www.plcworldOP AMP BASICSHOp Amp History? 1Op Amp Basics1 Introduction2 Op Amp Topologies3 Op Amp Structures4 Op Amp Specifications5 Precision Op Amps6 High Speed Op Amps2Specialty Amplifiers3Using Op Amps with Data Converters4Sensor Signal Conditioning5Analog Filters6Signal Amplifiers7Hardware and Housekeeping Techniqueswww.plcworldOP AMP APPLICATIONSwww.plcworldOP AMP BASICSCHAPTER 1: OP AMP BASICSJames Bryant, Walt Jung, Walt KesterWithin Chapter 1, discussions are focused on the basic aspects of op amps. After a briefintroductory section, this begins with the fundamental topology differences between thetwo broadest classes of op amps, those using voltage feedback and current feedback.These two amplifier types are distinguished more by the nature of their internal circuittopologies than anything else. The voltage feedback op amp topology is the classicstructure, having been used since the earliest vacuum tube based op amps of the 1940 and1950’s, through the first IC versions of the 1960’s, and in