Patent ID: 8686367
Filing Date: 2014-04-01
Classification: G01S,H01L

Abstract:
1. An apparatus, comprising: a photodiode configured to accumulate image charge, over an accumulation period, in response to each non-visible light pulse emitted from a light source that becomes incident upon the photodiode; a first storage transistor configured to store, over multiple accumulation periods, a first sum of a first portion of the image charge, wherein the accumulation period is among the multiple accumulation periods; a first transfer transistor coupled between the photodiode and the first storage transistor to selectively transfer the first portion of the image charge from the photodiode to the first storage transistor for storing over the multiple accumulation periods; a first output transistor coupled to the first storage transistor to selectively transfer the first sum of the first portion of the image charge to a readout node; a second storage transistor configured to store, over the multiple accumulation periods, a second sum of a second portion of the image charge; a second transfer transistor coupled between the photodiode and the second storage transistor to selectively transfer the second portion of the image charge from the photodiode to the second storage transistor for storing over the multiple accumulation periods; and a second output transistor coupled to the second storage transistor to selectively transfer the second sum of the second portion of the image charge to the readout node.