3. Electrical characteristics

Figure 3-1 Op-amp with large internal noise
Figure 3-1 Op-amp with large internal noise

This section describes the electrical characteristics specific to op-amps.

When an op-amp is used as an amplifier, the common-mode input voltage range indicates the input voltage range in which it operates properly. When an op-amp is used to amplify a tiny signal from a sensor or other device, what the sensor resolution is to a sensor is what the input offset voltage or the common-mode input signal rejection ratio (CMRR) is to an op-amp. The minimum resolution is determined by the amount of noise.

This section describes the following:

  1. Input offset voltage, VIO
  2. Common-mode input voltage range (CMVIN), common-mode input signal rejection ratio (CMRR)
  3. Op-amp noise
  4. Noise gain and signal gain
Figure 3-2 Effect of input offset voltage
Figure 3-2 Effect of input offset voltage

Chapter3 Electrical characteristics

3.1. Input offset voltage (VIO)
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3.2. Common-mode input voltage range (CMVIN) and common-mode input signal rejection ratio (CMRR)
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3.3. Internal noise of an op-amp
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3.4. Noise gain and signal gain
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