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Amadornes super circuit maker9/28/2023 ![]() To understand the superhet’s superiority over previous designs or architectures, it is helpful to review a few of the difficulties of one receiver design that it replaced - that of the “Tuned Radio Frequency” or TRF receiver, shown in Figure 1. Almost a century after its introduction - except for sophisticated approaches such as software radio that involve advanced digital signal processing techniques - Armstrong’s “superheterodyne” or “superhet” design reigns supreme in communications electronics. Although cell phones, global positioning system receivers, satellite television systems, and the AM/FM radio in your car perform completely different functions, the receivers used in these systems are all based on a concept first developed by the American electrical engineer Edwin Armstrong during the waning days of the first World War.
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