Intel Corporation

Level One Communications, Inc.

Donald E MacNally

Thomas Byunghak Cho

An antenna interface for a Time Division Duplex (TDD) radio transceiver allows a transceiver to be attached to an antenna/filter without the need for an antenna switch. The antenna interface includes a single Balun circuit to convert a single-ended signal to/from differential signals, and a single impedance matching circuit to match an impedance at an output of the single Balun circuit with an input impedance of a Low Noise Amplifier (LNA) of a receiver and to provide an output impedance of a Power Amplifier (PA) of a transmitter. The single impedance matching circuit is coupled to both the LNA and the PA. The LNA and the PA are based on CMOS technology and made within a single integrated circuit.

Antenna interface

A direct conversion type transceiver system incorporates an offset correction and automatic gain control system. The automatic gain control system includes an amplifier amplifying a baseband signal which is directly converted from a received incoming RF signal, a feedback offset canceller controllably canceling DC offset, an automatic gain controller controlling gain of the amplifier, and a feed forward offset canceller coupled to a signal peak detector. The signal peak detector controlling the automatic gain controller and the feed forward offset canceller simultaneously, the feed forward offset canceller further canceling the DC offset.

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San Francisco, CA, United States of America

Donald E MacNally