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12.12 Consider the complementary-BJT class B output stage and neglect the effects of finite Vgf and...
7, (15 pts) Draw the circuit for the complementary BJT class B output stage. For ±10...
7, (15 pts) Draw the circuit for the complementary BJT class B output stage. For ±10 V power supplies and a 10-Ω load resistance, what is the maximum sine-wave output power available? What supply power corresponds? What is the power-conversion efficiency in this case? (Neglect the effects of VbE and VcEsat.)
2. Consider a class B BJT output stage with a square wave output voltage of amplitude Vo across a...
2. Consider a class B BJT output stage with a square wave output voltage of amplitude Vo across a load Ri. and employing power supplies Vss. Neglecting the effects of finite VBE and VCEs (i.e., assume both VBE and VcEsat are negligible small) determine the load power, the supply power, the power conversion efficiency, the maximum attainable power conversion efficiency and the corresponding value of Vo.
2. Consider a class B BJT output stage with a square wave output voltage...
Page 1. (a) Prove that if the voltage across a resistor Ri is a sine wave with amplitude Vcc, then the average power dissipated during one cycle is given by Vec/2R (b) A Class B BJT output stage...
Page 1. (a) Prove that if the voltage across a resistor Ri is a sine wave with amplitude Vcc, then the average power dissipated during one cycle is given by Vec/2R (b) A Class B BJT output stage is shown in Fig. I. Assume that Vout(t) = Vcc. sin wt; Voe >> VCE(oat); and . Also ignore any crossover distortion effects due to the deddband in the voltage transfer characteristic. Sketch the waveforms for lci(t), Ic2(t) and It(t). (c) Find...
a) What is "power-conversion efficiency' of an output stage? Comparo the class-A and class-B amplifier output...
a) What is "power-conversion efficiency' of an output stage? Comparo the class-A and class-B amplifier output stages with rospect to their power-conversion officiencies. b) Assume that an emitter follower 9, is used as a class-A output stago, with the constant current supplied by another transistor 2. (as in Figure Q.4.a). Let Vcc=16V, 1 =100mA, and R=10002. If the output voltage is an 4-V-peak sinusoid, find the power conversion efficiency. VC Figure Q.4.a c) Explain the crossover distortion in a class-B...
1. A class B output stage operates from 310V supplies. Assuming relatively ideal transistors, what is...
1. A class B output stage operates from 310V supplies. Assuming relatively ideal transistors, what is the output voltage for maximum power-conversion efficiency? What is the output voltage for maximum device dissipation? If each of the output devices is individually rated for 2-W dissipation, and a factor-of-2 safety margin is to be used, what is the smallest value of load resistance that can be tolerated, if operation is always at full output voltage? If operation is allowed at half the...
It is required to design a class B output stage to deliver an average power of 20 W to an 8-Ω loa...
It is required to design a class B output stage to deliver an average power of 20 W to an 8-Ω load. The power supply is to be selected such that Vcc is about 5 V greater than the peak output voltage. This avoids transistor saturation and the associated nonlinear distortion, and allows for including short-circuit protection circuitry. (The latter will be discussed in Section 12.6.) Determine the supply voltage required the peak current drawn from each supply, the total...
2. Design an idealized class B output stage, as shown in Figure 2, to deliver an...
2. Design an idealized class B output stage, as shown in Figure 2, to deliver an average of 25 W to an 82 speaker. The peak output voltage must be no larger than 80 percent of supply voltages Vcc. Determine: a) The required value of Voc b) The peak current in each transistor c) The power conversion efficiency V+ On Vo ap RL Figure 2
1. (a) Prove that if the voltage across a resistor RL is a sine wave with...
1. (a) Prove that if the voltage across a resistor RL is a sine wave with amplitude Vcc, then the average power dissipated during one cycle is given by Vc/2RL (b) A Class B BJT output stage is shown in Fig. 1. Assume that Vout (t)-Vcc sinwt; Voc >> VCE(sat); and ß - oo. Also ignore any crossover distortion effects due to the deadband in the voltage transfer characteristic. Sketch the waveforms for Ici (t), Ic2(t), and IL(t) (c) Find...
The last stage of operational Amplifier is a power amplifier. Class B is a good choice...
