Abstract

A blackbody radiometer is designed to measure the noise equivalent power of 10.6-μm heterodyne-receiver front ends as a function of intermediate frequency from 100 to 6000 MHz. The system includes noise diode injection and IF response normalization, making it particularly useful for characterizing high-speed photodetectors coupled to wideband preamplifiers. Experimental results for some 77-K HgCdTe photodiodes indicate amplifier-limited NEP values <2 × 10−19 W/Hz at 4.0 GHz. The NEP data agree well with those obtained by the standard blackbody heterodyne technique.

© 1982 Optical Society of America

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