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. 17, 2016
Filed:
Feb. 06, 2015
Qualcomm Incorporated, San Diego, CA (US);
Jae-Hong Chang, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
Certain aspects of the present disclosure generally relate to automatic amplitude control of an oscillating signal output from a voltage-controlled oscillator (VCO) using feedback from an amplitude adjustment circuit. The VCO may comprise cross-coupled metal oxide semiconductor (MOS) transistors coupled to a resonant tank circuit. Gates of the cross-coupled transistors are configured to control an amplitude of the oscillating signal generated by the resonant tank circuit. In certain aspects, the amplitude adjustment circuit may comprise a peak detector that generates a signal that is representative of the amplitude of the oscillating signal. The signal generated by the peak detector may be compared to a reference voltage by an amplifier. The amplifier may generate a feedback signal to control the gates of the cross-coupled MOS transistors based on the comparison, thereby adjusting the amplitude of the oscillating signal.