Photodiode detector with integrated noise shielding
First Claim
1. A shielded detector comprising:
- a photodetector having an active area exposed to receive light and responsive to light within a band of wavelengths; and
a shield deposited on a portion of said active area, said shield comprising an electrically conductive layer deposited on said portion of said active area, said shield providing an integrated electromagnetic shield for reducing EMI-induced noise in said photodetector, wherein said conductive layer comprises a metallization layer deposited directly on said portion of said active area to form said shield and an electrode for said photodetector, said electrode being substantially electrically isolated from said shield.
6 Assignments
0 Petitions
Accused Products
Abstract
A photodiode has integrated shields for the rejection of noise-producing electromagnetic interference and ambient light. The electromagnetic shield forms a conductive matrix which covers the photodiode active area. The matrix is deposited as a metallization layer onto the photodiode and provides exposed portions of the active area for light detection. A pad is electrically connected to the shield to allow external termination of the shield. The ambient-light shield is in the form of a colored encapsulant surrounding the photodiode. The encapsulant provides a high-pass light transmission characteristic which passes signal light and rejects out-of-band ambient light. The photodiode is particularly advantageous for use in pulse oximetry probes.
-
Citations
5 Claims
-
1. A shielded detector comprising:
-
a photodetector having an active area exposed to receive light and responsive to light within a band of wavelengths; and
a shield deposited on a portion of said active area, said shield comprising an electrically conductive layer deposited on said portion of said active area, said shield providing an integrated electromagnetic shield for reducing EMI-induced noise in said photodetector, wherein said conductive layer comprises a metallization layer deposited directly on said portion of said active area to form said shield and an electrode for said photodetector, said electrode being substantially electrically isolated from said shield. - View Dependent Claims (2)
-
-
3. A shielded detector comprising:
-
a photodetector having an active area to receive light and responsive to light within a band of wavelengths; and
a shield deposited on a portion of said active area, wherein said photodetector comprises a generally planar photodiode, said photodiode having first and second sides, said first side having said active area and said second side having a first electrode for said photodiode, wherein said shield comprises a metallization layer deposited directly on said portion of said active area, said metallization layer forming an electrically conductive grid and a second electrode for said photodiode, said second electrode being substantially electrically isolated from said grid. - View Dependent Claims (4, 5)
-
Specification