论文标题

使用电感的绝热量子 - 浮动 - parametron逻辑中激发线的阻抗设计

Impedance Design of Excitation Lines in Adiabatic Quantum-Flux-Parametron Logic Using InductEx

论文作者

Takeuchi, Naoki, Suzuki, Hideo, Fourie, Coenrad J., Yoshikawa, Nobuyuki

论文摘要

绝热的量子 - 频率 - 帕拉姆元素(AQFP)是一种使用绝热切换的节能超导体逻辑家族。 AQFP门由AC激发电流驱动和时钟;因此,要在高时钟频率下操作AQFP电路,需要仔细设计激发线的特征阻抗(尤其是在AQFP门上方),以便微波激发电流可以在整个电路中不反射而传播。在本研究中,我们使用电感来设计激发线的特性阻抗,这是超导体设备的三维参数提取器。我们使用电感来调整激发线的宽度,以使特征阻抗甚至在AQFP门上方也变为50Ω。然后,我们制作测试电路以验证激发线的阻抗。我们使用时域反射测量法(TDR)测量阻抗。我们还测量了激发线的S参数,以研究最大可用时钟频率。我们的实验结果表明,激发线的特征阻抗甚至在AQFP门上方的设计值都很好,并且大型AQFP电路的时钟频率超过5 GHz。

The adiabatic quantum-flux-parametron (AQFP) is an energy-efficient superconductor logic family that utilizes adiabatic switching. AQFP gates are powered and clocked by ac excitation current; thus, to operate AQFP circuits at high clock frequencies, it is required to carefully design the characteristic impedance of excitation lines (especially, above AQFP gates) so that microwave excitation current can propagate without reflections in the entire circuit. In the present study, we design the characteristic impedance of the excitation line using InductEx, which is a three-dimensional parameter extractor for superconductor devices. We adjust the width of an excitation line using InductEx such that the characteristic impedance becomes 50 Ω even above an AQFP gate. Then, we fabricate test circuits to verify the impedance of the excitation line. We measure the impedance using the time domain reflectometry (TDR). We also measure the S parameters of the excitation line to investigate the maximum available clock frequency. Our experimental results indicate that the characteristic impedance of the excitation line agrees well with the design value even above AQFP gates, and that clock frequencies beyond 5 GHz are available in large-scale AQFP circuits.

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