论文标题
超导型逻辑界面的紧凑高频放大器
A Compact High Frequency Voltage Amplifier for Superconductor-Semiconductor Logic Interface
论文作者
论文摘要
低温冷却的单升量子（SFQ）电路的许多优势表明，必须放大高速和低电压输出信号并与标准电子设备连接。与室温电子设备接口需要最先进的低噪声和宽频带放大器。一种解决方案是将前置放大器放置在低温阶段，该阶段需要特定的半导体设计和制造。但是，一种更可行的节能方法是将脉冲逻辑电路输出阶段与芯片上超导体前置放大器整合在一起。我们设计，制造和测试了与SFQ电路输出阶段集成的片上紧凑型电压乘数，以增加SFQ脉冲的电压振幅。该电路的设计具有与逻辑电路相同的技术，因此其噪声水平较低，与CMOS放大器相比，它的频率更高，并且由于其量化的性质，因此没有添加的噪声。制造的电路的紧凑型尺寸为160 UM x 320UM，在模拟中，以高达〜25 GHz的频率下的600 UV输出电压可提供约10 dB的增益。通过堆叠更多的水平，如模拟所示，可以在电路级别上达到20 dB的增益。此外，对超导电压放大器的增益进行了量化和编程。
The many advantages of cryogenically-cooled Single-Flux Quantum (SFQ) circuits imply that the high speed and low voltage output signals must be amplified and interfaced with standard electronics. State-of-the-art low-noise and wide-band amplifiers are required to interface with room temperature electronics. One solution is to place preamplifiers at the cryogenic stage, which requires specific semiconductor design and fabrication. However, a more viable and energy-efficient approach is to integrate the pulsed logic circuit output stages with on-chip superconductor preamplifiers. We designed, fabricated, and tested an on-chip compact voltage multiplier integrated with the output stage of SFQ circuits to increase the voltage amplitude of SFQ pulses. The circuit is designed with the same technology as the logic circuit hence its noise level is lower, and it works at higher frequencies compared to CMOS amplifiers and due to quantized nature of it there is no added noise. The fabricated circuit has a compact size of 160 um x 320um and provides about 10 dB gain with measured 600 uV output voltage at frequencies up to ~25 GHz in simulations. By stacking more levels, over 20 dB gain at circuit level is achievable as shown in simulations. Moreover the gain of the superconductor voltage amplifier is quantized and programmable.
