Transcription of DC Parameters: Input Offset Voltage (V - TI.com
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DC Parameters: Input Offset Voltage (V - TI.com
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 ..85 Manufacturer Measurement, Trim, and Specification of Measurement .. Circuit Design and Methods of AC DC Feedback .. Internal Calibration .. External ..22 References ..23 FiguresFigure Op-Amp Model and Model Parameters.
components inside the op amp. These errors are always present from the time the power is turned on (i.e., before, during and after any input signal is applied), and they determine how precisely the output matches the ideal op-amp model. Thus the precision of the op amp is determined by the magnitude of the dc errors.
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