LOW-DROPOUT LINEAR REGULATOR (LDO), METHOD FOR PROVIDING LDO AND METHOD FOR OPERATING LDO

摘要

PPROBLEM TO BE SOLVED: To provide a low-dropout linear regulator with improved PSRR. PSOLUTION: The LDO has two nodes which are configured to couple a differential amplifier and a regulated current mirror and to receive a differential signal, respectively. The regulated current mirror is configured to convert and amplify the differential signals to a single ended signal. The LDO has a first capacitor configured for frequency compensation. The first capacitor is coupled between the first stage and a second stage. The LDO has a second capacitor for balancing capacitive loading of a first cascode circuit. The second capacitor is coupled between the first stage and the supply voltage. The first cascode circuit is configured to suppress different voltages between input and output of the capacitors caused of a modulation of the supply voltage. The LDO has a second cascode circuit configured to suppress supply modulations of the differential amplifier. PCOPYRIGHT: (C)2011,JPO&INPIT