Temperature-compensated high dynamic range optical receiver

Details Temperature-compensated high dynamic range optical receiver Temperature-compensated high dynamic range optical receiver

2007-02-15

2009-11-03

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140AG, C398S209000

Reexamination Certificate

active

07612322

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.

REFERENCES:
patent: 5361637 (1994-11-01), Judd et al.
patent: 2007/0086791 (2007-04-01), Noya et al.
patent: 2008/0101803 (2008-05-01), Lum et al.

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