Consider the common-emitter amplifier in the following figure,
with 
= 100,
VA = 100V, C
= 25fF,
C
= 10fF.
a) Draw the small-signal model of this circuit. Apply Miller’s
theorem to split C to input and
output nodes. Calculate the time constants at the input and output
nodes, 
in and
out.
b) Based on the time constants from part a), calculate the input and output pole frequencies, fin and fout. What is the dominant pole of this amplifier?
Homework Answers
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Consider the common-emitter amplifier in the following figure,
with = 100,
VA = 100V, C= 25fF,...
0.7V, and Va 100V. Find: -For the operational amplifier of Figure 4 assume all transistors have...
0.7V, and Va 100V. Find: -For the operational amplifier of Figure 4 assume all transistors have β-100, Find the de emitter currents and the de collector voltage of all transistors. The de voltage at the inputs is OV and the de output voltage is held at 0V (by negative feedback, not shown). Neglect the de base currents for this part. Find the (differential) voltage gain of the amplifier with R-10 k2. Assume the impedance of the capacitor is very large....
0.7V, and Va 100V. Find: -For the operational amplifier of Figure 4 assume all transistors have β...
0.7V, and Va 100V. Find: -For the operational amplifier of Figure 4 assume all transistors have β-100, Find the de emitter currents and the de collector voltage of all transistors. The de voltage at the inputs is OV and the de output voltage is held at 0V (by negative feedback, not shown). Neglect the de base currents for this part. Find the (differential) voltage gain of the amplifier with R-10 k2. Assume the impedance of the capacitor is very large....
The circuit below is "Differential amplifier" The waveform of the input signal is shown below. The...
The circuit below is "Differential amplifier" The waveform of
the input signal is shown below. The input signal is
(1) An expression of the gain of a closed loop on a circuit
Use to induce. (formerly op-amp)
The analysis method can be used. KVL and KCL can be utilized
properly.)
(2)When
set the resistance value so that the closed loop gain is 2.5 and
the output synchronized with the input signal.
Sketch the force signal (exactly mark the maximum and...
Vsig = 10mV*sin(2Kπ) The circuit above is a common-emitter amplifier. Given the parameters in the circuit,...
Vsig = 10mV*sin(2Kπ)
The circuit above is a common-emitter amplifier. Given the
parameters in the circuit,
1. If Rb1=10KΩ, Calculate Rb2, Ib, Ic, Ie, Re, transconductance
(gm), Current through Rb1 (I_rb1), and Current through Rb2(I_rb2),
Vb, Vc, Ve, Vce. Also, calculate Rc to achieve a voltage gain Av =
- 100 V/
(If Rb1 value does not match up, then choose your resistor
value for Rb1.)
2. If the amplitude of Vsig keeps increasing, at what amplitude
of the input...
1. The feedback is negative. True or False? 2. Find the value of the forward amplifier...
1. The feedback is negative. True or
False?
2. Find the value of the forward amplifier gain
3. If R1=10kΩ, what value should R2 have to have a feedback
factor of 1/2?
4. The closed-loop gain is about …
(Hint: The closed-loop gain is positive)
A) 1.5
B) 2.8
C) 1.9
D) 3.7
5) If the overall forward amplifier has a 150 Hz bandwidth (due
to a single dominant pole), the bandwidth of the closed-loop
circuit would be around …...
100 1.5 0.27 5. 6 Pl. Consider the CB amplifier of Figure 1, for which Vcc-15...
100 1.5 0.27 5. 6 Pl. Consider the CB amplifier of Figure 1, for which Vcc-15 V, Rs-50 Ω, and RL-10 kQ. For the BJT, assume that B150, VBE.on0.7 V, and VcE,sat 0.3 V, and ignore the Early effect. For the other resistances, however, assume the same values as those you used for the Common-Emitter (CE) amplifier lab (disregard the value for RE2, as the resistor does not exist in the CB amplifier of Figure 1). Therefore, copy the same...
Laboratory 2: Transistor circuit characteristics A. Objectives: 1. To study the basic characteris...
Laboratory 2: Transistor circuit characteristics A. Objectives: 1. To study the basic characteristics of a transistor circuit. 2. To study the bias circuit of a transistor circuit. B. Apparatus: 1. DC Power supply 2. Experimental boards and corresponding components 3. Electronic calculator (prepared by students) 4. Digital camera (prepared by students for photo taking of the experimental results) 5. Laptop computer with the software PicoScope 6 and Microsoft Word installed. 6. PicoScope PC Oscilloscope and its accessories. 7. Digital multi-meter....
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os,...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os, is so large it may be neglected. 0) Calculate the open circuit voltage gain Av Yout/ Vis. i) The amplifier has a load of 10 k2. Determine the current gain Va. = 12 V 150k 4k3 Vout Vin 200k GND = 0 V Figure 4b a) State the name...
H(o) s(t) ﹁ | y(t) | lyst) Impulse sample at rate o -B 0 B c) (5 pts) Using your value of B from...
