面向太赫兹辐射计应用的宽带接收机芯片

A Broadband Receiver MMIC for Tera-Hertz Radiometer Application

设计一款工作在W波段的辐射计SOC芯片。该芯片采用商用0.1μm栅长的GaAs pHEMT工艺;内部集成低噪声放大器,IQ输出的零中频电阻混频器以及6倍频本振链。测试结果显示,该芯片工作频率为85~110 GHz,中频带宽大于10 GHz,本振需求低于16 GHz&6 dBm;工作频带内整个接收机电路的变频增益大于7 dB,特别在98~105 GHz频带内平坦度优于±0.5 dB。此外,该芯片实现了优于35 dBc的镜频抑制,极大降低了接收电路前级滤波器的需求。

An integrated W-Band radiometer SOC MMIC is designed with commercial 0.1 μm GaAs pHEMT technology.The circuit utilizes a low noise amplifier to drive a zero-IF IQ resistance mixer where the LO is driven by an ×6 multiplier chain.The test results show that the MMIC can operate from 85 to 110 GHz and the IF bandwidth is more than 10 GHz,the local oscillator requirement is less than 16 GHz & 6 dBm,the conversion gain of the whole receiver MMIC is greater than 7 dB,and the flatness in 98~105 GHz band is better than ±0.5 dB.In addition,the MMIC can provide more than 35 dBc image rejection across the frequency band and reduce significantly the need for filtering of the unwanted sideband.