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.
SLOA059 DC Parameters: Input Offset Voltage (VIO) 5 Q1 Q2 IREF R R VCC VCC VOUT =AVIO =A(V +-V-) V+ V- Figure 4. Simplified Differential-Pair Amplifier. Q1 and Q2 Are BJT, FET or MOS. When the op amp is open loop, this small differential voltage is multiplied by the large internal
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