ANALOG-TO-DIGITAL CONVERTER WITH GRAY COUNTER

Original (Chinese)

An analog-to-digital converter (ADC) includes a plurality of ADC circuits. Each ADC circuit is associated to a pixel group of a pixel array and includes a storage circuit including a plurality of storage cells. The ADC also includes a shared counter circuit having a counter control connection to apply a clock signal and a plurality of counter output connections. The shared counter circuit is configured to generate a respective counter bit in response to a counter state of the counter circuit. A respective one of the storage cells is connected to a respective one of the counter output connections for storing the respective counter bit. The shared counter circuit comprises a Gray ripple counter. The ADC further includes a delay circuit. The delay circuit is arranged on at least one of the counter output connections between the counter circuit and a corresponding storage cell.