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Related Concept Videos

Instrumentation Amplifier01:25

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...
Sum and Difference OpAmps01:22

Sum and Difference OpAmps

Operational amplifiers (op-amps) are versatile devices that extend beyond amplification. In this context, two specific op-amp configurations are explored: the summing and difference amplifiers.
A summing amplifier, or an adder, utilizes an op-amp to merge multiple input signals into a single output signal. When audio signals are introduced into its input channels, the input resistors initiate currents that traverse feedback resistors, resulting in an output voltage. Applying Kirchhoff's current...
Inverting and Non-inverting OpAmps01:20

Inverting and Non-inverting OpAmps

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Operational Amplifiers01:17

Operational Amplifiers

The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
Characteristics of Practical Op Amps01:16

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Integrator and Differentiator01:13

Integrator and Differentiator

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Differential automatic zero-adjusting amplifier.

B Broersen1, F Van Krevelen, J T van Heusden

  • 1Department of Animal Physiology, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands.

The Review of Scientific Instruments
|July 1, 1979
PubMed
Summary
This summary is machine-generated.

A novel method creates a low-voltage-drift differential DC amplifier with automatic zero adjustment using a unique two-step process. This design offers high input impedance and can be easily adapted for existing amplifiers, achieving minimal drift.

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Area of Science:

  • Electrical Engineering
  • Analog Circuit Design

Background:

  • Differential DC amplifiers often suffer from voltage drift, limiting their precision.
  • Automatic zero adjustment is crucial for maintaining accuracy in sensitive electronic measurements.

Purpose of the Study:

  • To present a method for constructing a low-voltage-drift differential DC amplifier.
  • To achieve automatic zero adjustment and high input impedance.
  • To demonstrate the adaptability of the design for existing amplifiers.

Main Methods:

  • An asymmetric two-step process between the input signal and ground is employed.
  • Bandwidth extension is possible using a secondary amplifier during ground-sampling.
  • The amplifier is constructed using standard electronic components.

Main Results:

  • A low-voltage-drift amplifier with a bandwidth of 10 kHz was successfully built.
  • A practical example demonstrated a drift of 0.2 microV/°C.
  • Existing amplifiers can be retrofitted with the automatic zero-adjusting input stage.

Conclusions:

  • The described method provides an effective solution for low-voltage-drift DC amplifiers.
  • The design is versatile, cost-effective, and suitable for both new builds and upgrades.
  • This technique significantly enhances the stability and precision of differential amplifiers.