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Ông là một nhà tư vấn quản lý quốc tế biết đến và một nhà phân tích công nghệ đang nổi lên. Ông Hunt đã có 33 năm kinh nghiệm quản lý và công nghệ tiên tiến như là một phần của đội ngũ nhân viên chuyên nghiệp của Công ty Nghiên cứu Công nghệ | 76 RESPONSE OF OPERATIONAL A LIFIERS PART II and fA 30 MHz. Hence when c2 0 the overall amplification is 30 000 _ 1 if 200 kHzXl j 30 MHz shown by the graphs marked 6 in Figure 6.11. The magnitude of this amplification drops at a rate of 40 dB decade of frequency above a frequency of 30 MHz as compared to a frequency of 300 MHz in the case of c2 3.6 pF. It will be seen in Chapters 7 and 8 that the c2 3.6 pF case of graph a in Figure 6.11 is preferable even though the amplification in the c2 0 case of graph 6 in Figure 6.11 has a greater magnitude between 20 kHz and 300 MHz this is because the phase with c2 3.6 pF is preferable at frequencies above 3 MHz . 6.4.3 Transient Response of Compound Lag Networks When input voltage V n is a step function with magnitude vo W. 0 7 6.35 and by use of Equation 6.30a K.U.W Y H 6 36 The inverse Laplace transform of Equation 6.36 can be written for times t 0 as Ku. 0 Vo 1 - 6.37 Ti Tt tv 6.5 Series RLC Circuits Inductances are only rarely significant in operational amplifier circuits. The principal reason for discussing the series RLC circuit shown in Figure 6.12 is the use of the results in representing feedback amplifiers in Chapter 8. The discussion starts here in the Laplace transform domain this is followed by descriptions of the frequency response and the transient response. 6.5 SERIES RLC CIRCUITS 77 FIGURE 6.12 A series RLC circuit. The transfer function of the series RLC circuit shown in Figure 6.12 can be written in the Laplace transform domain as _ 6.38 1 RCs LCs2 which can also be written 1 t6 39a VM 1 snXi st2 where 4 1 pP-4m 6.39b ĨJ 2L - - - 1-7 -4 . 6.39c t2 2L v and m - 6-39d 1 c Three cases can be distinguished There are two distinct real roots when m 0.25 there are two equal real roots when m 0.25 and there are two conjugate complex roots when m 0.25. The resulting frequency response is shown in Figure 6.13 for various values of m LỊR2C. It can be shown that there is a peak in the magnitude versus frequency .
