Wide-Loading-Range Fully Integrated LDR With a Power-Supply Ripple Injection Filter

A low-dropout regulator for on-chip application with a power-supply rejection (PSR) boosting filter circuit for enhancing supply noise rejection at middle-to-high frequency over a wide loading range is presented in this brief. The idea has been analytically modeled and experimentally verified with a standard 0.13- μm CMOS process. The on-chip compensation capacitance is 1 pF. For the PSR filter design, the total on-chip capacitance is 20 pF. From the experimental results, the implemented regulator can operate with supply voltage of 1.2 V with nominal dropout voltage of 0.2 V at maximum load of 50 mA and IQ of 37.32 μA.