Abstract: This application note presents measured performance data for the MAX2265 power amplifier (PA) when used for EDGE 8PSK modulation. +18.5dBm power was obtained in the 925MHz to 960MHz band. With a 5V power supply, 340mA were used to provide EVM better than 1%. Additional Information: Wireless Product Line Page Quick View Data Sheet for the MAX2265 Applications Technical Support Introduction Many GSM operators are beginning to install 2G networks to support higher data rates, addressing the expected demands of mobile-phone users. EDGE, which stands for "Enhanced Data Rates for GSM Evolution," essentially triples the existing GSM data rate from 1-bit/symbol GMSK (gaussian minimum shift key) modulation to 3 bits/symbol 8PSK (phase shift key) while operating in the same occupied channel bandwidth. The newly adopted modulation scheme of 8PSK requires a highly linear amplifier to minimize spectral regrowth and phase distortion. Power amplifiers for base station applications impose even more stringent requirements for its pre-driver to present a pristine signal with minimum non-linearity. As usual, the pre-driver must be electrically and thermally stable with good reliability for this application. The MAX2265 is an excellent low-cost bipolar solution for GSM/EDGE base station down link pre-driver applications. Performance specifications are presented in this application note. Measured data indicates that the MAX2265 meets or exceeds requirements with margin. Table 1. EDGE Pre-Driver Specification and MAX2265 Measured Data Parameter Customer Spec Measured Data Units Reference/Notes Supply Voltage 5.0 5.0 V - Supply Current - 340 mA POUT = +18.5dBm Frequency Range 925 - 960 925 - 960 MHz - POUT +17.5 +18.5 dBm EDGE Mode Gain 20 24.5 dB - Spurious at 400kHz offset -70 -71 dBc Measured in 30kHz BW Spurious at 600kHz offset -80 -83 dBc Measured in 30kHz BW EVM (average) 1 0.98 % - Figure 1. EDGE modulation spectrum plot at 960MHz and +18.5dBm POUT. Figure 2. EDGE EVM at 960MHz and +18.5dBm output power. Figure 3. EDGE mode transmit output power plot. Figure 4. S21 and S12 small signal plots. Figure 5. S11 and S22 small signal plots. 관련 부품   APP 1829: Jan 09, 2003 MAX2265 2.7V, 단일 전원, 셀룰러 대역 선형 전력 증폭기 전체 데이터 시트 (PDF, 232kB) 무료 샘플 자동 업데이트 관심 분야의 애플리케이션 노트가 나올 때 자동으로 업데이트를 원하십니까? 그렇다면 EE-Mail™을 신청하십시오. We Want Your Feedback! 의견을 보내주세요! 위 내용이 도움이 되셨나요? 여러분의 의견을 기다립니다 — Maxim은 보내주신 정정이나 제안사항을 반영하고 있습니다. 이 페이지를 평가하고 의견을 보내주십시오.   다운로드, PDF 형식 (85kB)  AN1829, AN 1829, APP1829, Appnote1829, Appnote 1829