Precharged latched pixel cell for a time of flight 3D image sensor

A time of flight sensing system, comprising:

• a light source to emit light pulses to an object;
• a time of flight pixel array having a plurality of pixel cells, wherein each one of the pixel cells comprises:
• a latch having an input terminal and an output terminal, wherein the latch is coupled to provide a latched output signal at the output terminal responsive to the input terminal;
• a first precharge circuit coupled to precharge the input terminal of the latch to a first level during a reset of the pixel cell;
• and
• a single photon avalanche photodiode (SPAD) coupled to provide a SPAD signal to the input terminal of the latch in response to a detection of a photon reflected from the object;
• and
• control circuitry coupled to the light source and to the time of flight pixel array to synchronize a timing of the emission of the light pulses with the sensing of the photon reflected from the object.