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Abstract
The transmission characteristics of the unbalanced twin-T by the variation of series arm parameters are given. The unbalancing of the twin-T may be used to obtain very high selectivity. Plots of Q versus forward gain G are given. Stability criteria of the selective amplifier have been investigated by Routh-Hurwitz test, Root locus technique and Nyquist plot. Comparison of series and shunt arm variation is made.