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PSRR of Capless LDO (Read 5266 times)

msudans New Member Offline Posts: 5 India	PSRR of Capless LDO Oct 11^th, 2007, 9:48pm I need to design an LDO which must be stable and function without an off-chip capacitor. Can I get a PSRR > 30 dB for frequencies beyond 1 MHz? Thanks
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HdrChopper Community Fellow Offline Posts: 493	Re: PSRR of Capless LDO Reply #1 - Oct 14^th, 2007, 8:53pm Hi, Your PSRR at frequencies above 1Mhz will mainly depend on your DC open loop gain and the dominant�s pole frequency: the higher frequency the dominant pole is located at, the better PSRR at higher frequency. In other words, you�ll need a large GBW loop. Regards tosei
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jimwest Junior Member Offline Posts: 26	Re: PSRR of Capless LDO Reply #2 - Oct 19^th, 2007, 7:21pm To Tosei, Usually the LDO system cannot be simplized as one-pole system. There are dominat pole non-dominat pole and compensate zero within the unity gain bandwidth. Among them the dominat pole is much lower than 1MHz. So the upper limit of the PSRR determins by the distance between the zero and the dominant pole. K/R, Jim
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lightgo New Member Offline Posts: 6	Re: PSRR of Capless LDO Reply #3 - Nov 9^th, 2007, 5:57am psr>30dB for all frequence?
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