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Additional info for Basic Theory and Application of Transistors
31. Circuit for problem 1. 40 Basic concepts, units, and laws of circuit theory Fig. 32. Circuit for problem 2. + 4V- + IV - Fig. 33. Circuit for problem 3. C A o- •AAAr 2Q \Q 6Q' 12X2 4Q B o- -AAAr -AMr D Fig. 34. Circuit for problem 4. A C Fig. 35. Circuit for problem 6. o D Problems 41 5. A 1 MQ resistor and a 2/iF capacitor are connected in series across an ideal current source which delivers a current i = 5e~2t mA. The capacitor is uncharged at t=0. 5s. 6. Find the change in the capacitance measured at AB in fig.
It will be noted that the two sources in fig. 26 are examples of dependent sources, that is, their values depend on currents flowing in the circuit itself. 26 with its terminals AB connected to a voltage source and terminals CD short circuited. The circuit for this situation is shown in fig. 27. Applying Kirchhoff's voltage law to the circuits (1) and (2) we obtain Fig. 26. Alternative circuit model of Fig. 24. Lt and L2 are separate inductances with no mutual inductance between them. A o dt Bo ' ' oD 34 Basic concepts, units, and laws of circuit theory t)l=Ll dix dT +M di2 dT and 0= M ^ dt since v2=0.
Two-port voltage divider circuits. A (a) Fixed (c) Continuously variable (potentiometer) (b) Stepped variable Mesh analysis 47 CD are open circuit. Generally, the output port will be connected to some other circuit which will draw current, and this must be taken into account when calculating the attenuation. 8) 2 The circuits shown in fig. 4 fall into the general category known as twoport networks; these are discussed in chapter 8. 3 Mesh analysis The general objective in circuit analysis is the establishment of a set of equations relating the circuit variables, voltages and currents, in terms of the circuit elements.
Basic Theory and Application of Transistors by Department of the Army