We were unable to transcribe this imageH(o) s(t) ﹁ | y(t) | lyst) Impulse sample at rate o -B 0 B c) (5 pts) Using your value of B from part b, what is minimum value of the sampling rate co, that will allow the filter output y(t) to be perfectly recovered from its impulse sampled version ys(0)? d) (5 pts) What is the purpose of the filter H()? (One sentence answer please.) e) (10 pts) Suppose the sampling rate...
Problem 3: Design Problem On Figure P3a, you have a Common Source (CS) n-channel MOSFET amplifier....
Problem 3: Design Problem On Figure P3a, you have a Common Source (CS) n-channel MOSFET amplifier. Notice the absence of a source resistor Rsig and load resistor R. If we know how the present amplifier (the one on Figure P3a) behaves without Rsig and RL, we can infer its behaviors if Rsig and R were to be added. design the amplifier circuit on Figure P3a, i.e., you have to find appropriate values for RGj You are to RG,, RD, and...
0.7V, and Va 100V. Find: -For the operational amplifier of Figure 4 assume all transistors have β-100, Find the de emitter currents and the de collector voltage of all transistors. The de voltage at the inputs is OV and the de output voltage is held at 0V (by negative feedback, not shown). Neglect the de base currents for this part. Find the (differential) voltage gain of the amplifier with R-10 k2. Assume the impedance of the capacitor is very large....
0.7V, and Va 100V. Find: -For the operational amplifier of Figure 4 assume all transistors have β-100, Find the de emitter currents and the de collector voltage of all transistors. The de voltage at the inputs is OV and the de output voltage is held at 0V (by negative feedback, not shown). Neglect the de base currents for this part. Find the (differential) voltage gain of the amplifier with R-10 k2. Assume the impedance of the capacitor is very large....
The circuit below is "Differential amplifier" The waveform of
the input signal is shown below. The input signal is
(1) An expression of the gain of a closed loop on a circuit
Use to induce. (formerly op-amp)
The analysis method can be used. KVL and KCL can be utilized
properly.)
(2)When
set the resistance value so that the closed loop gain is 2.5 and
the output synchronized with the input signal.
Sketch the force signal (exactly mark the maximum and...
Vsig = 10mV*sin(2Kπ)
The circuit above is a common-emitter amplifier. Given the
parameters in the circuit,
1. If Rb1=10KΩ, Calculate Rb2, Ib, Ic, Ie, Re, transconductance
(gm), Current through Rb1 (I_rb1), and Current through Rb2(I_rb2),
Vb, Vc, Ve, Vce. Also, calculate Rc to achieve a voltage gain Av =
- 100 V/
(If Rb1 value does not match up, then choose your resistor
value for Rb1.)
2. If the amplitude of Vsig keeps increasing, at what amplitude
of the input...
1. The feedback is negative. True or
False?
2. Find the value of the forward amplifier gain
3. If R1=10kΩ, what value should R2 have to have a feedback
factor of 1/2?
4. The closed-loop gain is about …
(Hint: The closed-loop gain is positive)
A) 1.5
B) 2.8
C) 1.9
D) 3.7
5) If the overall forward amplifier has a 150 Hz bandwidth (due
to a single dominant pole), the bandwidth of the closed-loop
circuit would be around …...
100 1.5 0.27 5. 6 Pl. Consider the CB amplifier of Figure 1, for which Vcc-15 V, Rs-50 Ω, and RL-10 kQ. For the BJT, assume that B150, VBE.on0.7 V, and VcE,sat 0.3 V, and ignore the Early effect. For the other resistances, however, assume the same values as those you used for the Common-Emitter (CE) amplifier lab (disregard the value for RE2, as the resistor does not exist in the CB amplifier of Figure 1). Therefore, copy the same...
Laboratory 2: Transistor circuit characteristics A. Objectives: 1. To study the basic characteristics of a transistor circuit. 2. To study the bias circuit of a transistor circuit. B. Apparatus: 1. DC Power supply 2. Experimental boards and corresponding components 3. Electronic calculator (prepared by students) 4. Digital camera (prepared by students for photo taking of the experimental results) 5. Laptop computer with the software PicoScope 6 and Microsoft Word installed. 6. PicoScope PC Oscilloscope and its accessories. 7. Digital multi-meter....
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os, is so large it may be neglected. 0) Calculate the open circuit voltage gain Av Yout/ Vis. i) The amplifier has a load of 10 k2. Determine the current gain Va. = 12 V 150k 4k3 Vout Vin 200k GND = 0 V Figure 4b a) State the name...
We were unable to transcribe this imageH(o) s(t) ﹁ | y(t) | lyst) Impulse sample at rate o -B 0 B c) (5 pts) Using your value of B from part b, what is minimum value of the sampling rate co, that will allow the filter output y(t) to be perfectly recovered from its impulse sampled version ys(0)? d) (5 pts) What is the purpose of the filter H()? (One sentence answer please.) e) (10 pts) Suppose the sampling rate...
Problem 3: Design Problem On Figure P3a, you have a Common Source (CS) n-channel MOSFET amplifier. Notice the absence of a source resistor Rsig and load resistor R. If we know how the present amplifier (the one on Figure P3a) behaves without Rsig and RL, we can infer its behaviors if Rsig and R were to be added. design the amplifier circuit on Figure P3a, i.e., you have to find appropriate values for RGj You are to RG,, RD, and...
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