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. 31, 2013
Filed:
Aug. 19, 2010
Ahmad Mirzaei, San Diego, CA (US);
Hooman Darabi, Laguna Niguel, CA (US);
Amir Hadji-abdolhamid, Aliso Viejo, CA (US);
Ahmad Mirzaei, San Diego, CA (US);
Hooman Darabi, Laguna Niguel, CA (US);
Amir Hadji-Abdolhamid, Aliso Viejo, CA (US);
Broadcom Corporation, Irvine, CA (US);
Abstract
According to one embodiment, an improved preamplification chain for implementation in a transmitter comprises a frequency conversion stage for up-converting a baseband signal to a transmit signal, a variable gain control power amplifier driver for preamplifying the transmit signal, and a differential feedback calibration stage receiving first and second differential outputs of a current steering unit of the power amplifier driver and providing calibration feedback to a baseband signal generator of the transmitter. In one embodiment, the frequency conversion stage includes an adjustable low-pass filter for filtering the baseband signal, a passive mixer for up-converting the baseband signal to the transmit signal, and a clock conversion unit configured to convert a fifty percent (50%) duty cycle clock input to a twenty-five percent (25%) duty cycle clock output for driving the passive mixer.