On-chip square wave voltammetric pulse generator for redox measurement employing array structure

A square wave voltammetric pulse generator circuit has been developed with CMOS technology and it was integrated with a redox array sensor. The pulse generator circuit consists of a presetter, two counters, a selector, a D flip-flop, an R-2R ladder DAC, and a voltage shifter. We can control the frequency, the square wave amplitude, and the step increment of square wave voltammetry. We confirmed that the square wave pulse and the 64 peak currents are obtained using the pulse generator circuit and 8 × 8 array working electrodes with potassium ferricyanide solution. Each read-out signal of array electrodes is read in sequence using the shift resistor.