Active Inductor Simulator Circuit With VCII+ and OTA Frequency Tuning
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Solution Overview
Problem
Conventional tunable filters and inductor simulators require multiple components and are not suitable for wide frequency ranges, lacking flexibility and efficiency in modern electronic systems.
Innovation Solution
A tunable grounded positive and negative active inductor simulator and impedance multiplier circuit using a single second-generation voltage-mode conveyor (VCII+) with operational transconductance amplifier (OTA) and passive components, allowing for frequency tuning by selecting resistor and capacitor values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional VCII-based simulated grounded inductor uses plus type VCII and negative type VCII in addition to three passive components, then the simulated inductor can be realized, but the device complexity increases and frequency range is limited
Solution Approach 1:
The patent combines both plus type VCII and negative type VCII functions into a single negative type VCII circuit by appropriate connection configuration. This merging reduces the component count from two VCII circuits to one, thereby simplifying the device structure while maintaining the ability to simulate grounded inductors across wide frequency ranges.
Solution Approach 2:
The negative type VCII circuit is designed to perform multiple functions: it can operate as a simulated grounded inductor, function as a capacitance multiplier, and serve as an impedance scaling circuit. This multi-functionality eliminates the need for separate circuits for different applications, reducing overall device complexity while enhancing adaptability across frequency ranges.
2Power
If current conveyor CCII is used, then better gain-bandwidth products are provided, but the lack of low-impedance voltage output port requires extra voltage buffer
Solution Approach 1:
The VCII circuit is designed to provide both current-mode signal processing capabilities and a low-impedance voltage output port, combining functions that previously required separate circuits. This eliminates the need for additional voltage buffer stages while maintaining the high gain-bandwidth product characteristic, thereby reducing device complexity without sacrificing power performance.
3Extent of automation
If conventional voltage conveyor circuits are used, then current-mode signal processing is achieved, but they are not suitable for wide frequency range applications
Solution Approach 1:
The patent employs parameter tuning techniques where the values of passive components (resistors and capacitors) are optimized to extend the operational frequency range of the VCII circuit. By carefully selecting and adjusting these parameters, the circuit maintains stable current-mode signal processing performance across a broad frequency spectrum, from low to high frequencies.
Data Source
AI summary
A tunable grounded positive and negative active inductor simulator and impedance multiplier circuit and a method for implementing the tunable grounded positive and negative active inductor simulator and impedance multiplier circuit are described. The circuit includes one second generation voltage-mode conveyor circuit (VCII+), a voltage source configured to generate an output current, a first impedance, a second impedance and an operational transconductance amplifier OTA. The first impedance is connected between the voltage source and the positive VCII+ input terminal, Y. The second impedance is connected between the second output terminal and a ground terminal. The OTA is configured to have a transconductance gain. The circuit is configured to be tuned by a selection of values for the first and second impedances.