Design Techniques for External Capacitor-Less LDOs with High PSR over Wide Frequency Range
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© 2014 IEEE. The paths for power supply noise leakage in low drop-out (LDO) voltage regulators are analyzed, and techniques are discussed to minimize their effects on the output voltage. An internally compensated high power supply rejection (PSR) LDO voltage regulator with adaptive supply noise compensation scheme is presented. Its regulated output voltage is 1.6 V to provide 0-50 mA of current with a power supply of 1.8 V. The measured PSR is better than -50 dB up to 4 MHz. The fabricated LDO occupies 0.25 mm2 in a 0.18 μm CMOS technology. It consumes 80 μA of ground current. The load regulation for a 50 mA step with 100 ns rise/fall times is 200 mV.
author list (cited authors)
Park, C., Silva-Martinez, J., & Onabajo, M.