Patent ID: 6982406
Filing Date: 2006-01-03
Classification: G01J,H01L,H04N

Abstract:
1. A CMOS light-to-current sensor chip supported on a semiconductor substrate comprising: a p-n junction photo-diode having a photo-current generating node; a first MOS transistor functioning as a transistor load having a drain terminal and a gate terminal connected to the photo-current generating node of said p-n junction photo-diode, and a source terminal connected to a voltage supplying node; and a second MOS transistor functioning as a current-mirror transistor of said first MOS transistor having a gate terminal connected to the gate terminal of said first MOS transistor, a source terminal connected to the source terminal of said first MOS transistor, and a drain terminal for outputting a substantially linearly amplified current proportional to the photo-generated current of said photo-diode to an external resistor load.