Triple-Tuned Filter Preamplifier
I’ll show the current favorite Jupiter receiver preamplifier circuit. I’m not sure if I’ll keep it, but its transfer function and gain look fabulous.
Above — The schematic of the input filter with PNP common gate amplifier.
Above — S21 in TG plus SA sweep. High Q tank parts, careful tuning, and proper port + part matching may yield wonderful results. Admittedly, it’s hard to get outcomes this good without some serious test equipment.
Above — Filter-amp breadboard photograph.
