Browse Prior Art Database

DUAL BAND INTEGRATED POWER AMPLIFIER WITH SWITCHABLE INTERSTAGE MATCH

IP.com Disclosure Number: IPCOM000008180D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-23
Document File: 2 page(s) / 88K

Publishing Venue

Motorola

Related People

Bill Beckwith: AUTHOR

Abstract

The popularity of cellular communication services has spurred the proliferation of new personal communications systems, resulting in the demand for multi-band and multi-mode telephones. In Europe, the new DCS1800 system is gaining popularity, and will soon share the airwaves with the widely implemented Global System for Mobile communications, GSM. Because of the overlapping coverage of these two systems, a high demand for GSM/DCS1800 dual-band phones is expected. The popularity of DCS1800 is due to its similarities to GSM, however, the two systems operate at different frequency bands with different RF power require- ments. One challenge to realizing the dual-band phone is the implementation of the RF power amplifier. This paper describes an integrated power amplifier (IPA) with a switchable interstage match- ing network which was designed for GSM/DCS 1800 dual-band operation.

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MOTOROLA Technical Developments

DUAL BAND INTEGRATED POWER AMPLIFIER WITH SWITCHABLE INTERSTAGE MATCH

by Bill Beckwith

  The popularity of cellular communication services has spurred the proliferation of new personal communications systems, resulting in the demand for multi-band and multi-mode telephones. In Europe, the new DCS1800 system is gaining popularity, and will soon share the airwaves with the widely implemented Global System for Mobile communications, GSM. Because of the overlapping coverage of these two systems, a high demand for GSM/DCS1800 dual-band phones is expected. The popularity of DCS1800 is due to its similarities to GSM, however, the two systems operate at different frequency bands with different RF power require- ments. One challenge to realizing the dual-band phone is the implementation of the RF power amplifier. This paper describes an integrated power amplifier (IPA) with a switchable interstage match- ing network which was designed for GSM/DCS 1800 dual-band operation.

  The GSM transmit frequency band is 880 MHz to 915 MHz with a RF power level requirement of +34 dBm. For DCS1800, the transmit band is 1710 MHz to 1785 MHz with a required power of +32 dBm. The design goal was to use a single PA to meet the requirements of both systems. An alternate approach could be to use a separate PA for each band, however, the increased component count and cost of such an arrangement make this approach undesirable.

  A 2-stage GaAs integrated power amplifier (IPA) was designed to meet the requirements of both G...