VCII Active Inductor Simulator With Tunable Impedance Multiplication
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Solution Overview
Problem
Conventional tunable filters and inductor simulators require multiple elements 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 inductor simulation function is achieved, but device complexity increases and frequency range is limited
Solution Approach 1:
The patent combines multiple functions (inductor simulation, impedance multiplication, frequency tuning) into a single VCII-based circuit topology. By merging the inductor simulation function with impedance multiplication capability and using a single VCII instead of multiple conveyors, the circuit achieves wide frequency range operation while reducing component count to just two passive elements (one capacitor and one resistor).
Solution Approach 2:
The VCII circuit is designed to perform multiple functions simultaneously: it acts as a simulated inductor, an impedance multiplier, and a frequency-tunable element all within a single configuration. The circuit can operate across different frequency ranges by adjusting component values, making it a universal solution for various filtering applications without requiring different circuit topologies.
2Productivity
If current conveyor CCII is used, then current-mode signal processing advantages are achieved, but low-impedance voltage output port is lacking requiring extra voltage buffer
Solution Approach 1:
The patent extracts the voltage output function directly from the VCII's inherent capabilities, specifically utilizing its low-impedance voltage output port (Z terminal). By taking out and utilizing this built-in voltage output capability, the circuit eliminates the need for external voltage buffer amplifiers that would be required if using CCII, thereby reducing overall device complexity while maintaining current-mode signal processing advantages.
3Reliability
If large number of elements are used in simulated inductor, then inductor simulation accuracy is improved, but integration and area efficiency are reduced
Solution Approach 1:
The patent creates an accurate inductor simulation effect without using physical inductors or large numbers of passive components. By using the VCII's voltage and current relationships along with a single capacitor and resistor, the circuit copies the impedance characteristics of a grounded inductor (Zin = sL) while occupying minimal circuit area, enabling easy integration into modern CMOS technology.
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.