Pulse and Digital Circuits

4.1 INTRODUCTION

Diodes, transistors and field-effect transistors (FETs) can be used as linear circuit elements if the operation is restricted to that limited region in the characteristic in which it can be approximated to a straight-line characteristic (small-signal conditions). However, when the input is increased further (under large-signal conditions), these devices no longer behave as linear circuit elements; and the operation can go into the nonlinear region of the characteristic. When these non-linear circuit elements are used in waveshaping applications, the resultant process is termed non-linear waveshaping. In communication systems, sometimes it becomes necessary to eliminate a portion of the input signal, either at a single level or ...