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A novel low power time-mode comparator with enhanced resolution and speed is proposed in this paper. The comparator incorporates a symmetrical input time-to-digital converter (TDC) and a highly dynamic voltage-to-time converter (VTC). Energy reduction is achieved mainly through the use of capacitor discharge automatic switch-off and inverter clocking. The combined effect of the low timing requirement and capacitor voltage presetting enables significant precision and speed improvements. Simulations in a 0.18um process show that the comparator can be clocked at 38MHz, draws less than 0.4pJ energy from supply and can resolve voltages as low as 10µV.

A novel low power time-mode comparator for successive approximation register ADC