Patent ID: 8969781
Filing Date: 2015-03-03
Classification: G01J,G01N,H03F

Abstract:
1. An optical biosensor pixel, comprising: an integrated photodiode configured to convert an incident photon flux into a current; an integrated optical filter coupled to said integrated photodiode, wherein said integrated optical filter is configured to select specific wavelengths and/or photon flux angles to reach said integrated photodiode from a biological sample; a trans-impedance amplifier coupled to said integrated photodiode, wherein said trans-impedance amplifier is configured to convert said current into a voltage signal; a quantizer circuit coupled to said trans-impedance amplifier, wherein said quantizer circuit is configured to convert a value of said voltage signal into a digital value; a charge injection circuit coupled to said quantizer circuit, wherein said charge injection circuit is configured to place a fixed amount of net charge directly added to or subtracted from an input of said trans-impedance amplifier; and a feedback network coupled to said quantizer circuit, wherein said feedback network comprises said charge injection circuit, wherein said feedback network is configured to control an operation of said charge injection circuit based on values of said digital value.