Charge Pump Ripple Reduction via Phase-Shifted Latch Comparators

The single static comparator is segmented into multiple latch comparators (first latch comparator, second latch comparator, etc.) that operate in parallel. Each latch comparator samples the charge pump output at different phases of the clock signal, providing multiple measurement opportunities within each clock cycle. This segmentation allows the system to detect the target voltage more precisely without being limited by the response time of a single comparator.

The latch comparators are triggered by phase-shifted clock signals (e.g., first clock signal and second clock signal with different phases) to perform periodic sampling of the charge pump output. This periodic action at multiple phase points allows the system to capture the voltage trajectory throughout the clock cycle, enabling more accurate detection of when the target voltage is reached and reducing overshoot.

The latch comparators perform preliminary sampling and detection of the charge pump output at multiple phase points before the charge pump completes its charging cycle. By detecting the target voltage at earlier phase points (e.g., using phase-shifted clock signals), the system can trigger the disable signal in advance, allowing the charge pump to be disabled before it would otherwise overshoot the target voltage.

The system implements feedback through the latch comparators that continuously monitor the charge pump output and provide detection signals back to the charge pump control. The feedback mechanism uses multiple latch comparators sampling at different phases to provide more frequent and accurate feedback about the voltage level, enabling timely adjustment of the charge pump operation to maintain voltage stability.

Multiple latch comparators are merged into a unified detection system where their outputs are combined through logic circuitry. The first latch comparator, second latch comparator, and subsequent comparators all feed into a common detection mechanism that determines when the target voltage has been reached. This merging allows the system to leverage multiple samples while presenting a single coordinated detection function, reducing the apparent complexity compared to independent comparator systems.

The latch comparators are designed with multi-functionality, serving both as voltage comparison elements and as phase-sampled measurement points. Each latch comparator not only compares the charge pump output against the target voltage but also inherently provides temporal sampling at its specific phase point. This universality allows multiple measurement functions to be achieved with a single comparator structure, reducing overall system complexity.