Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Small-Signal Analysis of BJT Amplifiers

Small-Signal Analysis of BJT Amplifiers

Small signal analysis is a fundamental approach used in electronics to understand how a Bipolar Junction Transistor (BJT) amplifier processes signals. In the active region, the BJT is designed for linear amplification. The transistor's behavior under these conditions is governed by its instantaneous base-emitter voltage VBE, a sum of the DC bias VBE, and a small AC signal VBE, resulting in the collector current iC. Here, the collector current has a DC component and an AC component.

Small-Signal Analysis of MOSFET Amplifiers

Small-Signal Analysis of MOSFET Amplifiers

In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...

BJT Amplifiers

BJT Amplifiers

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.
In BJT amplifier configurations, particularly in common-emitter setups, the transistor's role extends...

Cascaded Op Amps

Cascaded Op Amps

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.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...

MOSFET Amplifiers

MOSFET Amplifiers

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...

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

An <i>in vitro</i> study evaluating the canal centering ability, canal transportation, and remaining dentin thickness of three retreatment systems.

Journal of conservative dentistry and endodontics·2026

Same author

Search for Axion Dark Matter from 1.1 to 1.3 GHz with ADMX.

Physical review letters·2025

Same author

Effect of different root canal drying techniques on the push-out bond strength of ceraseal sealer - An <i>in vitro</i> study.

Journal of conservative dentistry and endodontics·2025

Same author

ADMX Axion Dark Matter Bounds around 3.3 μeV with Dine-Fischler-Srednicki-Zhitnitsky Discovery Ability.

Physical review letters·2025

Same author

Benchmarking the Readout of a Superconducting Qubit for Repeated Measurements.

Physical review letters·2025

Same author

Comparative evaluation of root canal disinfection efficacy of three different endodontic irrigants using EndoVac: An <i>in vitro</i> bioluminescence-assisted study.

Journal of conservative dentistry and endodontics·2025

Search research articles

Related Experiment Video

Updated: Jun 18, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Invited review article: The Josephson bifurcation amplifier.

R Vijay¹, M H Devoret, I Siddiqi

¹Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA.

The Review of Scientific Instruments

|December 2, 2009

Summary

The Josephson bifurcation amplifier (JBA) uses a nonlinear oscillator to amplify weak signals. It offers sensitive digital threshold amplification and analog amplification for superconducting qubit readout and microwave magnetometry.

More Related Videos

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Related Experiment Videos

Last Updated: Jun 18, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Area of Science:

Quantum electronics
Superconducting circuits
Nonlinear dynamics

Background:

The Josephson bifurcation amplifier (JBA) is a sensitive amplifier based on a nonlinear oscillator.
The oscillator utilizes a Josephson junction, a key component in superconducting quantum devices.
Understanding the JBA's nonlinear dynamics is crucial for its application in quantum technologies.

Purpose of the Study:

To review the theory, fabrication, and implementation of the Josephson bifurcation amplifier (JBA).
To explain the JBA's amplification mechanism based on a Josephson junction's nonlinear behavior.
To present experimental characterization and applications of the JBA.

Main Methods:

Theoretical analysis of a nonlinear oscillator with a Josephson junction.
Biasing the Josephson junction with microwave current to access nonlinear and bistable regimes.
Experimental characterization of amplifier performance in digital and analog modes.

Main Results:

A Josephson junction's dispersive shift in plasma frequency enables amplification.
The oscillator exhibits bistability, allowing for sensitive digital threshold amplification.
Analog amplification is achievable near the bistable regime.

Conclusions:

The JBA provides a sensitive platform for both digital and analog signal amplification.
Applications include superconducting qubit readout and dispersive microwave magnetometry.
The JBA's performance is linked to the nonlinear dynamics of the Josephson junction.