Patent Number: 7,612,322

Title: Temperature-compensated high dynamic range optical receiver

Abstract: A light sensor having a photocurrent subsection and an interface circuit is disclosed. The photocurrent subsection includes a photodetector, an amplifier, a diode and an impedance element. The first photodetector generates a current between a first node and a power rail in response to being illuminated with light. The interface circuit generates an output signal that is related to the logarithm of the intensity of light that is incident on the photodetector. The impedance element is constructed in a manner that compensates for the thermal dependency of the impedance through the diode. Additional photocurrent subsections can be added to further reduce the thermal dependency of the output signal.

Inventors: Lum; Richard Kok Keong (Singapore, SG), Chen; Lei (Singapore, SG)

Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.

International Classification: G01J 1/44 (20060101); H03F 3/08 (20060101); H04B 10/06 (20060101)

Expiration Date: 1/03/02017