Low conversion loss diode ring mixers with frequency selective terminations / by René J. Douville (National Space Telecommunications Laboratory). : Co24-3/7-1216-1971E-PDF

"The conversion loss of diode ring modulators has been the subject of much investigation. In this report, the special case of a diode ring terminated at its output by a narrowband tuned circuit and at its input by a wideband circuit is investigated. It is shown that the conversion loss of such a system can, in theory, be made arbitrarily small. A system operating at an input frequency range of 50 kHz to 300 kHz and an output frequency of 700 kHz is described and shown to exhibit less conversion loss than that of a resistively terminated diode ring mixer. A similar system designed to operate over an input frequency range of 1 MHz to 20 MHz is then described. It is shown that the performance of this system deviated from the theoretical and in fact, even without selective terminations was able to achieve low conversion loss. A system is also described which, although not designed specifically to minimize conversion loss, is shown to exhibit low noise figure"--Abstract, page 1.

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