研究目的
To design a low-power, inductorless wideband cryogenic amplifier for superconducting nanowire single photon detectors to achieve high gain, wide bandwidth, and small chip area.
研究成果
The proposed inductorless cryogenic amplifier achieves a gain of 23 dB with a 3-dB bandwidth of 3.4 GHz at 4.2 K, consuming only 4 mW power and occupying a small chip area of 0.075 mm2. It demonstrates good input and output match and high stability, advancing the state-of-the-art in cryogenic amplifiers for SNSPD applications. Future work could focus on integrated biasing circuits and noise measurement.
研究不足
The amplifier noise performance was not measured at cryogenic temperatures due to lack of equipment. The low cut-off frequency is limited by capacitor values, which decrease at cryogenic temperatures, affecting bandwidth. The design relies on adjustable biasing, which may require manual tuning for optimal performance across temperatures.
1：Experimental Design and Method Selection:
A modified Cherry-Hooper amplifier topology was used to achieve wide bandwidth, low power consumption, and small chip area. The design includes a transconductance stage and a transimpedance stage with shunt feedback to reduce impedances and increase bandwidth without inductors.
2：Sample Selection and Data Sources:
The amplifier was fabricated using a
3：13-μm SiGe BiCMOS process. Measurements were conducted at room temperature (300 K) and cryogenic temperature (2 K) using a liquid helium dewar. List of Experimental Equipment and Materials:
Equipment includes Agilent N5247A vector network analyzer, signal generator, oscilloscope, voltage source, temperature monitor, and PCB with SMA connectors and X7R ceramic capacitors. Materials include SiGe HBT transistors, resistors, capacitors, and the fabricated chip.
4：Experimental Procedures and Operational Workflow:
The chip was bonded on a PCB, and S-parameters were measured using the network analyzer. Transient responses were recorded with input signals at specific frequencies. Biasing currents and voltages were adjusted to optimize performance at different temperatures.
5：Data Analysis Methods:
S-parameters were analyzed for gain, bandwidth, and return loss. Transient responses were used to verify gain and signal fidelity. Figures of merit (FOM1 and FOM2) were calculated to compare with other cryogenic amplifiers.
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