Transcription of DC Parameters: Input Offset Voltage (V - Texas Instruments
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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 ..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 ..3 Figure Op-Amp of VIOfor the TLV2721 ..4 Figure Differential-Pair Amplifier.
The input stage of most op amps consists of a differential-pair amplifier. A simplified version is shown in Figure 4, where Q1 (+ or noninverting input terminal) and Q2 (– or inverting input terminal) can be BJT, FET or MOS transistors. The input terminals of the op amp are the bases (BJT) or gates (FET, MOS) of these transistors.
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