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Instruments and Experimental Techniques

A wideband radio-frequency amplifier for investigations at temperatures from 300 to 0.1 K

A. M. Korolev, V. M. Shulga, Oleg G. Turutanov, V. I. Shnyrkov

Published Jul 1, 2015• 6 citations
Publisher

Abstract

A wideband cooled measuring amplifier, which solves a wide class of search problems in the area of cryoelectronics at frequencies of 10–100 MHz, is described. The amplifier differs from the existing prototypes in the reduced power consumption and influence on the source (suppressed back action effect), serviceability in a temperature interval of 0.1–300 K, and high regulated gain (up to 40 dB). The power consumed (dissipated) by the first ultralow-temperature stage, is ∼1 μW. The circuitry components are commercially available.

DOI
10.1134/s0020441215030227

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A wideband cooled measuring amplifier, which solves a wide class of search problems in the area of cryoelectronics at frequencies of 10–100 MHz, is described. The amplifier differs from the existing prototypes in the reduced power consumption and influence on the source (suppressed back action effect), serviceability in a temperature interval of 0.1–300 K, and high regulated gain (up to 40 dB). The power consumed (dissipated) by the first ultralow-temperature stage, is ∼1 μW. The circuitry components are commercially available.
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A low-noise cryogenic amplifier for the measurement of weak microwave signals at sub-Kelvin temperatures is constructed. The amplifier has five stages based on SiGe bipolar heterostructure transistors and has a gain factor of 35 dB in the frequency band from 100 MHz to 4 GHz at an operating temperature of 800 mK. The parameters of a superconducting quantum bit measured with this amplifier in the ultralow-power mode are presented as an application example. The amplitude–frequency response of the “supercon-ducting qubit–coplanar cavity” structure is demonstrated. The ground state of the qubit is characterized in the quasi-dispersive measurement mode.
A design of low-noise wide band (0.05...1 GHz) cooled videoamplifier for prospective terahertz-range single-photon superconducting nanowire detectors is reported. The amplifier differs from existing prototypes by reduced consumption power (4mW) and ability of direct integration with the primary superconducting transducer to prevent false triggering caused by reflected waves in the detector-amplifier transmission line. The absolute stability, low noise factor and back action make the amplifier suitable also for other radio astronomy and physical applications.
We demonstrate a radio-frequency parametric amplifier that exploits the gate-tunable quantum capacitance of an ultra high mobility two dimensional electron gas (2DEG) in a GaAs heterostructure at cryogenic temperatures. The prototype narrowband amplifier exhibits a gain greater than 20 dB up to an input power of - 66 dBm (1 dB compression), and a noise temperature TN of 1.3 K at 370 MHz. In contrast to superconducting amplifiers, the quantum capacitance parametric amplifier (QCPA) is operable at tesla-scale magnetic fields and temperatures ranging from milli kelvin to a few kelvin. These attributes, together with its low power (microwatt) operation when compared to conventional transistor amplifiers, suggest the QCPA may find utility in enabling on-chip integrated readout circuits for semiconductor qubits or in the context of space transceivers and radio astronomy instruments.