Time-of-flight sensor and method of calibrating errors in the same

A test system comprising:

• a time-of-flight (ToF) sensor;
• and
• a test device configured to measure a wiggling error of the ToF sensor,
• the ToF sensor comprising:
• a light source configured to illuminate a test object with a transmission light that is modulated based on a modulation signal;
• a buffer chain circuit configured to generate a plurality of demodulation signals having different local delay phases;
• and
• a pixel array including a plurality of pixels configured to sample a reception light reflected from the test object based on the plurality of demodulation signals, the plurality of pixels being grouped into a plurality of pixel groups, each pixel group receiving the plurality of demodulation signals having each local delay phase.

A time-of-flight (ToF) sensor comprising:

• a light source configured to illuminate a test object with a transmission light that is modulated based on a modulation signal;
• a buffer chain circuit configured to generate a plurality of demodulation signals having different local delay phases;
• and
• a pixel array including a plurality of pixels configured to sample a reception light reflected from the test object based on the plurality of demodulation signals, the plurality of pixels being grouped into a plurality of pixel groups, each pixel group receiving the plurality of demodulation signals having each local delay phase.