An Analysis of Triple-Tuned Coupled Circuits

An analysis is given of triple-tuned coupled circuits for high-Q cases in which the couplings between circuits are kept small and the response is symmetrical about a reference frequency. Both synchronously tuned and asynchronously tuned cases are investigated in detail. Universal response curves are derived and contour plots of gain bandwidth product are given. The results for the transitional and triple-peak response cases are compared with double-tuned coupled circuits. The advantages of triple-tuned circuits are shown to be their more uniform response in the pass band and fifty per cent better sideband selectivity.