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 complementary metal-oxide semi-conductor amplifiers and due to quantized nature of it there is no added noise. The fabricated circuit has a compact size of 160 m 320 m and provides about 10 dB gain with measured 600 V 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.

低温冷却的单通量量子（SFQ）电路的许多优点意味着必须放大高速和低压输出信号并与标准电子设备接口。需要最新的低噪声和宽带放大器来与室温电子设备接口。一种解决方案是将前置放大器置于低温阶段，这需要特定的半导体设计和制造。但是，一种更可行，更节能的方法是将脉冲逻辑电路输出级与片上超导体前置放大器集成在一起。我们设计，制造和测试了集成了SFQ电路输出级的片上紧凑型电压倍增器，以增加SFQ脉冲的电压幅度。该电路采用与逻辑电路相同的技术设计，因此其噪声水平较低，与互补金属氧化物半导体放大器相比，它在更高的频率下工作，并且由于其量化的特性，因此不会增加噪声。制作好的电路的紧凑尺寸为160m 320 m并在测量600时提供约10 dB的增益 在仿真中，V输出电压的频率高达〜25 GHz。通过堆叠更多的电平，如仿真所示，可以在电路电平上获得超过20 dB的增益。此外，超导体电压放大器的增益可以量化和编程。