ADI ADRF6655 100-2500 MHz有源混频方案

ADI 公司的ADRF6655是集成了PLL和VCO的高动态范围的有源混频器, 输入频率范围100MHz - 2500 MHz,内部LO频率范围从1050 MHz 到2300 MHz,输入P1dB为12dBm,输入IP3为29dBm,噪音(SSB)为12dB,电压转换增益6dB,200欧姆输出匹配阻抗. ADRF6655主要用在宽带通信设备如点对点微波通信,无线基站,国防宽带和软件定义无线电(SDR),蜂窝中继器以及通信测试设备.本文介绍ADRF6655主要特性, 功能方框图, PLL和VCO方框图,以及850MHz, 900MHz, 1200MHz, 1300MHz, 1600MHz和2100MHz输出匹配网络,评估板电路图和评估板配置元件表.

The ADRF6655 is a high dynamic range active mixer with integrated PLL and VCO. The synthesizer uses a programmable integer-N/fractional-N PLL to generate a local oscillator input to the mixer. The PLL reference input is nominally 20 MHz. The reference input can be divided by or multiplied by and then applied to the PLL phase detector. The PLL can support input reference frequencies 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. The VCO output at 2 × fLO is then applied to a local oscillator (LO) divider as well as to a programmable PLL divider. The programmable divider is controlled by an Σ-Δ modulator (SDM). The modulus of the SDM can be programmed between 1 and 2047.
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