超宽带延时幅相控制多功能芯片的设计

针对航空航天和卫星通信等设备的需求,介绍了一款超宽带延时幅相控制多功能芯片。该芯片集成了数字和微波电路,有T/R 开关、5 位数控延时器(10 ps 步进TTD)、5位数控衰减器(1 dB 步进ATT)、2 个行波放大器、均衡器及数字电路。基于GaAs E/D PHEMT 工艺研制出了芯片实物,芯片尺寸为4.5 mm*5.0 mm*0.07 mm。采用微波在片测试系统对该幅相控制多功能芯片进行了实际测试,在3 ~ 17 GHz 频段内实现了10~310 ps 延时范围,1~31 dB 衰减范围。测试结果显示,发射/接收增益大于2 dB,发射1 dB 压缩输出功率P1 dB_Tx大于12 dBm,接收1 dB 压缩输出功率P1 dB_Rx大于10 dBm,全态输入输出驻波均小于1.7,+5 V 下工作电流130 mA,-5 V 下工作电流12 mA。衰减器全态RMS 精度小于1.4 dB,全态附加调相小于±8°。延时器全态RMS 精度小于3 ps,全态附加调幅小于±1 dB。

Design of Ultra-wideband True-Time Delay Multi-function Chip

Based on the demand for equipment such as aerospace and satellite communications, the ultra wideband true-time delay multi-function chip (MFC) is designed in this paper. Moreover, the digital and microwave circuits are integrated in the MFC, which contains T/ R SPDTs, a 5 bit digitally controlled true-time delay(TTD), a 5 bit digitally controlled attenuator(ATT) two TWT amplifiers,equilizer and digital circuit. Characterized with compact size of 4.5 mm * 5.0 mm * 0.07 mm, the MFC is fabricated on GaAs E/ D PHEMT technology. The test results on wafer show that the MFC provides 10~310 ps with an interval of 10 ps and 1~31 dB with an interval of 1 dB in the frequency range of 3~17 GHz. The test results show that the measured gain is more than 2 dB,and the 1 dB compressed output power P1dB_Tx is more than 12 dB in transmitting mode;while in receiving mode,the test gain is more than 2 dB,and the 1 dB compressed output power P1dB_Rx is more than 10 dB. The input and output VSWRs are better than 1.7 on the whole bandwidth for all states. The +5 V DC power consumption is better than 130 mA, and the -5 V DC power consumption is less than 12 mA. The root mean square (RMS) of ATT and phase variation is reduced to 1.4 dB and ±8°for all states. The root mean square (RMS) of TTD and insertion variation is reduced to 3 ps and ±1 dB for all states.