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Transadmittance Type Universal Current-Mode Biquad Filter Using VDTAs.

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A novel resistorless filter using voltage differencing transconductance amplifiers (VDTA) achieves multiple filter functions. This design offers independent control over frequency and bandwidth with low sensitivities.

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Area of Science:

  • Electronics
  • Analog Signal Processing
  • Integrated Circuit Design

Background:

  • Universal filters are essential components in analog signal processing.
  • Existing designs often require resistors or lack independent control over key parameters.
  • Voltage Differencing Transconductance Amplifiers (VDTAs) offer a promising active element for filter design.

Purpose of the Study:

  • To propose a new resistorless single-input-multi-output (SIMO) universal transadmittance (TA) type filter.
  • To realize multiple filter functions (LP, HP, BP, BR, AP) using a compact topology.
  • To achieve independent control of natural angular frequency (ω0) and bandwidth (BW) with low sensitivities.

Main Methods:

  • Utilizing two Voltage Differencing Transconductance Amplifiers (VDTAs) as active elements.
  • Employing two grounded capacitors as passive elements.
  • Demonstrating filter functions and parameter control through PSPICE simulations.

Main Results:

  • The proposed topology successfully implements low pass (LP), high pass (HP), and band pass (BP) filter functions simultaneously.
  • Band reject (BR) and all pass (AP) filter responses are achievable with appropriate current connections.
  • Independent tuning of natural angular frequency (ω0) and bandwidth (BW) was confirmed.
  • Low active and passive sensitivities were observed.

Conclusions:

  • The proposed resistorless SIMO universal TA filter offers a versatile and efficient solution.
  • The design provides independent control over critical filter parameters, enhancing its applicability.
  • Simulation results validate the proposed configuration's performance and practicality for integrated circuit implementation.