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Military Microwaves Supplement
Recent Advances in Radar Technology
Using Calibration to Optimize Performance in Crucial Measurements
This artice is the second half of a detailed discussion of noise factor for modern RF radio receivers. In Part 1 we discussed the general concept of noise figure and how it is used to convey noise-performance requirements by product definers and circuit designers. It is also used to predict the overall sensitivity of receiver systems. We also presented calculations for a cascaded receiver. In this continuation article we focus on the Y-factor measurement as it applies to mixers. We state which measurement is applicable to the cascade equations derived in Part 1. We also explore some variations of the measurement method the could be used to obtain an approximation to the SSB noise figure of a mixer.
This article ties together the fundamenal definition of noise figure, equation-based analysis of cascade blocks involving mixers, and typical lab techniques for measuring noise figure. In this Part 1 we show how the cascaded noise figure equation is modified by the presence of one or mixers and we derive the applicable equations for a number of popular downconversion architectures. We continue this discussion in Part 2 of this series where we describe the Y-factor method of noise-figure measurement. In Part 2 we focus on the case of a mixer as the device under test in order to identify appropriate measurement methods for mixer noise figures that can be validly applied using the cascade equations derived in Part 1.
This paper explains the pulsed RF operation of Microsemi pulsed GaN HEMT RF power transistors using as an example the 1011GN-700ELM 1030 MHz Mode-S Enhanced Message Length (ELM) avionics device. General descriptions are presented detailing both the pulsed gate bias operation and the bias sequencing operation of the “pulser” circuit used on the Microsemi evaluation test fixtures.
The primary goal of the MIMO OTA measurement system is to be able to compare Multi-antenna/MIMO devices and algorithms based on their throughput performances when tested against spatial channel models. All critical parts of the mobile terminal design (antennas, RF front-end, baseband processing) are tested in an end-to-end configuration. This document aims to present all the most relevant technical features of the MVG StarMIMO system relative to the MIMO OTA measurement technique with anechoic chambers.
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