# Manual 18492469

*5.28 Augment the model of the npn BJT shown in Fig. 5.20(a) by a current source representing Ig. Assume that r, is very large and thus can be neglected. In terms of this addition, what do the terminal currents iy, i, and i; become? If the base lead is open-circuited while the emitter is connected to ground and the collector is connected to a positive supply, tind the emitter and collector currents. D5.56 Consider the CE amplifier circuit of Fig. 5.26(a) when operated with a dc supply Vc =+5 V. It is required to find the point at which the transistor should be biased; that is, find the value of Vc; so that the output sine-wave signal vu, resulting from an input sine-wave signal v,, of 5-mV peak amplitude has the maximum possible magnitude. What is the peak amplitude of the output sine wave and the value of the gain obtained? Assume linear operation around the bias point. (Hint: To obtain the maximum possible output amplitude for a given input, you need to bias the. transistor as close to the edge of saturation as possible without enter- ing saturation at any time, that is, without vc; decreasing below 0.3 V.) | 5 ‚63 Consider the characteristic curves shown in Fig 5.29 with the following additional calibration data: Label fr the lowest colored line, ig = 1 uA, 10 HA, 20 ДА 30 А nd 40 HA. Assume the lines to be horizontal, and let = 100 Рог Усс = 5 У апа Rc = 1 kQ, what peak-to-peak collector voltage swing will result for ‘в varying over the range 10 uA © 40 uA? If, at a new bias point (not the one shown in the Igure) Ver = 3 Ve, find the value of Ic and I. If at th 5 С в. Па! {11$ cur- rent Var = 0.7 у and if Ry = of Vos. 100 kQ, find the required value

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