Amplification loci of resistance-capacitance coupled amplifiers

This paper applies the method of circular loci to the determination of the vector amplification of resistance-capacitance coupled amplifiers. It is shown that the locus for both exact and approximate equivalent circuits is the sum of 2 circles, whereas for the approximate circuits at high or low frequency the locus is a single circle. The locus of vector amplification for this type of amplifier may be drawn directly from the circuit constants and the magnitude and phase angle of amplification at any frequency read directly.