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:
Dec. 25, 2018
Filed:
Sep. 29, 2016
Maxim Integrated Products, Inc., San Jose, CA (US);
Chen-Hsien Hung, Dallas, TX (US);
Tao Huang, Plano, TX (US);
Shiau Chwun George Pwu, Frisco, TX (US);
Maxim Integrated Products, Inc., San Jose, CA (US);
Abstract
A start-up control for a transmitter (TX) output driver is implemented to prevent the stick state problem when the TX driver is not toggling. TX output driver is set in a high impedance (HZ) mode when data zero is delivered from the digital base band (DBB) and set in an enhanced mode to deliver a stronger signal when data one is delivered from the DBB. The transmitter comprises a dual-loop PLL to synchronize the TX output pulse and the carrier. The dual-loop PLL is composed of a relaxation oscillator, a 1Loop, and a 2Loop. The 1loop is a voltage-controlled oscillator comprising the relaxation oscillator and an operational transconductance amplifier. The 2loop is a loop comprising a phase frequency detector, a charge pump, a loop filter and the VCO of the 1loop.