spot noise figure; spot noise factor (F or NF)

The ratio of (1) the total output noise power per unit bandwidth (spectral density) at a single output frequency when the noise temperature of all input terminations is at the reference noise temperature, T0, at all frequencies that contribute to the output noise to (2) that part of (1) caused by the noise of the signal‑input termination at the signal-input frequency.

NOTE 1 The abbreviation NF is often used in place of symbol F; however, symbol F is preferred.

NOTE 2 These quantities may be expressed logarithmically in decibels (dB).


JESD77-B, 2/00
JESD99B, 5/07
RS-311-A, 11/81
RS-353, 4/68

User login

Browse Alphabetically

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Standards and Documents Assistance

Contact Julie Carlson, 703-624-9230

Dictionary RSS Feed

Subscribe to the JEDEC Dictionary RSS Feed to receive updates when new dictionary entries are added.