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Single VDGA-Based Mixed-Mode Universal Filter and Dual-Mode Quadrature Oscillator
Natchanai Roongmuanpha1, Worapong Tangsrirat1, Tattaya Pukkalanun1
1School of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand.
Sensors (Basel, Switzerland)
|July 27, 2022
Summary
This study introduces novel mixed-mode filter and quadrature oscillator circuits using a single voltage differencing gain amplifier (VDGA). These designs offer versatile mode operation, electronic control, and simplified topology for advanced analog circuit applications.
Area of Science:
- Analog Integrated Circuit Design
- Signal Processing Circuits
Background:
- Traditional biquadratic filters and quadrature oscillators often require complex topologies and multiple active components.
- Achieving multi-mode operation (VM, CM, TAM, TIM) and independent control of parameters like frequency and quality factor presents a design challenge.
Purpose of the Study:
- To propose and validate new circuit designs for a mixed-mode universal biquadratic filter and a dual-mode quadrature oscillator.
- To demonstrate the utility of a single voltage differencing gain amplifier (VDGA) in achieving versatile filter and oscillator functionalities.
- To analyze the impact of VDGA non-idealities and parasitic elements on circuit performance.
Main Methods:
- Development of circuit topologies for a mixed-mode universal biquadratic filter and a dual-mode quadrature oscillator utilizing a single VDGA, one resistor, and two capacitors.
- Implementation of simultaneous biquadratic filter functions in voltage-mode (VM), current-mode (CM), trans-admittance-mode (TAM), and trans-impedance-mode (TIM).
- Design of a dual-mode quadrature oscillator with simultaneous voltage and current outputs, featuring orthogonal control of oscillation conditions and frequency, and using grounded passive components.
Main Results:
- The proposed circuits successfully implement universal biquadratic filter functions in all four modes with electronic frequency adjustment and single-resistance controllable quality factor.
- A dual-mode quadrature oscillator with simultaneous voltage and current outputs was realized, offering independent control over oscillation parameters and employing grounded passive elements.
- Computer simulations using TSMC 0.18 μm CMOS technology and experimental verification with LM13600 integrated circuits confirmed the theoretical performance characteristics.
Conclusions:
- The single-VDGA based mixed-mode universal biquadratic filter and dual-mode quadrature oscillator offer a simplified topology and enhanced performance.
- The proposed circuits provide versatile functionalities, including multi-mode operation and independent parameter control, suitable for various analog signal processing applications.
- The study validates the effectiveness of the VDGA as a versatile building block for advanced analog circuit design.
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