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Voltammetric Techniques: Pulse Voltammetry01:17

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Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
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Updated: Nov 10, 2025

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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A mV-level real-time peak-voltage detection circuit based on differential structure.

Qing Wu1, Shiliang Wang1, Congwei Liao1

  • 1School of Physics and Electronics, Central South University, Changsha 410083, China.

The Review of Scientific Instruments
|April 6, 2021
PubMed
Summary

This study introduces an improved peak-voltage detection circuit using a differential comparison structure and a two-channel parallel sample and hold (S/H) circuit. This design minimizes detection errors and noise for accurate signal analysis.

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Analog Circuit Design

Background:

  • Accurate peak-voltage detection is crucial for signal synchronization and analysis.
  • Traditional peak detectors often suffer from reset signal requirements and errors due to noise and leakage currents.

Purpose of the Study:

  • To propose a novel peak-voltage detection circuit free from reset signals.
  • To enhance detection accuracy by minimizing errors caused by op-amp offset voltage, circuit noise, and leakage current.

Main Methods:

  • A differential comparison structure for signal synchronization.
  • A two-channel parallel sample and hold (S/H) circuit.
  • Correlated double sampling (CDS) and ping-pong techniques for simultaneous signal and offset voltage sampling.

Main Results:

  • The proposed circuit eliminates the need for reset signals for sampling capacitors.
  • Achieved a detection error of 30 µV for a 10 mV, 20 kHz signal.
  • Equivalent output noise was measured at 71 nV/√Hz.

Conclusions:

  • The novel peak-voltage detection circuit effectively reduces errors from offset voltage, noise, and leakage.
  • The combination of parallel S/H, CDS, and ping-pong techniques offers superior performance in peak detection applications.