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US 7,952,395 B2Granted
Universal CMOS current-mode analog function synthesizer
AssigneeKing Fahd University of Petroleum and Minerals
InventorsMuhammad Taher Abuelma'atti, Nawal Mansour Al-Yahia
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Abstract
The universal CMOS current-mode analog function synthesizer is based on approximating the required function using its sixth-order Taylor series expansion. These approximations can be implemented by adding the weighted output currents of a number of basic building blocks built around a basic current squarer, and a constant current. The circuit can simultaneously realize thirty-two different mathematical functions and can be easily expanded to accommodate many others.
Claims10
A universal CMOS current-mode analog function synthesizer, comprising:
- a current squarer circuit;
- power factor raising circuits connected to the current squarer circuit;
- a DC current source;
- and
- a weighted current amplifier connected to the DC current source, the power factor raising circuits, and the current squarer circuit, the weighted current amplifier summing outputs of the DC current source, the current squarer circuit and the power factor raising circuits, the weighted current amplifier having weights representing successive terms of a Taylor series expansion of a nonlinear function of interest;
- wherein a current output of the weighted current amplifier approximates the nonlinear function of interest using the weights representing the plurality of terms in the Taylor-series expansion of the function.
3 more elements
Dependencies are inferred from the claim text.