The Design of An LDO Regulator [The Analog Mind]

Many mixed-signal systems incorporate LDO regulators to generate local supply voltages for various building blocks. LDOs isolate the circuits from one another’s noise and from the noise on the global supply, ${V}_{\text{DD}}$. For optimum performance, the design of each LDO is tailored to the particular cell that it feeds. For example, an LDO developed for a flash analog-to-digital converter is quite different from one serving a VCO.