This paper presents a systematic and unitary analysis of a large class of c
urrent and voltage mode circuits based on a series-shunt-like configuration
. Four possible OA types are considered for the basic amplifier. The amplif
iers have voltage and current input signals and voltage and current outputs
. The analysis method is based on the separation of the circuit signal grap
h in two different paths, one that controls the gain and the other that con
trols the bandwidth.