预失真多合体功率放大器ACLR与反馈通道带宽的关系  

Relationship between the ACLR of digital pre-distortion doherty power amplifier and the feedback channel bandwidth

作　　者：邱岱[1] 潘文生[1] 卿朝进[2] 唐友喜[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,四川成都610054 [2]西华大学电气信息学院,四川成都610039

出　　处：《电子技术应用》2012年第12期90-93,共4页Application of Electronic Technique

基　　金：国家自然科学基金资助项目(60832007;60901018;60902027);国家重大科技专项(2009ZX03003-008-01);国家863计划(2009AA01Z236);四川省教育厅项目(12ZA161);教育部春晖计划(Z2011091);西华大学校重点项目(Z1120941);博士后科学基金项目(2012M511920)

摘　　要：针对TI公司数字预失真芯片GC5322和Xilinx公司的数字预失真知识产权核(IP Core),考虑输入九载波TD-SCDMA信号,测试了数字预失真多合体功率放大器的反馈通道带宽与邻道及次邻道泄漏功率比(ACLR)的关系。测试结果表明,当反馈通道带宽大于信号带宽1.7倍时,再增加反馈通道带宽,ACLR的改善量变化不明显,在±1.3 dB范围内波动;当反馈通道带宽小于信号带宽1.7倍以下时,再降低反馈通道带宽,ACLR的改善量恶化明显。该结果对工程实现时选取最低反馈通道带宽,降低系统对模数转换器(ADC)的指标要求和器件成本,具有重要的参考和应用价值。The relationship between the ACLR of digital pre-distortion doherty power amplifier and the feedback channel bandwidth is investigated based on the DPD chip of GC5322 from Texas Instmment, and DPD IP Core from Xilinx respectively. TDSCDMA 9-carrier signal is used. Results show that when the feedback channel bandwidth is greater than 1.7 times the signal bandwidth, ACLR improvement is fluctuating within ± 1.3 dB; when the feedback channel bandwidth is less than 1.7 times the signal bandwidth, the ACLR improvement degraded obviously. This result has important reference and application value for engineering practice to decide the minimum feedback channel bandwidth, so as to reduce the requirement and costs of ADC parts in system.

关 键 词：数字预失真 反馈通道 TD-SCDMA多载波信号 邻道及次邻道泄漏功率比 多合体功率放大器 

分 类 号：TN830.6[电子电信—信息与通信工程]