The last stage of operational Amplifier is a power amplifier. Class B is a good choice for the power amplifier. However, class B suffer from crossover distortion. Several methods are used to correct this non linearity as was discussed in the lecture (class AB). One of this method is the use of VBE multiplier. Design the output of an operational amplifier using class AB that employ VBE multiplier. For temperature stability RE can be used for the NPN and PNP...
. Consider the class-A output stage shown below, the input signal is a square wave. Assume...
. Consider the class-A output stage shown below, the input signal is a square wave. Assume VCE, sat ~ 0, and Vce>0.7V, and T2 = 27, Τι Vo Ri 0.5Vcc T2 (A) Find the average power efficiency (express as functions of Ri, Vo and D) (B) If RL = 8Ω, and Ve.-12V, find the best l value to maximize power efficiency while not to cut the signal
7, (15 pts) Draw the circuit for the complementary BJT class B output stage. For ±10 V power supplies and a 10-Ω load resistance, what is the maximum sine-wave output power available? What supply power corresponds? What is the power-conversion efficiency in this case? (Neglect the effects of VbE and VcEsat.)
2. Consider a class B BJT output stage with a square wave output voltage of amplitude Vo across a load Ri. and employing power supplies Vss. Neglecting the effects of finite VBE and VCEs (i.e., assume both VBE and VcEsat are negligible small) determine the load power, the supply power, the power conversion efficiency, the maximum attainable power conversion efficiency and the corresponding value of Vo.
2. Consider a class B BJT output stage with a square wave output voltage...
Page 1. (a) Prove that if the voltage across a resistor Ri is a sine wave with amplitude Vcc, then the average power dissipated during one cycle is given by Vec/2R (b) A Class B BJT output stage is shown in Fig. I. Assume that Vout(t) = Vcc. sin wt; Voe >> VCE(oat); and . Also ignore any crossover distortion effects due to the deddband in the voltage transfer characteristic. Sketch the waveforms for lci(t), Ic2(t) and It(t). (c) Find...
a) What is "power-conversion efficiency' of an output stage? Comparo the class-A and class-B amplifier output stages with rospect to their power-conversion officiencies. b) Assume that an emitter follower 9, is used as a class-A output stago, with the constant current supplied by another transistor 2. (as in Figure Q.4.a). Let Vcc=16V, 1 =100mA, and R=10002. If the output voltage is an 4-V-peak sinusoid, find the power conversion efficiency. VC Figure Q.4.a c) Explain the crossover distortion in a class-B...
1. A class B output stage operates from 310V supplies. Assuming relatively ideal transistors, what is the output voltage for maximum power-conversion efficiency? What is the output voltage for maximum device dissipation? If each of the output devices is individually rated for 2-W dissipation, and a factor-of-2 safety margin is to be used, what is the smallest value of load resistance that can be tolerated, if operation is always at full output voltage? If operation is allowed at half the...
It is required to design a class B output stage to deliver an average power of 20 W to an 8-Ω load. The power supply is to be selected such that Vcc is about 5 V greater than the peak output voltage. This avoids transistor saturation and the associated nonlinear distortion, and allows for including short-circuit protection circuitry. (The latter will be discussed in Section 12.6.) Determine the supply voltage required the peak current drawn from each supply, the total...
2. Design an idealized class B output stage, as shown in Figure 2, to deliver an average of 25 W to an 82 speaker. The peak output voltage must be no larger than 80 percent of supply voltages Vcc. Determine: a) The required value of Voc b) The peak current in each transistor c) The power conversion efficiency V+ On Vo ap RL Figure 2
1. (a) Prove that if the voltage across a resistor RL is a sine wave with amplitude Vcc, then the average power dissipated during one cycle is given by Vc/2RL (b) A Class B BJT output stage is shown in Fig. 1. Assume that Vout (t)-Vcc sinwt; Voc >> VCE(sat); and ß - oo. Also ignore any crossover distortion effects due to the deadband in the voltage transfer characteristic. Sketch the waveforms for Ici (t), Ic2(t), and IL(t) (c) Find...
. Consider the class-A output stage shown below, the input signal is a square wave. Assume VCE, sat ~ 0, and Vce>0.7V, and T2 = 27, Τι Vo Ri 0.5Vcc T2 (A) Find the average power efficiency (express as functions of Ri, Vo and D) (B) If RL = 8Ω, and Ve.-12V, find the best l value to maximize power efficiency while not to cut the signal
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