Noise Measurement Post-Amp for Oscilloscope or Spectrum Analyzer


Design files


In some cases a scope or spectrum analyzer does not have the range required to measure very small noise levels.  This noise measurement post-amp boosts the output noise of the device under test (DUT) to allow for measurement with standard test equipment. The key requirements of this circuit is that it has a low noise floor and sufficient bandwidth for characterization of most devices.

  • Test Circuit to amplify noise above instrument noise floor
  • Wide bandwidth 0.016Hz to 443kHz
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDR333.PDF (62 K)

Detailed schematic diagram for design layout and components

TIDC207.ZIP (34 K)

Detailed schematic diagram for design layout and components

TIDR356.PDF (188 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

High-speed op amps (GBW ≥ 50 MHz)

OPA847Wideband, ultra-low noise, voltage feedback operational amplifier with shutdown

Data sheet: PDF
Precision op amps (Vos<1mV)

OPA2111.1nV/rtHz Noise, Low-Power, Precision Operational Amplifier

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* User guide Noise Measurement Post-Amp Design Guide Dec. 10, 2013

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