The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 2018
Filed:
Dec. 05, 2016
Oracle International Corporation, Redwood Shores, CA (US);
Saman Saeedi, Redwood City, CA (US);
Frankie Y. Liu, Palo Alto, CA (US);
Suwen Yang, Mountain View, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
An optical receiver receives a photocurrent from a photosensor and uses a transimpedance element to convert the photocurrent into an input voltage signal. An amplifier then amplifies the input voltage signal to produce a receiver output. During this process, a reference-voltage-generation circuit generates a reference voltage for the amplifier. This reference-voltage-generation circuit includes a data-detection circuit that detects data on the input voltage signal, and an adjustable low-pass filter, which filters the input voltage signal to produce the reference voltage. During a faster operating mode, which occurs when the data-detection circuit does not detect data on the input voltage signal, the filter has a cutoff frequency f. During a slower operating mode, which starts a bias-delay time tafter the data-detection circuit detects data on the input voltage signal, and lasts until the data-detection circuit no longer detects data, the filter has a lower cutoff frequency f.