Quick Start Guide N5511A-K26
5
N5511A-K26 Phase Noise Measurement Interface
N5511A-K26 Phase Noise Measurement Interface
N5511A-K26 Phase Noise Measurement Interface (PNMI) is an accessory product designed to
facilitate performing additive noise measurements on two port devices. Refer to the PNTS User’s
Guide Chapter 7 for theory of residual measurements.
Additive noise is the noise added to a signal when the signal is processed by a two-port device.
Such devices include amplifiers, dividers, filters, mixers, multipliers, phase-locked loop synthesizers
or any other two-port electronic networks.
To measure this noise component, a stimulus signal is split to LO ports of a double-balanced mixer
phase detector, and to the DUT in the RF path of the phase detectors. Phase shifters are used to set
90 degrees offset (quadrature) so that the PM component added is passed and the PM component
of the stimulus is rejected.
shows the diagram for a dual-channel additive noise measurement
Figure 1
Dual-Channel Additive Noise Measurement
