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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Electronically Tunable Differential Integrator: Linear Voltage Controlled Quadrature Oscillator.

Rabindranath Nandi1, Sandhya Pattanayak2, Palaniandavar Venkateswaran1

  • 1Department of Electronics & Telecommunication Engineering, Jadavpur University, Kolkata 700032, India.

International Scholarly Research Notices
|June 28, 2016
PubMed
Summary

A novel electronically tunable differential integrator (ETDI) and voltage-controlled quadrature oscillator (VCQO) were developed using a composite current feedback amplifier and multiplication mode current conveyor (MMCC). These circuits offer electronically tunable parameters for advanced wave shaping and signal generation applications.

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Area of Science:

  • Electronics
  • Analog Circuit Design
  • Signal Processing

Background:

  • Composite active building blocks enhance circuit performance.
  • Electronically tunable circuits are crucial for flexible signal processing.

Purpose of the Study:

  • To propose a new electronically tunable differential integrator (ETDI) and voltage-controlled quadrature oscillator (VCQO).
  • To achieve linear tuning laws for frequency and time constants using a control voltage.
  • To demonstrate wave shaping and sinusoid generation applications.

Main Methods:

  • Utilizing a composite current feedback amplifier with a multiplication mode current conveyor (MMCC).
  • Analyzing integrator phase error and oscillator sensitivity to parasitic capacitances.
  • Implementing and testing a double-integrator feedback loop (DIFL) oscillator.

Main Results:

  • The integrator and oscillator exhibit electronic tunability via MMCC control voltage.
  • Negligible phase error in the integrator and low oscillation frequency sensitivity were observed.
  • A sinusoid oscillator demonstrated a linear tuning range of 60 KHz–1.8 MHz with low THD (2.1%).

Conclusions:

  • The proposed ETDI and VCQO offer effective electronic tunability and high performance.
  • The MMCC-based composite active element is suitable for advanced analog circuit design.
  • Experimental results validate the proposed circuits for practical applications in wave shaping and oscillation.