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Keywords
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Ultra low power, Low Voltage, Current Output Stage, Class AB, Current High Capability, High Output Impedance
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Abstract
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In this paper a novel current output stage (COS) is introduced. Deliberately compose of class AB operation and a special feedback scheme grants it such following ever demanded merits at power supplies of ± 0.5V.Ultra Low Power(P)of 5.2µW, Ultra high Output resistance (RO)of 13GΩ and Ultra High Ratio of 500 for output current over bias current at low THD of -32dB. Most desirably this capability increases with supply so that reaches the unique ratio of 5000 at ± 3.5V (where these voltages are allowed), low THD of -31dB, and RO of 60MΩ. These marvelous results are verified by HSpice simulation using 0.18µm CMOS technology of TSMC. The Process robustness and the stability of the proposed COS are verified by Monte Carlo simulation and stepwise response, respectively.
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