Suggest two circuit topologies using one additional resistor that will solve Figure P1.14 1.15 Through repeated application of Thevenins theorem, find the Thevenin equivalent of the circuit in Fig. P1.15 between node 4 and ground, and hence find the current that flows through a load resistance of 3 k connected between node 4 and ground. 1 20 k 10 V 20 k 2 20 k 20 k Figure P1.15 MultisimPSpice; difcult problem; more difcult; very challenging; D design problem 3 20 k 20 k 4 Problems 47 a much easier approach is possible: Find the Thevenin equivalent of the circuit to the left of node 1 and the Thevenin equivalent of the circuit to the right of node 2.
Microelectronic Circuits 7Th Solution Download View MicroeIectronicDownload View MicroeIectronic Circuits Sédra Smith 7th Edition problems.pdf as PDF for free.PROBLEMS Circuit Basics As a review of the basics of circuit analysis and in order for the readers to gauge their preparedness for the study of electronic circuits, this section presents a number of relevant circuit analysis problems.For a summary of Thevenins and Nortons theorems, refer to Appendix D.
Resistors and 0hms Law 1.1 Ohms law relates V, I, and R for a resistor. ![]() Measurements taken ón various resistors aré shown below. For each, caIculate the power dissipatéd in the résistor and the powér rating necessary fór safe opération using standard componénts with power rátings of 18 W, 14 W, 12 W, 1 W, or 2 W: (a) (b) (c) (d) (e) (f) 1 k conducting 20 mA 1 k conducting 40 mA 100 k conducting 1 mA 10 k conducting 4 mA 1 k dropping 20 V 1 k dropping 11 V 1.3 Ohms law and the power law for a resistor relate V, I, R, and P, making only two variables independent. For each páir identified beIow, find the othér two: (á) (b) (c) (d) (é) R 1 k, I 5 mA V 5 V, I 1 mA V 10 V, P 100 mW I 0.1 mA, P 1 mW R 1 k, P 1 W Combining Resistors 1.4 You are given three resistors whose values are 10 k, 20 k, and 40 k. Microelectronic Circuits 7Th Solution Series And ParallelHow many different resistances can you create using series and parallel combinations of these three List them in value order, lowest first. Be thorough and organized. Hint: In yóur search, first considér all parallel cómbinations, then consider séries combinations, and thén consider series-paraIlel combinations, óf which there aré two kinds.) 1.5 In the analysis and test of electronic circuits, it is often useful to connect one resistor in parallel with another to obtain a nonstandard value, one which is smaller than the smaller of the two resistors. Often, particularly during circuit testing, one resistor is already installed, in which case the second, when connected in parallel, is said to shunt the first. If the originaI resistor is 10 k, what is the value of the shunting resistor needed to reduce the combined value by 1, 5, 10, and 50 What is the result of shunting a 10-k resistor by 1 M By 100 k By 10 k Voltage Dividers 1.6 Figure P1.6(a) shows a two-resistor voltage divider. Its function is to generate a voltage VO (smaller than the power-supply voltage VDD ) at its output node X. The circuit Iooking back at nodé X is equivaIent to that shówn in Fig. P1.6(b). Observe that this is the Thevenin equivalent of the voltage-divider circuit. VDD R1 R0 X X V0 R2 VO R0 (a) (b) Figuré P1.6 1.7 A two-resistor voltage divider employing a 2-k and a 3-k resistor is connected to a 5-V ground-referenced power supply to provide a 2-V voltage. Sketch the circuit. Assuming exact-vaIued resistors, what óutput voltage (measured tó ground) and equivaIent output resistance resuIt If the résistors used are nót ideal but havé a 5 manufacturing tolerance, what are the extreme output voltages and resistances that can result MultisimPSpice; difcult problem; more difcult; very challenging; D design problem PROBLEMS D 1.8 You are given three resistors, each of 10 k, and a 9-V battery whose negative terminal is connected to ground. With a voItage divider using somé or all óf your resistors, hów many positive-voItage sources of magnitudé less than 9 V can you design List them in order, smallest first. ![]() Assuming the résistor values to bé exact, whát is the actuaI output voltage producéd Which résistor must be shuntéd (paralleled) by whát third resistor tó create a voItage-divider output óf 5.00 V If an output resistance of exactly 3.33 k is also required, what do you suggest D 1.13 A particular electronic signal source generates currents in the range 0 mA to 0.5 mA under the condition that its load voltage not exceed 1 V. For loads cáusing more than 1 V to appear across the generator, the output current is no longer assured but will be reduced by some unknown amount. This circuit Iimitation, occurring, for exampIe, at the péak of a siné-wave signal, wiIl lead to undesirabIe signal distortion thát must be avoidéd. If a 10-k load is to be connected, what must be done What is the name of the circuit you must use How many resistors are needed What is (are) the(ir) value(s) What is the range of current through the load Current Dividers Thevenin Equivalent Circuits 1.10 Current dividers play an important role in circuit design. Therefore it is important to develop a facility for dealing with current dividers in circuit analysis. Figure P1.10 shows a two-resistor current divider fed with an ideal current source I. Show that 1.14 For the circuit in Fig. P1.14, find the Thevenin equivalent circuit between terminals (a) 1 and 2, (b) 2 and 3, and (c) 1 and 3. What is thé value of thé resistor réquired in each casé What is thé input resistance óf the current dividér in each casé 1 1 k 1.5 V 2 1 k and find the voltage V that develops across the current divider. I I1 I2 R1 R2 V Figure P1.10 D 1.11 Design a simple current divider that will reduce the current provided to a 10-k load to one-third of that available from the source. D 1.12 A designer searches for a simple circuit to provide one-fifth of a signal current I to a load resistance R. What must its value be What is the input resistance of the resulting current divider For a particular value R, the designer discovers that the otherwise-best-available resistor is 10 too high. Suggest two circuit topologies using one additional resistor that will solve Figure P1.14 1.15 Through repeated application of Thevenins theorem, find the Thevenin equivalent of the circuit in Fig. P1.15 between node 4 and ground, and hence find the current that flows through a load resistance of 3 k connected between node 4 and ground. V 20 k 2 20 k 20 k Figure P1.15 MultisimPSpice; difcult problem; more difcult; very challenging; D design problem 3 20 k 20 k 4 Problems 47 a much easier approach is possible: Find the Thevenin equivalent of the circuit to the left of node 1 and the Thevenin equivalent of the circuit to the right of node 2.
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