A two-way K/Ka-band series-Doherty PA(SDPA)with a distributed impedance inverting network(IIN)for millimeter wave applications is presented in this article.The proposed distributed IIN contributes to achieve wideband ...A two-way K/Ka-band series-Doherty PA(SDPA)with a distributed impedance inverting network(IIN)for millimeter wave applications is presented in this article.The proposed distributed IIN contributes to achieve wideband linear and power back-off(PBO)efficiency enhancement.Implemented in 65 nm bulk CMOS technology,this work realizes a measured 3 dB band-width of 15.5 GHz with 21.2 dB peak small-signal gain at 34.2 GHz.Under 1-V power supply,it achieves OP1dB over 13.4 dBm and Psat over 16 dBm between 21 to 30 GHz.The measured maximum Psat,OP1dB,peak/OP1dB/6dBPBO PAE results are 17.5,14.7 dBm,and 28.2%/23.2%/13.2%.Without digital pre-distortion(DPD)and equalization,EVMs are lower than-25.2 dB for 200 MHz 64-QAM signals.Besides,this work achieves-33.35,-23.52,and-20 dB EVMs for 100 MHz 256-QAM,600 MHz 64-QAM and 2 GHz 16-QAM signals at 27 GHz without DPD and equalization.展开更多
锁相放大器是一种用于解调近场信号的仪器,由于前端模拟链路本身的硬件特性会对待测信号的结果产生影响。本文提出了一种数字锁相启动上位机时初始化校准的方法,目的在于保证前端模拟链路处于最佳的工作状态。矫正电压偏置;最大限度补...锁相放大器是一种用于解调近场信号的仪器,由于前端模拟链路本身的硬件特性会对待测信号的结果产生影响。本文提出了一种数字锁相启动上位机时初始化校准的方法,目的在于保证前端模拟链路处于最佳的工作状态。矫正电压偏置;最大限度补偿模拟链路引入的增益误差以及DDS输出信号与ADC采样过程中不同步引入的相位偏移。测试结果表明,该方案可实现对上述误差的补偿,显著提高了锁相放大器解调近场信号时的精确性和稳定性。The lock-in amplifier is an instrument used to demodulate near-field signals. Due to the hardware characteristics of the frontend analog circuitry, it can affect the results of the signal under test. This paper proposes a method for initialization calibration when starting up the digital lock-in amplifier’s host computer, aiming to ensure that the frontend analog circuitry operates in an optimal state. It calibrates the voltage offset, maximizes the compensation for gain errors introduced by the analog circuitry, and phase shifts introduced by the asynchrony between the DDS output signal and the ADC sampling process. Test results show that this scheme can compensate for the aforementioned errors, significantly improving the accuracy and stability of the lock-in amplifier when demodulating near-field signals.展开更多
基金supported in part by the National Key Research and Development Program of China under Grant 2020YFB1807300the Beijing Advanced Innovation Center for Integrated Circuits。
文摘A two-way K/Ka-band series-Doherty PA(SDPA)with a distributed impedance inverting network(IIN)for millimeter wave applications is presented in this article.The proposed distributed IIN contributes to achieve wideband linear and power back-off(PBO)efficiency enhancement.Implemented in 65 nm bulk CMOS technology,this work realizes a measured 3 dB band-width of 15.5 GHz with 21.2 dB peak small-signal gain at 34.2 GHz.Under 1-V power supply,it achieves OP1dB over 13.4 dBm and Psat over 16 dBm between 21 to 30 GHz.The measured maximum Psat,OP1dB,peak/OP1dB/6dBPBO PAE results are 17.5,14.7 dBm,and 28.2%/23.2%/13.2%.Without digital pre-distortion(DPD)and equalization,EVMs are lower than-25.2 dB for 200 MHz 64-QAM signals.Besides,this work achieves-33.35,-23.52,and-20 dB EVMs for 100 MHz 256-QAM,600 MHz 64-QAM and 2 GHz 16-QAM signals at 27 GHz without DPD and equalization.
文摘锁相放大器是一种用于解调近场信号的仪器,由于前端模拟链路本身的硬件特性会对待测信号的结果产生影响。本文提出了一种数字锁相启动上位机时初始化校准的方法,目的在于保证前端模拟链路处于最佳的工作状态。矫正电压偏置;最大限度补偿模拟链路引入的增益误差以及DDS输出信号与ADC采样过程中不同步引入的相位偏移。测试结果表明,该方案可实现对上述误差的补偿,显著提高了锁相放大器解调近场信号时的精确性和稳定性。The lock-in amplifier is an instrument used to demodulate near-field signals. Due to the hardware characteristics of the frontend analog circuitry, it can affect the results of the signal under test. This paper proposes a method for initialization calibration when starting up the digital lock-in amplifier’s host computer, aiming to ensure that the frontend analog circuitry operates in an optimal state. It calibrates the voltage offset, maximizes the compensation for gain errors introduced by the analog circuitry, and phase shifts introduced by the asynchrony between the DDS output signal and the ADC sampling process. Test results show that this scheme can compensate for the aforementioned errors, significantly improving the accuracy and stability of the lock-in amplifier when demodulating near-field signals.
