Abstract
In this paper a new true current-mode RMS-to-DC converter circuit based on a square-root-domain squarer/divider and simplified current-mode low pass filter is presented. The circuit is designed by employing up-down translinear loop and using of MOSFET transistors that operate in strong inversion saturation region. The converter offer advantages of two-quadrant input current, low circuit complexity, large dynamic range, low supply voltage (1.2 V) and immunity from the body effect. Moreover, the power consumption of the circuit for the maximum accepted input current is less than 100 μW and does not need extra biasing to inject current into transistors. The circuit has been simulated by HSPICE. The simulation results with 0.18 μm CMOS technology are seen to conform to the theoretical analysis and shows benefits of the proposed circuit. Simulation results show high performance of the proposed circuit.
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