Integrated circuit, transceiver and method for leakage cancellation in a receive path

US8917204B2 · kind B2 · utility

Assignee

• Freeescale Semiconductor, Inc. · US

Inventors

• Saverio Trotta · Hersbruck, DE
• Bernhard Dehlink · Unterhaching, DE
• Ralf Reuter · Landshut, DE

Key dates

• Filing date: Jul 16, 2009
• Grant date: Dec 23, 2014
• Expiry date: Dec 12, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/525
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

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.