Analog Circuits: World Class Designs by Robert Pease

By Robert Pease

Newnes has labored with Robert Pease, a pacesetter within the box of analog layout to choose the superior design-specific fabric that we have got to supply. The Newnes portfolio has consistently been recognize for its useful no nonsense technique and our layout content material is in accordance with that culture. This fabric has been selected according to its timeliness and timelessness. Designers will locate notion among those covers highlighting easy layout recommendations that may be tailored to cutting-edge most well liked know-how in addition to layout fabric particular to what's occurring within the box this day. As an additional bonus the editor of this reference tells you why this is often very important fabric to have to be had perpetually. A library needs to for any layout engineers in those fields.

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There are many definitions of stability in the literature, but we’ll consider BIBO stability. In other words, we’ll consider the stability problem given that we’ll only excite our system with bounded inputs. The system is BIBO stable if bounded inputs generate bounded outputs, a condition that is met if all poles are in the left-half plane (Figure 1-6). w ww. c om Review of Feedback Systems 7 jv Poles in left-half plane for BIBO stability s Figure 1-6: Closed-loop pole locations in the left-half plane for bounded input, bounded output (BIBO) stability.

Com 6 Chapter 1 a(s) 1 f log (v) Figure 1-5: Plot for estimating closed-loop transfer function graphically. The curve a(s) depicts the frequency dependence of the forward-path gain. The line 1/f is the inverse of the feedback gain, shown here for resistive feedback. The thick line indicates our estimate for closed-loop transfer function. For a(s)f Ͼ Ͼ1, the closed-loop gain is approximately 1/f. For a(s)f Ͻ Ͻ1, the closed-loop gain is approximately a(s). a 1 ϩ af ⎛ 1 (1 ϩ af ) Ϫ af ϭ = ⎜⎜ 2 ⎜⎝ 1 ϩ af (1 ϩ af ) da ⎛⎜ 1 ⎞⎟ ⎟ ϭ ⎜ a ⎜⎝ 1 ϩ af ⎟⎟⎠ Aϭ dA da ) dA A ⎞⎟ ⎛ 1 ⎟⎟ ⎜⎜ ⎠⎟ ⎜⎝ 1 ϩ af ⎟⎟⎞ ϭ A ⎛⎜⎜ 1 ⎟⎟ a ⎜ 1 + af ⎝ ⎠ ⎞⎟ ⎟⎟ ⎟⎠ [1-6] This result means that if af Ͼ Ͼ 1, then the fractional change in closed-loop gain (dA/A) is much smaller than the fractional change in forward-path gain (da/a).

0 GHz Frequency Figure 1-36: Frequency response results for photodiode amplifier with Cf :2, 4, 6, 8, 10 pF, with Rf ‫ ؍‬1k and Cp ‫ ؍‬60 pF. VCC IL RL Vin VL ϩ a(s) Ϫ va Vsense Rsense Figure 1-37: MOSFET current source. The voltage Vsense senses MOSFET drain current. , not oscillating). A small-signal model is shown in Figure 1-38. Following are the parameters: ␶h Time constant of op-amp high-frequency pole rout Output resistance of op-amp Cgs MOSFET gate-source capacitance Cgd MOSFET gate-drain capacitance gm MOSFET transconductance RL Load resistance The transfer function of the MOSFET source follower is estimated using the method of open-circuit time constants.

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