Noise Figure

This section is for performing most functions regarding Noise Figure. Noise Figure is a figure of merit of Signal to Noise and the performance of devices and their effect on this signal to Noise ratio or the total noise power.

 

Noise Conv

This screen is used for converting Noise and Noise Power Units and Noise Measure. For the left side enter the Device Noise Figure in dBF and the Device Gain in dB and press the “Calculate” button to figure the Noise Measure. For the right side enter any one Noise value in Noise Figure in dB, Noise Temperature in Kelvin or Noise Factor. Press the “Calculate” button to figure the remaining two conversions. I have defaulted the Ambient Temperature to 290K or 27C for ease. This temperature is used to figure the temperature of the noise source. Press “Clear” to clear and start over and “Close” to quit the screen.

Figure 70 – Noise Figure Conversions and Noise Measure

 

Noise Source

This screen is used figuring the Noise Power of a source. For the left side enter the Temperature in Kelvin, the Bandwidth in Hz, the Impedance in Ohms, Device Noise Figure in dBF and the Device Gain in dB and press the “Calculate” button to figure the Noise Power in dBm and Watts and also in Vrms. I have defaulted the Ambient Temperature to 290K or 27C and the Bandwidth to 1Hz and the Impedance to 50 Ohms for ease, but the user can change if desired. Press “Clear” to clear and start over and “Close” to quit the screen.

 

Figure 71 – Noise Figure Noise Source

 

SPA - DANL/NF

This function set calculates the Noise Figure in dBF, the DANL/ANL Displayed Average Noise level or Average Noise Level and the Tangential Sensitivity. Enter the Temperature in Kelvin, the bandwidth in Hertz and one of the three DANL, Noise Figure or Tangential Sensitivity. It will compute the missing factor. If the DANL/ANL check box is checked it computes to/from DANL and unchecked it computes to/from ANL. In the case below I entered the temperature, bandwidth and checked the DANL box and entered the DANL of –88dBm/Hz. It calculated the Noise figure and Tangential Sensitivity of the receiver. Press “Calculate” to run and “Clear” to clear and start over and “Close” to quit screen.

 

Figure 72 – Noise Figure DANL/ANL to NF and TSS

 

Input Noise Power

This screen is used figuring the Input Noise Power to a Noise Figure Meter or other receiver like a Spectrum Analyzer for instance. Enter the Temperature in Kelvin, the Bandwidth in Hz, the ENR Excess noise Ratio in dB, PreAmp Gain in dB, Device Noise Figure in dBF and the Device Gain in dB and press the “Calculate” button to figure the Total Noise Power in dBm/Hz. I have defaulted the Ambient Temperature to 290K or 27C and the Bandwidth to 1Hz for ease, but the user can change if desired. Press “Clear” to clear and start over and “Close” to quit the screen.

 

Figure 73 – Noise Figure input Noise Power

 

Y Factor

This screen is used for figuring the Noise Figure and Gain of a device using the Y-Factor method. Measure the Noise On and Noise Off power ratio to figure the Noise Figure Using a Spectrum Analyzer, Power Meter or other receiver. Enter the Temperature in Kelvin, the Bandwidth in Hz, Excess Noise Ratio (ENR) of the Noise Source in dB, Input Loss in dB, Noise Power On and Off in dBm and press the “Calculate” button to figure the Noise Figure Power in dBF and Gain in dB. I have defaulted the Ambient Temperature to 290K or 27C and the Bandwidth to 1Hz for ease, but the user can change if desired. Press “Clear” to clear and start over and “Close” to quit the screen.

 

Figure 74 – Noise Figure Y Factor

 

De/Embed Noise

This screen is used for figuring the Cascaded or Embedded or DeEmbeded Noise Figure of a system. Enter the Input Loss before DUT in dB, the First Stage Gain and Noise Figure and the Second Stage Noise Figure and press the “Calculate” button to figure the F21 Noise Figure in dBF. In addition you can work the equation backwards to figure what F1 would be needed to get a specific F21 and F2 for the system. I have defaulted the Ambient Temperature to 290K or 27C for ease, but the user can change if desired. Press “Clear” to clear and start over and “Close” to quit the screen.

Figure 75 – Noise Figure DeEmbedded/Embedded Noise

 

 

ENR Offset

This screen is used for figuring the Excess Noise Ratio (ENR) correction for non-standard ambient temperature and input loss. Enter the Temperature in Kelvin, ENR Excess Noise Ratio of the Noise Source in dB, Input Loss in dB and press the “Calculate” button to figure the Corrected ENR in dB. I have defaulted the Ambient Temperature to 290K or 27C for ease, but the user can change if desired. Press “Clear” to clear and start over and “Close” to quit the screen.

 

Figure 76 – Noise Figure ENR Offset for Loss and Temperature

Noise Error

 

Gain Uncertainty

Enter the System Total Noise Figure (Device 1 and 2), DUT Gain, DUT Gain Uncertainty and the Noise Figure Meter Noise Figure. Press “Calculate” to perform the calculation and get the Upper and Lower Limit of the DUT (Device 1) Noise Figure measurement. Press “Clear” to clear all variables and redo and “Close” to quit the screen.

 

Figure 97 – Noise Figure Error Gain Uncertainty

 

ENR Error

Enter the Noise Source ENR, the Input Loss, the temperature of the lossy component and the uncertainty of reading that temperature. Press “Calculate” to perform the calculation and get the Upper and Lower Limit of the Excess Noise Ratio ENR. Press “Clear” to clear all variables and redo and “Close” to quit the screen.

 

Figure 98 – Noise Figure Error ENR Error

 

System Noise Error

Enter the Noise Source S11 or Input Return Loss, the DUT Noise Figure, DUT Gain, DUT S11 Input and S22 Output Return Losses. I have some initial estimates of the Known Uncertainties defaulted for the operators help. These particular values are the ones I found for the Agilent instruments. Press “Calculate” to perform the calculation and get the Calculated Uncertainties: System Total Noise Figure NF12, Noise Figure Meter NF2, DUT Gain and finally DUT Noise Figure. Press “Clear” to clear all variables and redo and “Close” to quit the screen.

 

Figure 99 Noise Figure Error System Noise Error

 

Available Gain/Loss

Need to finish, test, check and document in this section.