CHAPTER 4
Non-Linear Circuits
Many linear and non-linear analog systems are constructed with op-amp as a basic building block. Linear circuits use (i) negative feedback to force the op-amp to operate within its linear region and (ii) linear elements with a feedback network. Nonlinear circuits use high-gain amplifiers with positive feedback or sometimes no feedback at all, causing op-amp to operate in saturation made. Nonlinear circuits use feedback networks with nonlinear elements like diodes and analog switches. The nonlinear circuits like comparator, Schmitt trigger, precision rectifiers, peak detectors, sample and hold circuits, log amplifiers and antilog amplifiers are described in this chapter.
4.1 Voltage Comparators
Figure 4.1 shows the ...
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