Microelectronics: Circuit Analysis and Design
4th Edition
ISBN: 9780073380643
Author: Donald A. Neamen
Publisher: McGraw-Hill Companies, The
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Chapter 10, Problem 10.71P
To determine
The currents
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Coonsider the common emitter amplifier shown in figure below. Assume a
β of 100, VBE = 0.7V, VT = 25mA and VA = 100V.
Draw an equivalent DC model and determine the rπ, transconductance (gm) and ro.
Draw an equaivalent AC model using the small-signal model
Find an expression for vbe and vo in terms of the input voltage
This problem is AC analysis problem. DC analysis is not needed to answer the question.
A) If we assume that the peak voltage of Vbe must be less than 10 mV to avoid small signal
violations determine the value of Rsig if Vi has a peak amplitude of 1 V and Is = 1mA. Hint:
Don't forget r!! Answer: Rsig =.
B) If you did the DC analysis on this problem and calculated Vc = 50 mV and Vs = -100 mV what
is the maximum amplitude of the output voltage while the circuit stays in active mode.
Answer: Vo,max =,
When you "verify" a mode of operation you will need to calculate all three voltages (Vc,
Ve, VE for BJTS and VG, Vs, Vp for MOSFETS) and show the correct two conditions are
satisfied.
Assume Capacitors acts like open circuits at DC and short circuits for AC.
> Assume the following:
5V
o Beta = 100
O VBE = 0.7
o V: (Thermal) = 26 mV
o Vr (Threshold) = 2V
O VA = -
o For MOSFET saturation mode: assume:
lp = K(VGs-Vr)?
(Assume K = 10 mA/V²).
5kn
C2
01
C1
Rsig
1kn
10k
Vi
IIs
:C3
1mA
-5V
2. This is a small signal problem. Suppose the MOSFETS drawn have lp = 1 mA when VGS = 2.5 V, and
Vth = 0.5 V. Suppose the BJTs drawn have Ic = 1 mA when VBE = 0.7 V.
Av
VDD = 5V VDD VDD
T
T
Rc = 1 kn
Vin
RB2 = 10 kn
RB1 = 10 kn
w/li
w
Rp = 1 kn
R₁
Vout
(a) Derive voltage gain Ay and input impedance Zin assuming R₁ ➡8.
(b) Plot Ay as a function of R, assuming R, is attached between Vout and ground.
(c) Rederive Ay and Zin assuming Roo and after swapping the BJT and MOSFET.
RL
Chapter 10 Solutions
Microelectronics: Circuit Analysis and Design
Ch. 10 - The circuit parameters for the two-transistor...Ch. 10 - Consider the circuit shown in Figure 10.3. The...Ch. 10 - The parameters of the circuit shown in Figure 10.5...Ch. 10 - Consider the Widlar current source in Figure 10.9....Ch. 10 - Consider the circuit in Figure 10.10. Assume the...Ch. 10 - A Widlar current source is shown in Figure 10.9....Ch. 10 - Figure 10.12 shows the N-output current mirror....Ch. 10 - Prob. 10.1TYUCh. 10 - Prob. 10.2TYUCh. 10 - For the Wilson current source in Figure 10.8, the...
Ch. 10 - Prob. 10.4TYUCh. 10 - Prob. 10.8EPCh. 10 - Prob. 10.9EPCh. 10 - Consider the JFET circuit in Figure 10.24. The...Ch. 10 - Consider Design Example 10.8. Assume transistor...Ch. 10 - The bias voltages of the MOSFET current source in...Ch. 10 - Prob. 10.7TYUCh. 10 - All transistors in the MOSFET modified Wilson...Ch. 10 - A simple BJT amplifier with active load is shown...Ch. 10 - Prob. 10.9TYUCh. 10 - Prob. 10.10TYUCh. 10 - Prob. 10.11TYUCh. 10 - Prob. 10.12EPCh. 10 - For the circuit in Figure 10.40(a), the transistor...Ch. 10 - Prob. 10.12TYUCh. 10 - Repeat Example 10.12 for the case where a resistor...Ch. 10 - Prob. 10.14TYUCh. 10 - Prob. 1RQCh. 10 - Explain the significance of the output resistance...Ch. 10 - Prob. 3RQCh. 10 - Prob. 4RQCh. 10 - What is the primary advantage of a BJT cascode...Ch. 10 - Prob. 6RQCh. 10 - Can a piecewise linear model of the transistor be...Ch. 10 - Prob. 8RQCh. 10 - Sketch the basic MOSFET two-transistor current...Ch. 10 - Discuss the effect of mismatched transistors on...Ch. 10 - Prob. 11RQCh. 10 - Sketch a MOSFET cascode current source circuit and...Ch. 10 - Discuss the operation of an active load.Ch. 10 - What is the primary advantage of using an active...Ch. 10 - Prob. 15RQCh. 10 - What is the impedance seen looking into a simple...Ch. 10 - What is the advantage of using a cascode active...Ch. 10 - Prob. 10.1PCh. 10 - The matched transistors Q1 and Q2 in Figure...Ch. 10 - Prob. 10.3PCh. 10 - Reconsider the circuit in Figure 10.2(a). Let...Ch. 10 - Prob. 10.5PCh. 10 - The transistor and circuit parameters for the...Ch. 10 - The bias voltages in the circuit shown in Figure...Ch. 10 - Consider the current source in Figure 10.2(b). The...Ch. 10 - Prob. 10.9PCh. 10 - Prob. 10.10PCh. 10 - Prob. D10.11PCh. 10 - In the circuit in Figure P10.11, the transistor...Ch. 10 - Prob. D10.13PCh. 10 - Consider the circuit shown in Figure P 10.14. The...Ch. 10 - Design a basic two-transistor current...Ch. 10 - The values of for the transistors in Figure P10.16...Ch. 10 - Consider the circuit in Figure