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Design Example01:23

Design Example

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
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Design method for VDCC-based analog comb filter for power line interference cancellation.

Chandan Kumar Choubey1, Sumit Kumar1, Sanjeev Kumar Pippal2

  • 1Symbiosis Institute of Technology, Pune Campus, Symbiosis International (Deemed University), Pune, India.

Methodsx
|March 6, 2024
PubMed
Summary
This summary is machine-generated.

This study presents an analog comb filter using voltage-dependent current conveyors (VDCCs) to suppress power-line interference. The novel design allows independent control of filter parameters and uses fewer components for practical applications.

Keywords:
Biomedical signalsComb filterMethodology to design VDCC-based comb filterNotch filterPLI

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Area of Science:

  • Electrical Engineering
  • Analog Signal Processing
  • Filter Design

Background:

  • Power-line interference (e.g., 50 Hz and its harmonics) significantly degrades signal quality in electronic systems.
  • Existing notch filters often lack independent parameter control and require numerous components.
  • Voltage-Dependent Current Conveyor (VDCC) based filters offer potential for improved performance and component efficiency.

Purpose of the Study:

  • To design and validate an analog comb filter for suppressing 50 Hz power-line interference and its odd harmonics (150 Hz, 250 Hz, 350 Hz).
  • To demonstrate the feasibility of using cascaded VDCC-based notch filters for effective frequency suppression.
  • To highlight the advantages of independent parameter control and electronic tunability in the proposed filter architecture.

Main Methods:

  • Implementation of an analog comb filter by cascading multiple VDCC-based notch filters.
  • Utilizing VDCCs as the active building block for high-Q notch filters.
  • Simulation of the proposed filter design using PSPICE, incorporating commercial ICs (MAX435, AD844) for the VDCC.

Main Results:

  • The proposed comb filter effectively suppresses the fundamental frequency (50 Hz) and its first three odd harmonics.
  • Independent control over the quality factor (Q) and pole frequency of each notch filter was achieved.
  • The filter configuration requires a minimal number of active (1 VDCC) and passive (2 capacitors, 2 resistors) components per notch.
  • Simulations using MAX435 and AD844 confirmed the practical utility and performance of the designed filters.

Conclusions:

  • The VDCC-based analog comb filter provides an efficient and tunable solution for power-line interference suppression.
  • The design's component efficiency and independent parameter control offer significant advantages over conventional methods.
  • The use of readily available ICs validates the practical implementation of this filter topology.