Design of Low Voltage Low Power Current Mode Analog Computational Unit Using MOSFETs in Weak Inversion

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Saudi Digital Library
The major objective of this research is to design low-voltage current-mode logarithmic and exponential circuits using MOSFETs in weak inversion region. In this regard, two different structures for current-input current-output logarithmic amplifiers and 96dB linear exponential function generator are proposed. The proposed circuits are simulated with standard CMOS 0.35μm process technology to validate the theoretical analysis. Simulation results confirm that the proposed structures achieve the required goals in terms of low voltage operation and low power consumption while at the same time show stable performance with temperature and process variations. To demonstrate the effectiveness, logarithmic and exponential circuits are used as core cells to introduce different analog signal processing applications such as computational circuit and variable gain amplifiers (VGAs).