Design of Low-power and Wide-swing Absolute Value Circuit
A low power and wide swing absolute value circuit is proposed.The circuit determines the polarity of an input voltage according to the output result of a comparator.Positive values are preserved via negative feedback,whereas negative values are converted into positive values using a voltage-current conversion circuit and current mirror.Compared with traditional designs using diodes,this circuit mitigates issues such as poor linearity and high power consumption.The circuit is designed using a 55-nm CMOS process.Simulation results indicate that under supply voltages of-1.2 and 1.2 V,the voltage input swing can reach a wide range from-400 to 400 mV and an error of less than 0.5％,with power consumption of 450 μW over a layout area of 4 800 μm2.
absolute value circuitlow powerwide swingarea efficient
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