Shagun Bajoria, M. Snoeij, V. Schaffer, Mikhail V. Ivanov, Sijia Wang, K. Makinwa
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A 36V voltage-to-current converter with dynamic element matching and auto-calibration for AC ripple reduction
A 36V precision voltage-to-current converter for 0–24mA loops is presented. It utilizes dynamic element matching (DEM) and an auto-calibration technique to achieve low DC inaccuracy (0.2%) and low DEM ripple (0.007%). Measurement results show that the auto-calibration suppresses the DEM ripple by a factor of 14, thus eliminating the need for a bulky off-chip ripple-suppression filter. The prototype chip is implemented in a 0.35μm CMOS process occupying 0.84mm2. It has a quiescent current of 0.5mA and a rise time of 10.2μs for a 1mA–23mA output step.
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