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Cut-off Frequency of BJT

Cut-off Frequency of BJT

Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...

Instrumentation Amplifier

Instrumentation Amplifier

An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...

Mass Analyzers: Common Types

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...

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...

Configurations of BJT

Configurations of BJT

Bipolar Junction Transistors (BJTs) are categorized into various types based on their configurations, each with distinct characteristics and applications. The configurations are primarily differentiated by which terminal—base, emitter, or collector—is common to both the input and output circuits.
The common base configuration is noted for its high voltage gain, positioning it as an ideal choice for single-stage amplifier circuits, such as microphone pre-amplifiers. A notable characteristic of...

Transducer Mechanism: Nuclear Receptors

Transducer Mechanism: Nuclear Receptors

Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:

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Related Experiment Video

Updated: Jul 6, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

Published on: February 1, 2016

A low-noise current-sensitive amplifier-discriminator system for beta particle counting.

J P Sephton¹, L C Johansson, J M Williams

¹National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK. john.sephton@npl.co.uk

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|March 18, 2008

Summary

National Physical Laboratory (NPL) created a new low-noise amplifier for detecting low-energy electrons and X-rays. This improved beta amplifier enhances particle detection efficiency and offers better counting performance for radionuclides.

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Last Updated: Jul 6, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

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Published on: February 1, 2016

Additive Manufacturing-Enabled Low-Cost Particle Detector

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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Preparing an Isotopically Pure ²²⁹Th Ion Beam for Studies of ^229mTh

Published on: May 3, 2019

Area of Science:

Nuclear Physics
Instrumentation Science

Background:

Radionuclides emitting low-energy electrons and X-rays require specialized detection systems.
Existing amplifiers may have limitations in signal-to-noise ratio and detection efficiency.

Purpose of the Study:

To develop and present a novel low-noise current amplifier/discriminator system.
To enhance the detection efficiency and performance for low-energy beta and X-ray emitting radionuclides.

Main Methods:

Utilized the low-noise Amptek A-250 operational amplifier.
Configured the system for optimal signal-to-noise ratio.
Tested the amplifier using electron-capture decaying radionuclides, including (54)Mn and (65)Zn.

Main Results:

The new beta amplifier demonstrates higher particle detection efficiency compared to previous designs.
Achieved significantly longer counting plateaux with reduced gradients.
Optimized signal-to-noise ratio for improved measurement accuracy.

Conclusions:

The NPL-developed low-noise amplifier offers superior performance for detecting low-energy radionuclides.
The enhanced system provides increased particle detection efficiency and improved counting stability.
This advancement benefits applications requiring precise measurement of specific radionuclides.