Abstract: A network structure for path generation includes an operational amplifier circuit (200) implementation. The circuit (200) implements a finite difference approximation template for computing the weighted sum of its four "neighbors." The circuit implementation (200) includes a series of five output operational amplifiers (202, 204, 206, 208 and 210). Each of the output amplifiers includes a feedback path (212) having a feedback resistance, and is connected to the output terminal of its respective operational amplifier and to the negative input terminal (214) of the corresponding amplifier. The positive input terminal (216) of each of the output operational amplifiers is connected to a ground (218). The circuit implementation (200) further includes a series of input operational amplifiers (220, 222, 224, 226 and 228). The output terminals (230) of each of the input operational amplifiers are connected to respective ones of the input terminals (214) of the output operational amplifiers through input impedances.