Patent ID: 8976278
Filing Date: 2015-03-10
Classification: H04N

Abstract:
1. A digital domain accumulative CMOS-TDI image sensor with low power consumption, comprising a pixel array of n+k lines multiplied m columns, a column parallel signal pre-processing circuit, a column parallel successive approximation (SAR) ADC, a column parallel digital domain accumulator, a column parallel divider, a timing control circuit and an output shift register, wherein n+k+1 coarse quantification memory units are provided to the column parallel digital domain accumulator for storage of coarse quantification results; and memory units for storage of n times of fine quantification results are also provided, thus realizing n stages of TDI signal accumulation after accumulation of n times of fine quantification results; K lines of pre-processing pixels are added into an n×m pixel array (n lines and m columns), the newly added k lines of pre-processing pixels are located to face a direction along which the original pixel array moves towards the object; the coarse quantification memory units, memory units for storage of n times of fine quantification results and the column parallel digital domain accumulator comprise a digital adder, a multiplexer, a memory array A, a memory array B, an one-way bus 1 , a two-way bus 2 , a two-way bus 3 , a two-way bus 4 and an one-way bus 5 ; the memory array A functions to store fine quantification results therein, while the memory array B functions to store coarse quantification results therein; an output end of the SAR ADC is connected to an input end of the digital adder via the one-way bus 1 ; an output end of the digital adder and another input end of the digital adder are connected to the multiplexer through the two-way bus 2 ; a channel B of the multiplexer is connected with the memory array B through the two-way bus 3 ; a channel A of the multiplexer is connected with the memory array A through the two-way bus 4 ; and the memory array B is connected with a DAC of the SAR ADC via the one-way bus 5 .