Radio Transceiver on a Chip

• US 20120028595A1
• Filed: 08/09/2011
• Published: 02/02/2012
• Est. Priority Date: 02/20/1997
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Gärdenfors, Karl Håkan Torbjörn, Mattisson, Sven, Haartsen, Jacobus Cornelis
• Granted Patent: US 8,626,086 B2
• Time in Patent Office: Days
• US Class Current: 455/230
• CPC Class Codes: H04B 1/3833 Hand-held transceivers
• CPC Class Codes: H04B 1/408 the transmitter oscillator frequency being identical to the receiver local oscillator frequency
• CPC Class Codes: H04B 1/44 Transmit/receive switching
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H04B 2001/7152 with means for suppressing interference
• CPC Class Codes: H04J 3/10 Arrangements for reducing cross-talk between channels
• CPC Class Codes: H04L 27/122 using digital generation of carrier signals digital function generators G06F1/02, H04L17/10; generating pulses having stepped portions using digital techniques H03K4/026
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

An entire radio transceiver can be completely integrated into one IC chip. In order to integrate the IF filters on the chip, a heterodyne architecture with a low IF is used. A single, directly modulated VCO is used for both up-conversion during transmission, and down-conversion during reception. Bond-wires are used as resonators in the oscillator tank for the VCO. A TDD scheme is used in the air interface to eliminate cross-talk or leakage. A Gaussian-shaped binary FSK modulation scheme is used to provide a number of other implementation advantages.

Claims

1. A radio receiver integrated on a single integrated circuit chip comprising:

a heterodyne image-rejection downconversion section configured to down convert, in a single frequency conversion step, a received high frequency signal to a low intermediate frequency signal;

a bandpass channel-selection filter connected to the heterodyne image-rejection downconversion section and configured to perform channel-selection filtering on the low intermediate frequency signal, thereby generating a channel-filtered low intermediate frequency signal; and

a detector connected to the bandpass channel-selection filter and configured to detect a received signal from said channel-filtered low intermediate frequency signal;

wherein the heterodyne image-rejection downconversion section, the bandpass channel-selection filter, and the detector are integrated into said single integrated circuit chip.

2. The radio receiver according to claim 1, wherein the low intermediate frequency signal is centered at about 3 MHz.

3. The radio receiver according to claim 1, wherein the heterodyne image-rejection downconversion section comprises:

a first mixer configured to receive the high frequency signal at an input and to be driven by a local oscillator signal; and

a second mixer configured to receive the high frequency signal at an input and to be driven by a 90-degree phase shifted version of the local oscillator signal.

4. The radio receiver according to claim 3, wherein the heterodyne image-rejection downconversion section further comprises:

phase-shifting circuitry configured to provide a mutual 90-degree phase shift between output signals from the first and the second mixer; and

a combiner for recombining the 90-degree mutually phase shifted output signals from the first and the second mixer, thereby generating the low intermediate frequency signal.

5. The radio receiver according to claim 1, wherein the radio receiver comprises a low noise amplifier, integrated on the single integrated circuit chip, connected to the heterodyne image-rejection downconversion section for providing the received high-frequency signal to the heterodyne image-rejection downconversion section.

6. The radio receiver according to claim 1, wherein the detector comprises a discriminator.