Integrated optical biosensor array including charge injection circuit and quantizer circuit
US8969781B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2012 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | Oct 31, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical biosensor pixel for detecting the amount of light that is generated by the biosensing process and a biosensor array architecture that includes such biosensor pixels. The optical biosensor pixel includes a photodiode configured to convert an incident photon flux into a current. Additionally, the optical biosensor pixel includes an optical filter configured to select specific wavelengths and/or photon flux angles to reach the photodiode from a biological sample. The biosensor pixel further includes a trans-impedance amplifier coupled to the photodiode, where the trans-impedance amplifier is configured to convert the current into a voltage signal. Additionally, the biosensor pixel includes a 1-bit comparator coupled to the trans-impedance amplifier and a 1-bit digital-to-analog converter coupled to the 1-bit comparator, where the 1-bit digital-to-analog converter injects different levels of charge into an input of the trans-impedance amplifier at each cycle based on an output of the 1-bit comparator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.