DC Parameters: Input Offset Voltage (V - Texas Instruments
Application ReportSLOA059 March 20011DC Parameters: Input Offset Voltage (VIO)Richard PalmerAdvanced Analog ProductsABSTRACTThe Input Offset Voltage , VIO, is a common dc parameter in operational amplifier (op amp)specifications. This report aims to familiarize the engineer by discussing the basics andmodern aspects of VIOby providing a definition and a detailed explanation of causes ofVIOfor BJT, BiFET, and CMOS devices. Discussion centers around measurementtechniques, data sheet specifications, and the effect of VIOon circuit design and the trimmethods to correct Offset Voltage Temperature Drift in the Major Device Types ........................................ ........................ CMOS.
Figure 1 presents an ideal op amp together with a table of ideal parameters. The general assumptions listed in the table simplify design analysis and provide a good, first order approximation that is reasonable when the op amp limits are not being pushed. Most applications, however, utilize the op amp to the fullest extent for one or more ...
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