Understanding Noise in the Signal Chain

Learn about one of the most important aspects of circuit and systems design: noise and how it affects the performance of the signal chain.

By understanding noise issues in your designs, you can identify Intersil products that can reduce noise and improve performance.

In this on-demand webinar you'll learn 3 things:

  1. What noise is and how it's specified at the component level
  2. How this noise affects the performance of a signal chain
  3. How to select components based on signal chain requirements
Don't have time to watch the webinar?

Download the Slides »

Noise Estimating Calculators

Calculators for Estimating Noise Amplitudes & Selecting the Best Data Converter

Intersil's Thermal Noise Calculator (TNC) and Effective Number of Bits (ENOB) Calculator help analyze noise that is present in semiconductor devices as well as noise due to signal processing in data converters.

Using the calculators, you can enter or find all parameters. The calculators also offer indication of consistent parameters, validation to prevent illegal entries, and import, export and graphing functionality.

System Requirements

  • Windows® 7 or Windows® 8
  • File Size: 30MB

Thermal Noise Calculator

The Thermal Noise Calculator aids in the analysis of thermal noise found in resistors and other noise sources. The TNC finds the noise voltage generated by any device if the white noise spectral density and 1/f corner frequency are known.

Thermal Noise Calculator


  • Noise Voltage, Vn, in μVpp or μVrms
  • White Noise Spectral Density, ND, in nV/√Hz
  • Johnson Resistance, R, in Ω
  • Temperature, T, in °C
  • Upper Frequency, Fh, in Hz
  • Lower Frequency, Fl, in Hz
  • 1/f Corner Frequency, Fc, in Hz

Download Calculator »

Effective Number of Bits Calculator

ENOB is an AC specification and is synonymous with Signal to Noise and Distortion. The ENOB Calculator aids in the design and analysis of data converter application circuits. It calculates the effective number of bits of an ideal data converter.

Effective Number of Bits Calculator


  • Effective Number of Bits, ENOB, in bits
  • Signal to Noise and Distortion, SINAD, in dB
  • Resolution, N, in bits
  • Bandwidth, BW, in % of the Nyquist frequency, or Over Sample Ratio, OSR, as a multiple of the sample frequency
  • Average Differential Nonlinearity, DNL, in LSB
  • Clock Jitter, Tj, in PPMrms of the clock period
  • Analog Referred Noise, Vn, in LSBrms
  • Total Harmonic Distortion, THD, in % or dB

Download Calculator »

Related Resources

Download Webinar

Understanding Noise in the Signal Chain Webinar Understanding Noise in the Signal Chain Webinar

noise-in-the-signal-chain-webinar.pdf (2.35 MB)
Apr 2015

Get Help

Thermal Noise Calculator Help V1.1.0 Thermal Noise Calculator Help V1.1.0

tnc-calc-help.pdf (442 KB)
Mar 2015

Effective Number of Bits Calculator Help V1.1.0 Effective Number of Bits Calculator Help V1.1.0

enob-calc-help.pdf (245 KB)
Mar 2015

Learn More

Explore Intersil's portfolio of data converters featuring analog-to-digital converters (ADC), digital-to-analog converters (DAC), and voltage references.

Learn more about Intersil's data converters »