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:
Aug. 27, 2019
Filed:
Aug. 31, 2018
Futurewei Technologies, Inc., Plano, TX (US);
Liang Gu, San Jose, CA (US);
Yuming Cao, Pleasanton, CA (US);
Yen Dang, San Jose, CA (US);
Gong Lei, Sunnyvale, CA (US);
Yifan Gu, Santa Clara, CA (US);
Hung-Yi Lee, Cupertino, CA (US);
Mamatha Deshpande, San Jose, CA (US);
Shou-Po Shih, Cupertino, CA (US);
Miao Liu, Pudong District, CN;
Futurewei Technologies, Inc., Plano, TX (US);
Abstract
A reference-less frequency detector circuit includes a sampling circuit that is configured to generate a frequency control voltage and a switch circuit control signal based on a frequency difference between a clock signal frequency and an input data rate. The frequency control voltage has a frequency down indication and a frequency up indication. A voltage-to-current converter circuit is coupled to the sampling circuit and is configured to convert the frequency control voltage to a frequency control current based on the switch circuit control signal. The voltage-to-current converter circuit includes an output switch circuit controlled by the switch control signal and is configured to have substantially equal respective latencies for the frequency down indication and the frequency up indication.