Linear LTC5594300MHz－9GHz I－Q解调器解决方案

Linear公司的LTC5594是用于300MHz-9GHz频段的直接转换正交解调器,镜像抑制优于60dB,5.8GHz时总OIP3为37dBm,OIP2为58dBm,可调整到65dBm,最达功率转换增益为9.2dB,工作温度–40℃到105℃,主要用在5G基站前传(Fronthaul)和回传(Backhaul)接收器,军用和卫星接收器,点对点宽带无线点,高线性直接转换I/Q SDR,测试仪表和DPD接收器.本文介绍了LTC5594主要特性,框图和测试电路图,以及演示板DC2645A主要特性,硬件建立图和电路图.
DC2645A - LTC5594 l 300MHz to 9GHz I/Q Demodulator with Wideband IF Amplifier The LTC®5594 is a direct conversion quadrature demodulatoroptimized for high linearity zero-IF and low-IF receiverapplications in the 300MHz to 9GHz frequency range.
The very wide IF bandwidth of more than 1GHz makesthe LTC5594 particularly suited for demodulation of verywideband signals, especially in 5G fronthaul/backhaulreceiver applications. The outstanding dynamic range ofthe LTC5594 makes the device suitable for demandinginfrastructure direct conversion applications. Proprietarytechnology inside the LTC5594 provides the capabilityto optimize OIP2 to 65dBm, and achieve image rejectionbetter than 60dB. The DC offset control function allowsnulling of the DC offset at the A/D converter input, therebyoptimizing the dynamic range of true zero-IF receivers thatuse DC-coupled IF signal paths. The wideband RF and LOinput ports make it possible to cover all the major wirelessinfrastructure frequency bands using a single device. TheIF outputs of the LTC5594 are designed to interface directlywith most common A/D converter input interfaces. Thehigh OIP3 and high conversion gain of the device eliminatethe need for additional amplifiers in the IF signal path.
LTC5594主要特性:

True Zero IF Demodulation
Wideband Input Matched from 500MHz to 9GHz
Wide IF Bandwidth: DC to 1GHz (1dB Flatness)
37dB Image Rejection, Adjustable to 60dB
High Total OIP3: 37dBm at 5.8GHz
58dBm OIP2 at 5.8GHz, Adjustable to 65dBm
Max Power Conversion Gain: 9.2dB at 5.8GHz
Single-Ended ...