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D *10.103 For the common-emitter amplifier of Fig. P10.103, neglect ro and assume the current source to be ideal.

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

10.102 Consider the circuit of Fig. 10.41(a). For Rsig = 5 kΩ, RB ≡ RB1 || RB2 = 10 kΩ, rπ = 1 kΩ, β0 = 100, and RE = 1.5 kΩ, what is the ratio CE/CC1 that makes their contributions to the determination of fL equal? 141.4

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10.102 Consider the circuit of Fig. 10.41(a). For Rsig = 5 kΩ, RB ≡ RB1 || RB2 = 10 kΩ, rπ = 1 kΩ, β0 = 100, and RE = 1.5 kΩ, what is the ratio CE/CC1 that makes their ...

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

D 10.101 For the amplifier described in Problem 10.100, design the coupling and bypass capacitors for a lower 3-dB frequency of 200 Hz. Design so that the contribution of each of CC1 and CC2 to determining fL is only 10%. CC1 = 0.8 μF ; CC2 = 0.8 μF; CE = 9 μF

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D 10.101 For the amplifier described in Problem 10.100, design the coupling and bypass capacitors for a lower 3-dB frequency of 200 Hz. Design so that the contribution of each of CC1 and CC2 to determining fL is only 10%. CC1 ...

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

10.100 Consider the common-emitter amplifier of Fig. 10.41(a) under the following conditions: Rsig = 5 kΩ, RB1 = 33 kΩ, RB2 = 22 kΩ, RE = 3.9 kΩ, RC = 4.7 kΩ, RL = 5.6 kΩ, VCC = 5 V. The dc emitter current can be shown to be IE 0.3 mA, at which β = 120. Find the input resistance Rin and the midband gain AM. If CC1 = CC2 = 1 µF and CE = 20 µF, find the three short-circuit time constants and an estimate for fL.

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10.100 Consider the common-emitter amplifier of Fig. 10.41(a) under the following conditions: Rsig = 5 kΩ, RB1 = 33 kΩ, RB2 = 22 kΩ, RE = 3.9 kΩ, RC = 4.7 kΩ, RL = 5.6 kΩ, VCC = 5 V. ...

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

D 10.99 Figure P10.99 shows a current-source-biased CE amplifier operating at 100 µA from ±3-V power supplies. It employs RC = 20 kΩ, RB = 200 kΩ, and operates between a 20- kΩ source and a 10- kΩ load. The transistor β = 100. Select CE first, for a minimum value specified to one significant digit and providing up to 80% of fL where fL is to be 100 Hz. Then choose CC1 and CC2, each specified to one significant digit, and each contributing about 10% of fL. What fL results? What total capacitance is needed? Figure P10.99 CE = 5 μF; CC1 = 0.5 μF; CC2 = 0.5 μF; 92.2 Hz; 6 μF

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D 10.99 Figure P10.99 shows a current-source-biased CE amplifier operating at 100 µA from ±3-V power supplies. It employs RC = 20 kΩ, RB = 200 kΩ, and operates between a 20- kΩ source and a 10- kΩ load. The ...

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

D 10.98 Figure P10.98 shows a CS amplifier biased by a constant-current source I. Let Rsig = 0.4 MΩ, RG = 1.5 MΩ, gm = 4 mA/V, RD = 20 kΩ, and RL = 20 kΩ. Find AM. Also, design the coupling and bypass capacitors to locate the three low-frequency poles at 100 Hz, 10 Hz, and 1 Hz. Design so as to minimize the total capacitance, with the capacitors specified only to a single significant digit. What value of fL results? Figure P10.98 –31.6 V/V; CS = 7 μF; CC1 = 90 μF; CC2 = 0.4 μF; 90.9 Hz

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D 10.98 Figure P10.98 shows a CS amplifier biased by a constant-current source I. Let Rsig = 0.4 MΩ, RG = 1.5 MΩ, gm = 4 mA/V, RD = 20 kΩ, and RL = 20 kΩ. Find AM. Also, design ...

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

D 10.97 The amplifier in Fig. P10.97 is biased to operate at gm = 2 mA/V. Neglect ro. Figure P10.97 (a) Determine the value of RD that results in a midband gain of −20 V/V. (b) Determine the value of CS that results in a pole frequency of 100 Hz. (c) What is the frequency of the transmission zero introduced by CS? (d) Give an approximate value for the 3-dB frequency fL. (e) Sketch a Bode plot for the gain of this amplifier. What does the plot tell you about the gain at dc? Does this make sense? Why or why not?

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D 10.97 The amplifier in Fig. P10.97 is biased to operate at gm = 2 mA/V. Neglect ro.

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

10.96 The amplifier in Fig. 10.37(a) is biased to operate at gm = 5 mA/V, and has the following component values: Rsig = 100 kΩ, RG1 = 47 MΩ, RG2 = 10 MΩ, CC1 = 0.01 µF, RS = 2 kΩ, CS = 10 µF, RD = 4.7 kΩ, RL = 10 kΩ, and CC2 = 1 µF. Find AM, fP1, fP2, fZ, fP3, and fL. –15.8 V/V; 1.9 Hz; 87.5 Hz; 8 Hz; 10.8 Hz; 87.5 Hz

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10.96 The amplifier in Fig. 10.37(a) is biased to operate at gm = 5 mA/V, and has the following component values: Rsig = 100 kΩ, RG1 = 47 MΩ, RG2 = 10 MΩ, CC1 = 0.01 µF, RS = 2 ...

Asked: August 5, 2023In: microelectronics by sedra and smith 8th ed

D 10.95 The amplifier in Fig. 10.37(a) is biased to operate at gm = 4 mA/V, and RS = 2 kΩ. Find the value of CS (specified to one significant digit) that places its associated pole at 100 Hz or lower. What are the actual frequencies of the pole and zero realized? 8 μF; 89.5 Hz; 10 Hz

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D 10.95 The amplifier in Fig. 10.37(a) is biased to operate at gm = 4 mA/V, and RS = 2 kΩ. Find the value of CS (specified to one significant digit) that places its associated pole at 100 Hz or ...

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10.102 Consider the circuit of Fig. 10.41(a). For Rsig = 5 kΩ, RB ≡ RB1 || RB2 = 10 kΩ, rπ = 1 kΩ, β0 = 100, and RE = 1.5 kΩ, what is the ratio CE/CC1 that makes their contributions to the determination of fL equal? 141.4

D 10.101 For the amplifier described in Problem 10.100, design the coupling and bypass capacitors for a lower 3-dB frequency of 200 Hz. Design so that the contribution of each of CC1 and CC2 to determining fL is only 10%. CC1 = 0.8 μF ; CC2 = 0.8 μF; CE = 9 μF

D 10.95 The amplifier in Fig. 10.37(a) is biased to operate at gm = 4 mA/V, and RS = 2 kΩ. Find the value of CS (specified to one significant digit) that places its associated pole at 100 Hz or lower. What are the actual frequencies of the pole and zero realized? 8 μF; 89.5 Hz; 10 Hz

A shunt generator delivers 450 A at 230 V and ...

15.8 Find the characteristic equation of the circuit in Fig. ...

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