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1. stability analysis of low dropout linear regulators with a pmos pass element
Low-dropout linear regulators (LDOs) have gained popularity
with the growth of battery-powered equipment.
Portable electronic equipment including cellular telephones,
laptop computers and a variety of handheld electronic
devices has increased the need for efficient voltage regulation
to prolong battery life. Texas Instruments offers
several LDO products designed with PMOS pass transistors
with very low dropout voltage. Compared to the NPN
linear regulator, the LDO regulator can control its output
voltage with much less headroom. The NPN regulator
requires about 2 V of headroom while the LDO requires
less than half a volt...
2. Understanding noise in linear regulators.pdf
Types of noise in analog circuits may include thermal,
flicker, and shot noise, among others. In an LDO application,
noise is sometimes confused with power supply ripple
rejection (PSRR). Many times the two are lumped together
and loosely called “noise” just because both cause unwanted
signals on the output. This is incorrect. PSRR refers to
the amount of ripple on the output coming from ripple on
the input. Noise, on the other hand, is purely a physical
phenomenon that occurs with transistors and resistors
(capacitors are noise-free) on a very fundamental level. |
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eetop公众号
创芯大讲堂
创芯人才网
发表于 2009-10-22 20:43:11
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