LV/LP CMOS Four-Quadrant Analog Multiplier Cell in Modified Bridged-Triode Scheme
Analog Integrated Circuits and Signal Processing
MWSCAS '98 Proceedings of the 1998 Midwest Symposium on Systems and Circuits
A Low-Voltage CMOS Exponential Function Circuit for AGC Applications
SBCCI '98 Proceedings of the 11th Brazilian Symposium on Integrated circuit design
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Analog Integrated Circuits and Signal Processing
A 35 dB-linear exponential function generator for VGA and AGC applications
Proceedings of the 2004 Asia and South Pacific Design Automation Conference
ICANN '09 Proceedings of the 19th International Conference on Artificial Neural Networks: Part I
FGMOS based voltage-controlled resistor and its applications
Microelectronics Journal
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Superior-Order Curvature-Correction Techniques for Voltage References
Low-voltage low-power improved linearity CMOS active resistor circuits
Analog Integrated Circuits and Signal Processing
IEEE Transactions on Neural Networks
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Microelectronics Journal
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International Journal of Circuit Theory and Applications
Low-voltage FGMOS based analog building blocks
Microelectronics Journal
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
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International Journal of Circuit Theory and Applications
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IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews
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The paper proposes new accurate exponential circuits, having a multitude of practical applications in analog signal processing. The original method for obtaining the exponential function is based on the utilization of new superior-order approximation functions. The accuracy of the proposed structures is excellent and the output dynamic range is strongly extended as a result of the fourth-order approximation and of the independence of implemented function on technological errors and on temperature variations (the best original proposed architecture of the exponential generator has an output dynamic range of 70dB for an approximation error smaller than +/-1dB). The exponential circuits are designed for implementing in 0.18@?m CMOS technology, having a low-voltage operation (a minimal supply voltage of 1V). The power consumptions of the proposed exponential circuits are smaller than 0.08mW, for a supply voltage of 1V. As application of the new exponential circuit, a dB-linear VGA circuit with high output dynamic range will be presented. The new computational structures have the possibility of generating any continuous mathematical function, presenting also an increased modularity and controllability and reduced design costs per implemented function.