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:
Jul. 23, 2013
Filed:
Jul. 15, 2010
Janakiram G. Sankaranarayanan, San Diego, CA (US);
Bhushan S. Asuri, San Diego, CA (US);
Vinod V. Panikkath, San Diego, CA (US);
Hongyan Yan, San Diego, CA (US);
Himanshu Khatri, San Diego, CA (US);
Maulin Bhagat, San Diego, CA (US);
Janakiram G. Sankaranarayanan, San Diego, CA (US);
Bhushan S. Asuri, San Diego, CA (US);
Vinod V. Panikkath, San Diego, CA (US);
Hongyan Yan, San Diego, CA (US);
Himanshu Khatri, San Diego, CA (US);
Maulin Bhagat, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
An RF transmitter capable of transmitting over a wide range of frequencies includes a mixer, a wideband high-Q balun, a first driver amplifier and a second driver amplifier. The balun has a single primary winding and two secondary windings. A differential output of the mixer is coupled to the primary winding. A first of the two secondary windings is coupled to drive the first driver amplifier. A second of the two secondary windings is coupled to drive the second driver amplifier. One driver amplifier is used when transmitting at lower frequencies whereas the other driver amplifier is used when transmitting at higher frequencies. By appropriate sizing of the inductances of the secondary windings and by switching out one of the secondary windings at certain times, the balun is tunable to operate over the wide frequency range while having a high quality factor Q, thereby facilitating reduced power consumption while simultaneously meeting performance requirements.