ADI ADRF6801正交解调器解决方案
ADI公司的 ADRF6801是集成了分数N PLL和VCO的750MH-1150MHz的高动态围的IQ正交解调器，LO的频率为750MH-1150MHz，输入P1dB为12.5 dBm，噪音（DSB）为14.3dB，电压转换增益为5.1dB。正交解调的相位精度为0.3度，放大精度为0.05 dB，主要用在QAM/QPSK RF/IF解调器，蜂窝W-CDMA/CDMA/CDMA2000，微波点对（多）点无线通信，宽带无线和WiMAX。本文介绍了ADRF6801主要特性，功能方框图，基本连接图和评估板电路图，元件数值和布局图以及通用特性，噪音特性和相位噪音测试框图。
The ADRF6801 is a high dynamic range IQ demodulator with integrated PLL and VCO. The fractional-N PLL/synthesizer generates a frequency in the range of 3.0 GHz to 4.6 GHz. A divide-by-4 quadrature divider divides the output frequency of the VCO down to the required local oscillator (LO) frequency to drive the mixers in quadrature. Additionally, an output buffer can be enabled that generates an fVCO/2 signal for external use.
The PLL reference input is supported from 10 MHz to 160 MHz. The phase detector output controls a charge pump whose output is integrated in an off-chip loop filter. The loop filter output is then applied to an integrated VCO.
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