Active realization of nonminimum phase RC transfer functions

A method of realizing transfer functions having poles on the negative real axis and zeros anywhere in the s plane is presented. The circuit uses an inverting amplifier of maximum gain unity and a minimum phase RC network in a dual-input unbalanced configuration. The theory is illustrated by two examples of biquadratic nonminimum phase RC transfer functions, of which one is an all-pass type. The sensitivity of the realizations to active and passive element variations is also discussed.