Transcription of MT-037: Op Amp Input Offset Voltage - Analog Devices
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MT-037: Op Amp Input Offset Voltage - Analog Devices
MT-037 TUTORIAL Op Amp Input Offset Voltage DEFINITION OF Input Offset Voltage Ideally, if both inputs of an op amp are at exactly the same Voltage , then the output should be at zero volts. In practice, a small differential Voltage must be applied to the inputs to force the output to zero. This is known as the Input Offset Voltage , VOS. Input Offset Voltage is modeled as a Voltage source, VOS, in series with the inverting Input terminal of the op amp as shown in Figure 1. , 10/08, WK Page 1 of 10 zzzzzzzOffset Voltage : The differential Voltage which must be applied to the Input of an op amp to produce zero : chopper stabilized Op Amps:<1 VGeneral Purpose Precision Op Amps:50-500 VBest Bipolar Op Amps:10-25 VBest JFET Input Op Amps:100-1,000 VHigh Speed Op Amps:100-2,000 VUntrimmed CMOS Op Amps:5,000-50,000 VDigiTrim CMOS Op Amps:<100 V-1,000 V-+VOS Figure 1: Typical Op Amp Input Offset Voltage chopper stabilized (also called auto-zero) op amps have a VOS which is less than 1 V ( AD8538, AD8551, AD8571, AD8628, AD8630), and the best precision bipolar op amps (super-beta)
Chopper stabilized (also called auto-zero) op amps have a VOS which is less than 1 µV (e.g. AD8538, AD8551, AD8571, AD8628, AD8630), and the best precision bipolar op amps (super-beta or bias stabilized) can have maximum offsets as low as 25 µV (OP177F). The very best
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