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MOSFET Amplifiers01:17

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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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BJT Amplifiers01:14

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Bipolar Junction Transistors (BJTs) are pivotal components in amplifier circuits, functioning as voltage-controlled current sources in their active region. This characteristic allows them to efficiently control the collector current through variations in the base-emitter voltage. Essentially, BJTs amplify power due to their ability to take a weak input signal and output a much stronger signal.
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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
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Small-Signal Analysis of MOSFET Amplifiers01:23

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Characterizing cryogenic amplifiers with a matched temperature-variable noise source.

Slawomir Simbierowicz1, Visa Vesterinen2, Joshua Milem1

  • 1Bluefors Oy, Arinatie 10, 00370 Helsinki, Finland.

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|April 6, 2021
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Summary
This summary is machine-generated.

We developed a new cryogenic microwave noise source for precise amplifier testing. This device achieves ultra-low system noise temperatures, crucial for quantum computing applications.

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Area of Science:

  • Cryogenic Engineering
  • Microwave Engineering
  • Quantum Computing

Background:

  • Accurate characterization of sensitive amplifiers is critical for quantum technologies.
  • Existing cryogenic noise sources may introduce unwanted heating or lack tunability.
  • Solid-state qubit readout lines require precise noise measurements.

Purpose of the Study:

  • To present a novel cryogenic microwave noise source.
  • To demonstrate its capability for ultra-low noise measurements.
  • To validate its application in characterizing amplifier cascades for qubit readout.

Main Methods:

  • Designed and implemented a 50 Ω cryogenic microwave noise source.
  • Integrated the source into a coaxial line within a cryostat.
  • Utilized Y-factor measurements to assess amplifier cascade performance.
  • Varied bath temperature from 0.1 K to 5 K.

Main Results:

  • Achieved continuously variable bath temperatures (0.1 K - 5 K) without sample space heating.
  • Observed system noise temperatures as low as 680-200 +20 mK at 5.7 GHz.
  • Demonstrated noise performance equivalent to 1.5-0.7 +0.1 excess photons.

Conclusions:

  • The developed cryogenic noise source enables precise amplifier characterization at ultra-low temperatures.
  • It is suitable for validating readout lines in quantum computing systems.
  • Offers a tunable and low-back-action solution for cryogenic noise injection.