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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Versatile tunable current-mode universal biquadratic filter using MO-DVCCs and MOSFET-based electronic resistors.

¹Department of Electronic Engineering, Ming Chi University of Technology, Taiwan.

Thescientificworldjournal

|July 2, 2014

Summary

This study introduces a flexible current-mode universal biquadratic filter using multi-output differential voltage current conveyors (MO-DVCCs). The novel design achieves multiple filtering functions with low component count and high output impedance for easy cascading.

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Area of Science:

Electronics Engineering
Analog Signal Processing
Integrated Circuit Design

Background:

Current-mode filters are essential for high-speed signal processing.
Existing designs often require numerous components or lack flexibility.
The need for tunable, multi-functional filters with cascadable structures persists.

Purpose of the Study:

To propose a novel, versatile, and tunable current-mode universal biquadratic filter.
To achieve multiple filtering responses (bandpass, highpass, bandreject, allpass) from a single configuration.
To demonstrate orthogonal controllability of filter parameters and low sensitivity.

Main Methods:

Utilizing two multi-output differential voltage current conveyors (MO-DVCCs) and two grounded capacitors.
Employing MOSFET-based electronic resistors to replace conventional grounded resistors.
Configuring the circuit for both two-input/three-output and three-input/single-output operations.

Main Results:

Simultaneous realization of bandpass, highpass, and bandreject responses in the two-input/three-output mode.
Easy access to all five generic filtering functions in the three-input/single-output mode.
Achieved orthogonal tuning of quality factor and resonance angular frequency with low passive and active sensitivities.

Conclusions:

The proposed current-mode universal biquadratic filter offers significant versatility and component efficiency.
The design's high output impedance facilitates straightforward cascading for complex filter implementations.
Post-layout simulations confirm the circuit's functionality and performance, validating its practical applicability.