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为满足数字相控阵雷达对收发通道关键元器件国产化的需求,基于国内工艺线研制了一款数字变频芯片。该芯片包含双通道的数字下变频(DDC)与数字上变频(DUC)电路,通过LVDS接口与SPI接口实现与上位机的数据交换。该芯片的抽取率/插值率、数字本振频率、相位偏置、通道幅度补偿系数、滤波器系数等参数均可配置,能够适应不同工作场景。通过修改数字变频器中数控振荡器(NCO)的相位偏置,可以实现对收发信号的移相操作,使与本芯片配对使用的TR组件可以取消移相器。通过门控时钟等低功耗设计大大降低了该芯片的平均功耗,减轻了供电与散热压力。经过芯片测试,该芯片的DDC与DUC的通带纹波<0.05 d B,阻带衰减>70 d Bc,平均功耗<1.2 W,其功能与性能满足系统应用,为相控阵雷达收发通道的小型化与国产化提供了新的解决方案。
In order to meet the digital phased array radar transceiver channel localization of key components needs, based on domestic technology developed a digital frequency conversion chip. The chip contains dual digital down conversion (DDC) and digital up conversion (DUC) circuits, through the LVDS interface and SPI interface to achieve with the host computer data exchange. The chip’s extraction rate / interpolation rate, digital local oscillator frequency, phase offset, channel amplitude compensation coefficient, filter coefficient and other parameters can be configured to adapt to different work scenarios. By modifying the phase offset of the digital controlled oscillator (NCO) in the digital frequency converter, it is possible to realize the phase-shifting operation on the transmitted and received signals so that the TR component paired with this chip can cancel the phase shifter. Through the gated clock and other low-power design greatly reduces the average power consumption of the chip, reducing the pressure on the power supply and cooling. After the chip test, the chip DDC and DUC pass-band ripple <0.05 d B, stop band attenuation> 70 d Bc, the average power consumption <1.2 W, its function and performance to meet the system applications for the phased array radar transceiver channel The miniaturization and localization provided a new solution.