TAILIEUCHUNG - operational amplifiers 2nd phần 10

Để minh họa quá trình sản xuất phân cấp sẽ làm việc trong thế giới thực, xem xét làm thế nào một công ty như Dell Computer có thể sử dụng nó. Dell máy tính làm cho máy tính để đặt hàng. Khi một đơn hàng được thực hiện, quá trình sản xuất bắt đầu. | 244 OTHER CIRCUITS b Verify that since T2 T1 the result of a above can be approximated as W _ c Aic 1 sRCXl STt tdc c Verify that the fraction on the right in b above equals the right side of Equation with Fw dc 1 and with T2 replaced by RC. d Verify that the result of c above also equals Equation with MNlic s 1 and that Equations and are applicable with r2 replaced by RC. e Show that Equation becomes m 3 and that Equations and lead to Tx tB 3 2tp f Substitute MN ic 1 and the results of e above into the right side of Equation . g Note that the result of f above equals the fraction on the right side in b above. 1135 A Type 9914A wideband hybrid operational amplifier is characterized by 4dc 5000 ị MHz and f2 50 MHz. It is used as a voltage follower with lag-lead compensation that is FN 1 if fv ỉ ifỉfù where fL 37 kHz and fv MHz. a Sketch a piecewise linear approximation of the Bode plot for ỊAFNị. b Show that the resulting transfer function of the voltage follower can be approximated as Ku. t l s 4 3ps W 1 s ns 3 Hint Use the results of Section . c The voltage follower is inserted into the signal path of a feedback system that includes a power amplifier with a transfer function of 1 1 s ps . Use the transfer function given in b above and verify that the overall transfer function is 1 1 s ns 3 that is the time constant of the power amplifier is replaced by three time constants of ns each. 1136 Derive the equation for Voul given in Example for an operational amplifier with an amplification A that can be approximated as A 00. Hint Note that an amplification A 00 implies zero voltage between the positive and negative input terminals of an operational amplifier. CHAPTER 12 Internal Structure This chapter outlines three important circuits used in operational amplifiers input stages current mirrors and output stages. Although present technology permits elaborate circuits only

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