55纳米BiCMOS发射机中用于宽带I/Q LO产生的70 - 90 ghz自调谐多相滤波器

Farshad Piri, Elham Rahimi, M. Bassi, F. Svelto, A. Mazzanti
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引用次数: 0

摘要

提出了一种嵌入在直接转换e波段发射机(TX)中的低功耗正交本振(LO)产生方案。单级多相滤波器在环路中闭合,并通过正交相位检测器连续调谐,以保持精确的I/Q信号,不受LO频率和分量变化的影响,从而使解决方案具有宽带和鲁棒性,可抵抗工艺、电源和温度变化。采用全平衡模拟乘法器实现的模拟鉴相器是实现高精度的关键。为了避免系统相位误差,并在高工作频率的情况下保持较高的检测器增益,提出了仔细的电路分析和简单的设计方案。TX采用BiCMOS 55纳米技术实现,在80 GHz时提供20.5 dBm的最大线性输出功率,功率效率为14%。LO缓冲器从2.3 v电源消耗115 mW,而LO校准电路只需要16 mW,并允许在70-90 GHz范围内保持40 dB或更好的显着图像抑制比。
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70–90-GHz Self-Tuned Polyphase Filter for Wideband I/Q LO Generation in a 55-nm BiCMOS Transmitter
A low-power quadrature local oscillator (LO) generation scheme embedded in a direct-conversion E-band transmitter (TX) is presented. A single-stage polyphase filter is closed in a loop and continuously tuned by means of a quadrature phase detector to maintain precise I/Q signals independently from LO frequency and component variations, thus making the solution wideband and robust against process, supply, and temperature variations. The analog phase detector, realized with fully balanced analog multipliers, is critical to reach high accuracy. Careful circuit analysis and simple design solutions are proposed to avoid systematic phase errors and to maintain high detector gain despite the high operating frequency. The TX, realized in BiCMOS 55-nm technology, delivers a maximum linear output power of 20.5 dBm at 80 GHz with 14% power efficiency. The LO buffers consumes 115 mW from 2.3-V supply while the LO calibration circuits need 16 mW only and allows to maintain a remarkable image rejection ratio of 40 dB or better over 70–90 GHz.
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