Dual Comparators Match Precision Industrial, Instrumentation Application Needs (.PDF Download)

Dual precision comparators are needed in many designs, such as for industrial and instrumentation applications, to generate accurate pulse-width modulated (PWM) waveforms with very high (>99%) and very low (<1%) duty-cycle percentages. This design idea (Fig. 1) improves on designs based on the common LM311 and LT1011 devices, both of which require resistor pull-ups and have asymmetric timing paths. The features of this new design include matched, short propagation delays (T