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:
Aug. 07, 2012
Filed:
Jan. 23, 2008
Charles Leroy Sobchak, Davie, FL (US);
Mahibur Rahman, Chandler, AZ (US);
Manish N. Shah, Vernon Hills, IL (US);
Charles LeRoy Sobchak, Davie, FL (US);
Mahibur Rahman, Chandler, AZ (US);
Manish N. Shah, Vernon Hills, IL (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
An IPtuning circuit (and) for tuning the IPof a mixer (and) to minimize second order intermodulation distortion (IMD) in a receiver (and) of a transceiver (and). An operating characteristic of the mixer related to IMDis changeable by changing a value of a setting of the mixer. Two tones outside a bandpass of the receiver are injected into the mixer and a calibration tone within the bandpass is produced as a result of IMD. Alternatively, a DSSS signal is injected into the mixer and the calibration tone is produced at a chip rate of the DSSS signal. The power of the calibration tone is measured at a plurality of values of the settings. Alternatively, a four-level PN DSSS signal of known content is injected into the mixer, and a two-level PN DSSS signal of known content produced therefrom is correlated with a two-level PN DSSS signal of known content produced by a squaring circuit ().