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:
May. 14, 2013
Filed:
Jun. 26, 2009
Pushp Trikha, San Diego, CA (US);
Tzu-wang Pan, Saratoga, CA (US);
Eugene Yang, San Diego, CA (US);
Yi Zeng, Fremont, CA (US);
I-hsiang Lin, Mountain View, CA (US);
TG Vishwanath, San Diego, CA (US);
Pushp Trikha, San Diego, CA (US);
Tzu-wang Pan, Saratoga, CA (US);
Eugene Yang, San Diego, CA (US);
Yi Zeng, Fremont, CA (US);
I-Hsiang Lin, Mountain View, CA (US);
Tg Vishwanath, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A frequency modulation (FM) transmitter implemented with a delta-sigma modulator and a phase-locked loop (PLL) is described. The delta-sigma modulator receives a modulating signal (e.g., an FM stereo multiplex (MPX) signal) and provides a modulator output signal. The PLL performs frequency modulation based on the modulator output signal and provides an FM signal. The FM transmitter may further include a gain/phase compensation unit and a scaling unit. The compensation unit may compensate the modulating signal for the closed-loop response of the PLL. The scaling unit may scale the amplitude of the modulating signal based on a gain to obtain a target frequency deviation for the FM signal. The PLL may operate in a transmit mode or a receive mode, may perform frequency modulation in the transmit mode, and may provide a local oscillator (LO) signal at a fixed frequency in the receive mode.