P10.17. The...Ch. 10 - All transistors in the N output current mirror in...Ch. 10 - Design a pnp version of the basic three-transistor...Ch. 10 - Prob. D10.20PCh. 10 - Consider the Wilson current source in Figure...Ch. 10 - Consider the circuit in Figure P10.22. The...Ch. 10 - Consider the Wilson current-source circuit shown...Ch. 10 - Consider the Widlar current source shown in Figure...Ch. 10 - Prob. 10.25PCh. 10 - Consider the circuit in Figure P10.26. Neglect...Ch. 10 - (a) For the Widlar current source shown in Figure...Ch. 10 - Consider the Widlar current source in Problem...Ch. 10 - (a) Design the Widlar current source such that...Ch. 10 - Design a Widlar current source to provide a bias...Ch. 10 - Design the Widlar current source shown in Figure...Ch. 10 - The circuit parameters of the Widlar current...Ch. 10 - Consider the Widlar current source in Figure 10.9....Ch. 10 - Consider the circuit in Figure P10.34. The...Ch. 10 - The modified Widlar current-source circuit shown...Ch. 10 - Consider the circuit in Figure P10.36. Neglect...Ch. 10 - Consider the Widlar current-source circuit with...Ch. 10 - Assume that all transistors in the circuit in...Ch. 10 - In the circuit in Figure P10.39, the transistor...Ch. 10 - Consider the circuit in Figure P10.39, with...Ch. 10 - Consider the circuit shown in Figure P10.41....Ch. 10 - For the circuit shown in Figure P 10.42, assume...Ch. 10 - Consider the circuit in Figure P10.43. The...Ch. 10 - Consider the MOSFET current-source circuit in...Ch. 10 - The MOSFET current-source circuit in Figure P10.44...Ch. 10 - Consider the basic two-transistor NMOS current...Ch. 10 - Prob. 10.47PCh. 10 - Consider the circuit shown in Figure P10.48. Let...Ch. 10 - Prob. 10.49PCh. 10 - The circuit parameters for the circuit shown in...Ch. 10 - Prob. 10.51PCh. 10 - Figure P10.52 is a PMOS version of the...Ch. 10 - The circuit shown in Figure P10.52 is biased at...Ch. 10 - The transistor circuit shown in Figure P10.54 is...Ch. 10 - Assume the circuit shown in Figure P10.54 is...Ch. 10 - The circuit in Figure P 10.56 is a PMOS version of...Ch. 10 - The transistors in Figure P10.56 have the same...Ch. 10 - Consider the NMOS cascode current source in Figure...Ch. 10 - Consider the NMOS current source in Figure P10.59....Ch. 10 - Prob. 10.60PCh. 10 - The transistors in the circuit shown in Figure...Ch. 10 - A Wilson current mirror is shown in Figure...Ch. 10 - Repeat Problem 10.62 for the modified Wilson...Ch. 10 - Prob. 10.64PCh. 10 - Prob. 10.65PCh. 10 - Prob. D10.66PCh. 10 - Prob. D10.67PCh. 10 - The parameters of the transistors in the circuit...Ch. 10 - Prob. 10.69PCh. 10 - Consider the circuit shown in Figure P10.70. The...Ch. 10 - Prob. 10.71PCh. 10 - Prob. D10.72PCh. 10 - Prob. 10.73PCh. 10 - Prob. D10.74PCh. 10 - Prob. 10.75PCh. 10 - For the circuit shown in Figure P10.76, the...Ch. 10 - Prob. 10.77PCh. 10 - Prob. 10.78PCh. 10 - The bias voltage of the MOSFET amplifier with...Ch. 10 - Prob. 10.80PCh. 10 - Prob. 10.81PCh. 10 - Prob. 10.82PCh. 10 - A BJT amplifier with active load is shown in...Ch. 10 - Prob. 10.84PCh. 10 - Prob. 10.85PCh. 10 - Prob. 10.86PCh. 10 - The parameters of the transistors in Figure P10.87...Ch. 10 - The parameters of the transistors in Figure P10.88...Ch. 10 - A BJT cascode amplifier with a cascode active load...Ch. 10 - Design a bipolar cascode amplifier with a cascode...Ch. 10 - Design a MOSFET cascode amplifier with a cascode...Ch. 10 - Design a generalized Widlar current source (Figure...Ch. 10 - The current source to be designed has the general...Ch. 10 - Designa PMOS version of the current source circuit...Ch. 10 - Consider Exercise TYU 10.10. Redesign the circuit...
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- In the figure, A characteristics curve is shown for the MOSFET. Determine the following outcome and parameters using the values given in the characteristics: i) Find the Ip for the VGs = 4V, where IGs(ON) = 4.5mA ii) Find the transconductence of MOSFET; where, MOSFET having the bias voltage VGs = 4V, and 6V. %3D A (mA) A5 (mA) 10 10 VGs=+8 V 9. 7 .7 VGs =+7 V 6 5 Vas=+6 V 4 VGs =+5 V 2 VGs =+4 V Vas =+3 V 1 3 4. 5 8 Vas 10 15 20 25 Vos Vas = VT=2 V a coarrow_forwardFor the circuit given below Given Vsat=12V . I) Identify the stages II) Find the output voltagearrow_forward3. In the figure shown below, Vmax is measured as 5.9 V and V min measured as 1.2V. 18] In the figure shown below, is measured as 5.9 V an (a) Determine the value of V.. (b) Determine the value of Vm. (c) Determine the modulation index. (d) Suppose we can change the value of V. What is the maximum value that we could use for Vm without causing overmodulation?arrow_forward
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