ADI ADRF6720 3G－4G通信系统开发方案

ADI公司的ADRF6720-27是宽带正交解调器,包括高度线性宽带解调器,分数N锁相环(PLL)和四个低相位噪音的多核压控振荡器(VCO),本地(LO)频率从356.25 MHz到2855 MHz,RF输出频率从400MHz到3000MHz, 2140 MHz 的P1dB输出10.8dBm, IP3输出31.1dBm,噪音−159.5 dBm/Hz,边带抑制−40.8 dB,工作电压3.3V,主要用在2G/3G/4G/LTE宽带通信系统,微波点对点通信,卫星调制解调器,军用/航空仪表.本文介绍了ADRF6720-27主要特性,功能框图和基本应用电路,以及评估板ADRF6720-27-EVALZ主要特性,测试建立图,电路图和材料清单与PCB设计文件.
The ADRF6720-27 is a wideband quadrature modulator with an integrated synthesizer ideally suited for 3G and 4G communication systems. The ADRF6720-27 consists of a high linearity broadband modulator, an integrated fractional-N phase-locked loop (PLL), and four low phase noise multicore voltage controlled oscillators (VCOs). The ADRF6720-27 local oscillator (LO) signal can be generated internally via the on-chip integer-N and fractional-N synthesizers, or externally via a high frequency, low phase noise LO signal. The internal integrated synthesizer enables LO coverage from 356.25 MHz to 2855 MHz using the multicore VCOs. In the case of internal LO generation or external LO input, quadrature signals are generated with a divide by 2 phase splitter. When the ADRF6720-27 is operated with an external 1 × LO input, a polyphase filter generates the quadrature inputs to the mixer. The ADRF6720-27 offers digital programmability for carrier feedthrough optimization, sideband suppression, HD3/IP3 optimization, and high-side or low-side LO injection. The ADRF6720-27 is fabricated using an advanced silicon- germanium BiCMOS process. It is available in a 40-lead, RoHS-compliant, 6 mm × 6 mm LFCSP package with an exposed pad. Performance is specified over the −40℃ to +85℃ temperature range.
ADRF6720-27主要特性:
 I/Q modulator with integrated fractional-N PLL
RF output frequency range: 400 MHz to 3000 MHz
 Internal LO frequency range: 356.25 MHz to 2855 MHz
Outp...