Abstract
We designed, implemented, and characterized differential amplifiers for cryogenic temperatures based on Si bipolar junction transistor technology. The amplifiers show high gain values of more than 60 dB at 300, 77, and 48 K. The minimum voltage noise spectral density was achieved at 77 K and corresponded to 0.33 nV/Hz0.5 with a flicker noise of 20 Hz. The maximum voltage gain was 70 dB at 77 K for a frequency range from DC to 17 kHz. We experimentally show that the parallel differential circuit design allows for a reduction of the voltage noise from 0.55 to 0.33 nV/Hz0.5 at 77 K.
Highlights
Superconducting detectors are the most sensitive devices in the electromagnetic field and find wide application in radioastronomy and quantum electronics
Investigations of noise sources in low-temperature tunnel Josephson junctions are still ongoing for high-precision calibration of superconductor technology and for finding new noise sources in Josephson junctions, which lead to high decoherence in superconducting systems [2,3]
We have demonstrated differential cryogenic low-frequency low-noise bipolar junction transistor amplifiers
Summary
Superconducting detectors are the most sensitive devices in the electromagnetic field and find wide application in radioastronomy and quantum electronics. The most important part in a measurement readout is a low-noise amplifier. The modern low-temperature low-noise cryogenic amplifiers are widely used for superconducting circuit readout at a temperature of 4 K [4,5,6,7,8,9,10].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
