Noise measurements allow the determination of the four Noise Parameters of a device (transistor).  There are four Noise Parameters which fully describe the noise behaviour of an active or passive device at a given frequency. 

The Noise Parameters are not load depended, they are only affected by Source Impedance. There exist a simple relation between the four Noise Parameters:

NF calculation formula is the following:

  • NFLinear = NFMinLinear + ((4 * Rn / Zo) * (Gs – GammaOpt).Mag2 ) / ((1 + GammaOpt).Mag2 * (1 – Gs.Mag2));

This is the equation of a set of isometric circles on the Smith Chart (Noise Circles) for which the value of the Noise Figure is the Level on each circle. This Circle Representation is only possible because the Noise behaviour of transistors is a Small Signal Phenomenon.

Where:

  • NFminLinear is the minimum noise figure in linear.
  • Rn is the equivalent noise resistance in Ohms
  • Gs is the gamma presented to the DUT at the input (in our case by the tuner).
  •  GammaOpt is the optimum gamma (ie: gamma source for which the DUT produces the minimum noise figure).
    • Note: Mag2 denotes the magnitude squared.

Wideband Noise Parameters using Passive Tuners

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  • Hardware
  • Brochure
  • Graphs
  • Setup

Input Noise Module

wdt_ID Model s Frequency Connector Insertion Loss VSWR
1 INM-2600 up to 26.5 GHz 3.5mm 0.80 dB 1.60
2 INM-4000 up to 40 GHz 2.9mm 0.91 dB 1.80
3 INM-5000 up to 50 GHz 2.4mm 0.99 dB 1.80
4 INM-6700 up to 67 GHz 1.85mm 1.12 dB 1.90

Output Noise Module

wdt_ID Model s Frequency Connector Downconverter Minimum Gain (dB) Maximum VSWR
1 ONM-2600 up to 26.5 GHz 3.5mm 29 1.8:1
2 ONM-4000 up to 40 GHz 2.9mm 30 for ≤26.5GHz, 29 for 26-40GHz 2.1:1
3 ONM-4000-DC up to 40 GHz 2.9mm 30 for ≤26.5GHz, 29 for 26-40GHz 2.1:1
4 ONM-5000 up to 50 GHz 2.4mm 27 for ≤26.5GHz, 27 for 26-40GHz, 28 for 40-50GHz 2:1
5 ONM-5000-DC up to 50 GHz 2.4mm 27 for ≤26.5GHz, 27 for 26-40GHz, 28 for 40-50GHz 2:1
6 ONM-6700 up to 67 GHz 1.85mm 29 for ≤26.5GHz, 28.5 for 26-40GHz, 28 for 40-50GHz, 21 for 50-65GHz 3:1
7 ONM-6700-DC up to 67 GHz 1.85mm 29 for ≤26.5GHz, 28.5 for 26-40GHz, 28 for 40-50GHz, 21 for 50-65GHz 3:1

Noise Parameters

Noise Circles & Stability Regions

Noise Parameters: Minimum Noise Figure / Rn / Gamma Opt / Phase of Gamma Opt

Typical Noise Setup

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