This paper presents the design and analysis of a millimeter-wave LNA-mixer, which adopts a low-noise single-to-differential conversion balun with low phase (gain) imbalance, using a common-source and a common-gate stage. Each stage employs a cascode transistor with inductors in the gate and source for improving noise, gain, and bandwidth performance. A new transformer-based network is proposed for broadband input matching. Also, a transformer network couples between transconductance and switching stage for independent biasing of two stages, which provides passive gain without extra power consumption and further noise reduction. To optimize the size of transistors and their current density, a new figure of merit is utilized which concurrently optimize noise performance, cut-off frequency, and transconductance efficiency. The input frequency range is 27.5–43.5 GHz with typical input signal power of – 40 dBm and a switching signal power of 0dBm, using 0.18 µm CMOS technology. The simulation result shows that typical conversion gain is 24–27 dB, DSB-NF is 5.33–9.1 dB, and third-order intercept point is − 7.83 dBm. The DC power consumption is 11.13 mW with a chip size of 0.45 mm².

本文介绍了一种毫米波LNA混频器的设计和分析，该混频器采用具有低相位（增益）不平衡的低噪声单到差分转换巴伦，并使用共源和共栅级。每个级均采用在栅极和源极均带有电感的共源共栅晶体管，以改善噪声，增益和带宽性能。提出了一种新的基于变压器的网络，用于宽带输入匹配。同样，一个变压器网络耦合在跨导和开关级之间，用于两个级的独立偏置，从而提供了无源增益，而没有额外的功耗和进一步的噪声降低。为了优化晶体管的尺寸及其电流密度，采用了新的品质因数，该品质因数同时优化了噪声性能，截止频率和跨导效率。使用0.18 µm CMOS技术，输入频率范围为27.5–43.5 GHz，典型输入信号功率为– 40 dBm，开关信号功率为0dBm。仿真结果表明，典型的转换增益为24–27 dB，DSB-NF为5.33–9.1 dB，三阶交调点为− 7.83 dBm。直流功耗为11.13 mW，芯片尺寸为0.45 mm²。