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Electronics for Beginners by J. Alegado

By J. Alegado

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98 A I t --+RL Fig. 4 Voltage Gain (Av) -htbRL =-----~~~--- A ........ 10 ) h ib + R L (hibhob - htbhrb) v As RL increases, Ay also increases. If RL tends to zero, Ay also tends to zero. CAy as RL~ 0). The variation of Voltage Gain Ay with RL is shown in Fig. 14. A v t --+ RL Fig. 5 ElectroJlJc Circuit Analysis Power Gain (Ap) Power Gain Av increases as RL increases. But AI decreases as RL increases. Therefore, Power Gain, which is product of both, varies with RL as shown in Fig. 15. c. 15 Variation of Ap with RL The characteristics of Common Base Amplifier with typical values are as given below.

O! 180°. Vos = Voo - 10 . RL (DC values) Electronic Circuit Analysis 24 v Suppose AC input of positive voltage (positive half cycle t 8 . . " ) is applied. Gate is p - type. So reverse bias of G - S junction is reduced. So ID increases, because VDS decreases. Therefore, with respect to AC, initially AC is zero, now the AC signal (output) is negative, therefore, VD decrease. So for positive input AC, the AC output i s negative. Hence it introduces a phase-shift. Low frequency equivalent circuit (e) Capacitance and DC voltages are shorted.

5 For a Common Emitter Configuration, what is the maximum value of RL for which R\ differs by no1 more than 10% of its value at ~2 = 0 ? hfe = 50 hie = 1100n; h re = 250 x 10--4; hoe = 25Jl A/v Solution: Expression for ~ is, hfe·h re h 1 oe +RL If R2 = 0, RI = hIe. 1 x 1100 4 hfeh re -0. 24. -----~----o + V DD Fig. 24 Common drain amplifier circuit + Fig. 25 Equivalent circuit KVl Vin - Vgs = Vo Vo = Rs' . 2 [I + Rs'gml = Rs'gm Vin Rs' gm l+Rs' gm Common Gate Amplifier Small signal equivalent of Fig.

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