An improvement of the current–voltage conversion technique in over-current sensing circuit for low-power low dropout linear voltage regulators

Abstract

In this paper, a resistance-less over-current sensing circuit using current-voltage conversion technique for CMOS low dropout linear voltage (LDO) regulators with PMOS as pass device is proposed. The scheme of this over-current sensing uses the I-V conversion technique. This improvement results in an elimination of the body effect and reduces the deviation of the current limiter. The resulting current clamp value only varies from 190 to 250 mA when the supply voltage varies from 2.7 to 5 V. The total quiescent current of the LDO is 3.51 uA at the 5 V supply voltage. The current consumption of the overcurrent sensing circuit is about 1 uA.

Low-cost wearable device based D-shaped single mode fiber curvature sensor for vital signs monitoring

“…slope (-2dB) = -0.04542 slope (-4dB) = -0.05048 slope (-6dB) = -0.03987 slope (-8dB) = -0.04157 slope (-10dB) = -0.07208 conversion circuit is based on the principle of transimpedance amplifier circuit [shown in Fig.4(b)], and the optical signal is converted into electrical signal[45]. The IV conversion and amplification circuit have a maximum voltage amplification factor of 100.…”