Voltage regulation for increased robustness in indirect time-of-flight sensors

A time-of-flight sensing system, comprising:

• a light source configured to emit modulated light to an object;
• and
• a time-of-flight sensor disposed in an integrated circuit chip, wherein the time-of-flight sensor is configured to sense reflected modulated light from the object, wherein the time-of-flight sensor includes:
• a plurality of voltage regulators disposed in an integrated circuit chip;
• a plurality of loads disposed in the integrated circuit chip, wherein each one of the plurality of loads is coupled to a respective one of the plurality of voltage regulators, wherein said each one of the plurality of loads includes:
• a modulation driver disposed in the integrated circuit chip, wherein the modulation driver is coupled to be supplied power from the respective one of the plurality of voltage regulators;
• and
• a grouping of pixel circuits, wherein the grouping of pixel circuits is one of a plurality of groupings of pixel circuits included in a pixel array disposed in the integrated circuit chip, wherein each one of the pixel circuits includes:
• a photodiode configured to photogenerate charge in response to the reflected modulated light incident upon the photodiode;
• a first floating diffusion configured to store a first portion of charge photogenerated in the photodiode;
• and
• a first transfer transistor configured to transfer the first portion of charge from the photodiode to the first floating diffusion in response to a first phase modulation signal generated by the modulation driver;
• and
• a feedback circuit disposed in the integrated circuit chip, wherein the feedback circuit is coupled between a reference one of the plurality of loads and the plurality of voltage regulators, wherein the modulation driver is coupled to receive a feedback signal from the feedback circuit in response to said reference one of the plurality of loads.