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Related Concept Videos

Active Filters01:25

Active Filters

1.4K
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
1.4K
Passive Filters01:27

Passive Filters

1.2K
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Second-order Op Amp Circuits01:19

Second-order Op Amp Circuits

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Implementing second-order low-pass filters in audio systems is crucial in refining audio signals by eliminating undesirable high-frequency noise. These filters typically involve second-order op-amp circuits configured as voltage followers, encompassing two nodes with distinct storage elements.
The analysis of such circuits follows a systematic approach, similar to the second-order RLC circuits. In practical scenarios, bulky inductors are rarely employed due to their size and weight. This means...
675
Op Amp AC Circuits01:18

Op Amp AC Circuits

676
Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).
676
Series Resonance01:17

Series Resonance

1.1K
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
1.1K
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

904
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Tunable first-order resistorless all-pass filter with low output impedance.

Parveen Beg1

  • 1Department of Electronics Engineering, A.M.U., Aligarh 202002, India.

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|March 4, 2014
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Summary

This study introduces a new tunable first-order all-pass filter using a novel differential difference dual-X current conveyor with a buffered output (DD-DXCCII) and a single MOS transistor. This design enables cascadable filter realization with improved performance and parasitic analysis.

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Area of Science:

  • Electronics
  • Analog Circuit Design
  • Signal Processing

Background:

  • All-pass filters are crucial for phase shifting in various electronic systems.
  • Existing designs often require multiple active elements or complex configurations.
  • There is a need for efficient, tunable, and cascadable filter designs.

Purpose of the Study:

  • To present a novel voltage-mode, cascadable, first-order all-pass filter.
  • To utilize a newly developed active element, the differential difference dual-X current conveyor with a buffered output (DD-DXCCII).
  • To demonstrate tunability using a single passive component (MOS transistor).

Main Methods:

  • The filter is realized using one DD-DXCCII, one capacitor, and one MOS transistor.
  • The low output impedance of the DD-DXCCII facilitates the realization of higher-order filters.
  • Non-ideal and parasitic effects of the filter are thoroughly investigated.
  • Simulations were performed using TSMC 0.25 µm technology.

Main Results:

  • A functional voltage-mode tunable first-order all-pass filter is successfully designed.
  • The cascadable nature allows for higher-order filter construction.
  • Parasitic analysis confirms the practical viability of the proposed design.
  • Simulation results validate the filter's performance.

Conclusions:

  • The proposed DD-DXCCII based filter offers a simple, efficient, and tunable solution.
  • It provides a valuable building block for advanced analog signal processing circuits.
  • The design demonstrates good performance characteristics suitable for integrated circuit implementation.