Schmitt Trigger Comparator with Zero-DC Stable Hysteresis

The patent introduces an intermediary mechanism (curved capacitor configuration and switched capacitor network) that mediates between the supply voltage and the threshold voltage generation. This intermediary structure creates an artificial reference that is less sensitive to PVT variations, allowing extended hysteresis range while maintaining stability through the mediating effect of the curved capacitor geometry and switching network.

The patent applies parameter changes by modifying the physical geometry of the capacitor (curved configuration) and dynamically changing operational parameters through switching networks. The curved capacitor geometry changes the electric field distribution to reduce sensitivity to process variations, while the switching network dynamically adjusts capacitance values to maintain stable threshold voltages across PVT conditions.

The patent replaces continuous DC operation with periodic action through the use of switched capacitor networks. The capacitors are charged and discharged in periodic cycles controlled by clock signals, achieving the threshold voltage comparison function through periodic sampling rather than continuous current flow. This periodic action maintains precision while dramatically reducing average DC current consumption.

The patent substitutes the traditional voltage comparator mechanism (which relies on continuous current flow through resistive dividers and amplifier stages) with a capacitor-based switching mechanism. This substitution replaces the mechanical/electrical continuous operation with a field-based periodic operation, achieving the same comparison function with minimal power consumption.

The patent replaces the continuous operation of resistive dividers with periodic capacitor charging/discharging cycles. The threshold voltages are established by charging capacitors to reference levels during specific clock phases, then maintaining these voltages without continuous current flow. This periodic action preserves the ease of threshold setting while eliminating continuous DC consumption.

The patent extracts the essential function of voltage threshold setting from the continuous current-consuming resistive divider and implements it through discrete capacitor charging events. By taking out the continuous current path and replacing it with periodic charge transfer, the threshold setting function is preserved while the harmful continuous current consumption is removed.