Active filter design using exponentially tapered RC lines

This correspondence describes a practical active lowpass network consisting of a cascade of a uniform and an exponential line, and a single voltage-controlled voltage source of finite-source resistance. The network is simulated on a digital computer and optimized with respect to pertinent network parameters. The sensitivity of the optimized network is studied with respect to the gain of the controlled source. It is shown that this sensitivity may be reduced by increasing the taper factor of the exponential line, and that the band-elimination action of the finite-source resistance may be overcome by the uniform line.