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. 23, 2014
Filed:
Jul. 16, 2009
Saverio Trotta, Munich, DE;
Bernhard Dehlink, Unterhaching, DE;
Ralf Reuter, Munich, DE;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
An integrated circuit for cancelling a radio frequency transmit leakage signal comprises: a transmitter portion comprising at least one amplifier stage for transmitting a radio frequency signal to an antenna port; and a first coupler arranged to operably couple the transmitter portion, the antenna port and a receiver portion. The receiver portion is arranged to receive a first composite signal that comprises a received radio frequency signal from the antenna port and the transmit leakage signal. The receiver portion comprises: a first down-conversion circuit arranged to receive the first composite signal and a local oscillator signal such that the first down-conversion circuit outputs a down-converted composite signal at a first intermediate frequency signal; and a second coupler arranged to receive the down-converted first composite signal at the first intermediate frequency signal and a phase shifted version of the local oscillator signal such that the phase shifted version of the local oscillator signal is arranged to cancel at least a portion of the transmit leakage signal from the down-converted first composite signal.