11.101 An op amp has a dc gain of 120 dB and three poles: ωP1 = 105 rad/s, ωP2 = 107 rad/s, and ωP3 = 108 rad/s. The frequency response must be compensated so that the gain has a uniform ...
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11.100 Contemplate the effects of pole splitting by considering Eqs. (11.54), (11.58), and (11.59) under the conditions that R1 R2 = R, C2 C1/10 = C, Cf ≫ C, and gm = 100/R, by calculating ωP1, ωP2, and ωP1, ωP2. ...
D11.99 An op amp with an open-loop voltage gain of 80 dB and poles at 105 Hz, 106 Hz, and 2 × 106 Hz is to be compensated to be stable for unity β. Assume that the op amp incorporates ...
11.98 For the amplifier whose A(s) is depicted in Fig. 11.39, to what value must the first pole frequency be lowered to obtain stable performance for (a) β = 0.001 and (b) β = 0.1? 10 kHz; 100 Hz
D 11.97 For the amplifier described in Problem 11.96, rather than introducing a new dominant pole we can use additional capacitance at the circuit node at which the pole is formed to reduce the frequency of the first pole. If ...
D 11.96 A multipole amplifier having a first pole at 2 MHz and a dc open-loop gain of 80 dB is to be compensated for closed-loop gains as low as unity by the introduction of a new dominant pole. At ...
11.95 A two-pole amplifier for which A0 = 103 and having poles at 1 MHz and 10 MHz is to be connected as a differentiator. On the basis of the rate-of-closure rule, what is the smallest differentiator time constant for ...
11.94 An amplifier has a dc gain of 104 and poles at 105 Hz, 3.16 × 105 Hz, and 106 Hz. Find the value of β, and the corresponding closed-loop gain, for which a phase margin of 45° is obtained.
11.91 Reconsider Exercise 11.21 for the case of a manufacturing error introducing a second pole at 103 Hz. What is now the frequency for which |Aβ| = 1? What is the corresponding phase margin? For what values of β is ...
11.93 For the amplifier described by Fig. 11.38 and with frequency-independent feedback, what is the minimum closed-loop voltage gain that can be obtained for phase margins of 90° and 60°? 87.6 dB; 81.8 dB