[原创] ADI ADL5380 0.4－6GHz雷达系统直接变换接收器开发方案

ADI公司的ADL5380是宽带正交I-Q解调器,RF/IF输入频率从400MHz到6GHz,900MHz时的NF = 10.9 dB, IP1dB = 11.6 dBm, IIP3 = 29.7 dBm;单电源5V工作,主要用在蜂窝W-CDMA/GSM/LTE,微波点对点无线电, 宽带无线和WiMAX.本文介绍ADL5380主要特性,功能框图,典型应用电路和输入六阶低通巴特沃斯(Butterworth)带通滤波器电路图,以及开发平台AD-FMCOMMS6-EBZ主要特性,电路图和PCB元件布局图.

The ADL5380 is a broadband quadrature I-Q demodulator that covers an RF/IF input frequency range from 400 MHz to 6 GHz. With a NF = 10.9 dB, IP1dB = 11.6 dBm, and IIP3 = 29.7 dBm @ 900 MHz, the ADL5380 demodulator offers outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF inputs provide a well-behaved broadband input impedance of 50 Ω and are best driven from a 1:1 balun for optimum performance.

Excellent demodulation accuracy is achieved with amplitude and phase balances of ~0.07 dB and ~0.2°, respectively. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered and provide a voltage conversion gain of ~7 dB. The buffered baseband outputs are capable of driving a 2 V p-p differential signal into 200 Ω.
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