Abstract
Publisher Summary This chapter discusses infrared (IF) heterodyne detection with gigahertz IF response. Analyses on heterodyne mixing are extended to obtain engineering equations useful in optimum infrared receiver design. Substantially increased receiver sensitivities are obtainable using heterodyne detection compared to envelope detection in such applications as infrared communications and radar. Moreover, heterodyne detection preserves phase and frequency, which are of importance in some applications. Heterodyne detection becomes increasingly attractive at longer infrared wavelengths, because the receiver sensitivity limit is set by quantum noise, which is directly proportional to frequency. These considerations also apply to other coherent receivers, such as laser amplifier. Expressions for noise equivalent power (NEP) and mixer conversion gain (G) are given in terms of such parameters as IF amplifier noise factor, mixer resistance, bias voltage, and mixer material properties.
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