Transceiver

Details Transceiver Transceiver

2008-06-08

2011-12-27

Pham, Tuan (Department: 2618)

Telecommunications

Transmitter and receiver at same station

C455S076000, C455S091000, C455S088000, C455S118000

Reexamination Certificate

active

08086188

ABSTRACT:
The transmitter of the transceiver includes: a transmitter-side mixers of a transmitter-side modulator; a transmitter-side voltage-controlled oscillator; and a transmitter-side divider. The divider having a dividing factor of a non-integral number is supplied with an oscillating output of the oscillator. A pair of non-quadrature local signals having a phase difference of 90° plus a predetermined offset angle is produced by the divider and supplied to the mixers. The transmitter includes a phase-shift unit which converts a pair of quadrature transmit signals having a phase difference of about 90° on an analog basis into a pair of non-quadrature shifted transmit signals. Consequently, quadrature modulation is performed by the mixers. Use of a similar configuration enables the reduction in interference of an RF signal with local signals supplied to receiver-side mixers of the receiver.

REFERENCES:
patent: 2003/0190905 (2003-10-01), Carpineto
patent: 2004/0033785 (2004-02-01), Kasahara et al.
patent: 2008/0160945 (2008-07-01), Crinon et al.
patent: 2003-152558 (2003-05-01), None
patent: 2003-324366 (2003-11-01), None
Abdellatif Bellaouar, “RF Transmitter Architectures for Integrated Wireless Transceivers”, The Eleventh International Conference on Microelectronics, 1999, Nov. 22-24, 1999, pp. 25-30.
Gabriel Brenna et al., “A 2-GHz Carrier Leakage Calibrated Direct-Conversion WCDMA Transmitter in 0.13μm CMOS” IEEE Journal of Solid-State Circuits, vol. 39, No. 8, Aug. 2004, pp. 1253-1262.
Rahul Magoon et al., “A Single-Chip Quad-Band (850/900/1800/1900 MHz) Direct Conversion GSM/GPRS RF Transceiver Fractional-NSynthesizer”, IEEE Journal of Solid-State Circuits, vol. 37, No. 12 Dec. 2002, pp. 1710-1720.

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