ADIADL5387正交解调器解决方案

来源：<a href='http://bbs.hqew.com/viewthread.php?tid=488327' target='_blank'>wanghuixiang</a> 作者：华仔浏览：1001 时间：2016-08-10 14:18

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摘要： ADI的ADL5387宽带正交解调器的RF/IF频率范围从50MHz到2GHz,NF=13dB,IP1dB=13dBmandIIP3=30dBm,有杰出的动态范围,广泛应用在QAM/QPSK解调器,WCDMA/CDMA/CDMA2000/GSM以及点到(多)点无线电收发,CATV以及WiMAX.本文介绍了ADL5387的主要性能,应用领域以及评估板电路图和所用的元器件.50MHzto2GHzQuadratureDemodulatorPreliminaryTechnicalDataADL5387TheADL5387isabroadbandquadratureI-QdemodulatorthatcoversanRF/IFinputfrequencyr

ADI的ADL5387宽带正交解调器的RF/IF频率范围从50MHz到2GHz, NF = 13dB, IP1dB = 13dBm and IIP3 = 30dBm,有杰出的动态范围,广泛应用在QAM/QPSK解调器,WCDMA/CDMA/CDMA2000/GSM以及点到(多)点无线电收发,CATV以及WiMAX.本文介绍了ADL5387的主要性能,应用领域以及评估板电路图和所用的元器件.

50 MHz to 2 GHz Quadrature Demodulator Preliminary Technical Data ADL5387
The ADL5387 is a broadband quadrature I-Q demodulator that covers an RF/IF input frequency range from 50 MHz to 2 GHz. With a NF = 13dB, IP1dB = 13dBm and IIP3 = 30dBm, the demodulator offers outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF/IF inputs provide a well-behaved broadband input impedance of 50 Ω and should be driven from a 1:1 balun for best performance.

Ultra-broad-band operation is achieved with a divide-by-two method for LO quadrature generation. Over a wide range of local oscillator (LO) levels, excellent demodulation accuracy is achieved with amplitude and phase balances ~0.1 dB and ~0.5o, respectively. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered. The ADL5387 provides voltage conversion gain of 4 dB when driving a 500 Ω differential load.

The fully balanced design minimizes effects from second-order distortion. The leakage from the LO port to the RF port is less than −60 dBc. Differential dc-offsets at the I and Q outputs are less than 10 mV. Both of these factors contribute to the excellent IIP2 of greater than 60 dBm.
The ADL5387 operates off a 4.75 V to 5.25 V supply. The supply current is programmable with an external resistor from the BIAS pin to ground. The ADL5387 is fabricated using Analog Devices’ advanced Silicon-Germanium bipolar process and is available in a 24-lead exposed paddle LFCSP. Performance is specified over a −40oC to +85oC temperature range.

主要特性:
I/Q Demodulators
RF frequency:50 MHz to 2GHz
LO input at 2xfLO
100 MHz to 4GHz
IIP3 +30 dBm
Input P1dB +13dBm
NF 13.5 dB @ 450MHz
Voltage Conversion Gain 4dB
Quadrature demodulation accuracy
Phase accuracy ~ 0.5°
Amplitude balance ~ 0.1 dB
LO input –10 to 5 dBm
Demodulation bandwidth ~240 MHz
I/Q Drive 2Vpk -pk into 200Ω
Programmable power consumption
应用:
QAM/QPSK demodulator
W-CDMA/CDMA/CDMA2000/GSM
Point-to-(Multi) Point Radio
CATV
Wireless local loop
WiMax

图1. ADL5387方框图.

图2.ADL5387评估板电路图

评估板所用元器件:

详情请见数据表:

http:///UploadedFiles/Data_Sheets/ADL5387.pdf

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N76E003AT20	NUVOTON	￥9.67

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