All of the noise figure response types are real only. Keep this in mind when selecting graph types. Noise figure and noise power quantities are computed using a 10 × log10 convention when a log mag graph type is selected.
Button Selection Group
• The buttons on the NF RESPONSE menu form a button selection group where selection of any one button de-selects all other buttons.
Noise Figure
Select sets the noise figure measurement to Noise Figure. The noise figure is measured on a cold source basis. The units are set by the graph type.
Noise Temperature
Temperature Kelvin. Read-only display of the IEEE default temperature of 290 K. The noise temperature is calculated from the noise figure. For reference:
• 290 K = 17 ºC (62.6 ºF)
• 0 K = −273.15 °C (−459.67 °F)
Noise Power
Select sets the noise figure measurement to Noise Power trace response. The measurement units are set by the graph type. The units will be in absolute power when a receiver calibration is applied.
All of the noise figure response types are real only. Keep this in mind when selecting graph types. Noise figure and noise power quantities are computed using a 10 × log10 convention when a log mag graph type is selected.
Button Selection Group
• The buttons on the NF RESPONSE menu form a button selection group where selection of any one button de-selects all other buttons.
Noise Figure
Select sets the noise figure measurement to Noise Figure. The noise figure is measured on a cold source basis. The units are set by the graph type.
Available Gain
Displays the available gain (in a static display, as it is based on loaded DUT S-parameters) of the DUT. This describes the gain if the output saw a conjugate match.
Insertion Gain
Displays the insertion gain (in a static display, as it is based on loaded DUT S-parameters) of the DUT. This does not include match effects.
Noise Temperature
Temperature Kelvin. Read-only display of the IEEE default temperature of 290 K. The noise temperature is calculated from the noise figure. For reference:
• 290 K = 17 ºC (62.6 ºF)
• 0 K = −273.15 °C (−459.67 °F)
Noise Power
Select sets the noise figure measurement to Noise Power trace response. The measurement units are set by the graph type. The units will be in absolute power when a receiver calibration is applied.
When the DUT type is selected as 2-port, the response can be allocated to either the b1 or b2 receiver on the VNA (e.g., noise power for VNA b1 fully describes the response).
When the DUT type is selected as 4-port, the response can be allocated to the b1 or b2 receiver path or to the differential or common modes.
Configuration (Only available for 4-port DUT)
Each of the above parameters requires a port/receiver definition (with a 4-port DUT) and these selections are either single-ended (into VNA b1 or b2 receivers), differential, or common-mode. If the DUT type is 2-port, the response variable will be assigned to the current receiver path.
