Increased time-constant dual-input integrators

Two active-RC integrators are proposed. They provide ideal integration function realization with dual-input capability, the use of a grounded capacitor, and an increase in time-constant ( tau /sub 0/) over its nominal value ( tau ), which is made possible by a single resistor-controlled multiplier. Sensitivity characteristics of the proposed networks are considered. The integrators have been built in the laboratory with mu A 741 amplifiers and using tau =0.4 mu F*10 k Omega and n=1-10. With square-wave testing under continuous tuning, the expected triangular wave generation was observed at the output (V/sub 0/). The variation of the slope lambda =V/sub 0//t of the rising and falling edges of the output triangular wave for different settings of n has been measured; the results are shown. The differential integration function for each network has been tested by feeding two square-wave inputs of the same magnitude (3.6 V), but different periods; the integrator responses are given.<
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