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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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What types of noise affect an op-amp?

The following noises occur in the op amp as shown in the figure below:

  • 1/f noise dependent on frequency
  • White noise independent of frequency
Figure 1 Frequency-vs-noise curve of an op-amp
Figure 1 Frequency-vs-noise curve of an op-amp
Figure 2 Comparison of noise between  general-purpose and low-noise op-amps
Figure 2 Comparison of noise between general-purpose and low-noise op-amps

The following compares Toshiba’s TC75S51FU CMOS general-purpose op-amp and TC75S67TU CMOS low-noise op-amp.
The low-noise op-amp has less white noise and exhibits lower corner frequency than the general-purpose op-amp.
General-purpose TC75S51F/FU: White noise ≈ 30 nV/√Hz at f=10 kHz, corner frequency (fc) ≈ 300 Hz
Low-noise TC75S67TU: White noise ≈ 6 nV/√Hz at f=10 kHz, corner frequency (fc) ≈ 100Hz
Both 1/f noise and white noise are generated in the op-amp and defined as Equivalent input Noise Voltage. The equivalent input noise voltage is amplified by a gain and appears at the output. Particular care is required as to low-frequency noise because low frequency noise is frequency dependent.

List of Low-noise op-amps

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