SLOU588 March   2025 TRF1213

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Device Information
  8. 2Hardware
    1. 2.1 Setup
      1. 2.1.1 General Use
      2. 2.1.2 Test Setup Diagrams
        1. 2.1.2.1 Gain and OP1dB Test Setup
        2. 2.1.2.2 S-Parameter Test Setup
        3. 2.1.2.3 Noise Figure Test Setup
        4. 2.1.2.4 Two-Tone OIP3 Test Setup
  9. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layout
      1. 3.2.1 Stack-Up and Material
    3. 3.3 Bill of Materials (BOM)
  10. 4Additional Information
    1.     Trademarks
  11. 5Related Documentation

2.1.2.3 Noise Figure Test Setup

TRF1213EVM Noise Figure Test SetupFigure 2-4 Noise Figure Test Setup

Use the following guidelines for noise figure (NF) measurement:

  1. Figure 2-4 shows the traditional Y-factor method for NF measurement, using a noise diode and a spectrum analyzer (or a noise figure analyzer).
  2. While measuring, take into account any RF cable losses to the EVM. Any external input attenuator added for matching results in proportional NF degradation and must be calibrated out in the measurement.
  3. Onboard losses of the input traces at the device input pin must be factored into the NF measurement.
  4. If the loss after the device output is significant, factoring the output loss into the NF measurement is important. Equation 2 shows the Friis equation for a cascaded noise factor used to calculate the NF of the device from the total measured NF. The noise factor of the device, F 1 , can then be extracted and converted into a logarithmic scale to give the TRF1213 NF. The loss of the EVM traces themselves is shown in Figure 2-3.
Equation 1. Ftotal=F1+F2–1G1

where

  • F t o t a l = the total measured noise factor
  • F 1 = the noise factor of the device
  • G 1 = the gain of the device
  • F 2 = the noise factor of the loss on the output