电源纹波消除与线性LDO

‘Peace and quiet’ is a scarce commodity in our lives, and with the relentless demand for highly integrated, low cost mixed-signal system-on-chip (SoC) solutions, it is even less frequent in integrated circuits (ICs). Densely populated SoC environments are plagued with broad-spectrum noise generated from low and high frequency digital, radio frequency (RF), and switching power supply circuits, reaching hundreds of milli-volts and extending from several thousand to a few giga-Hertz. As power supplies drive these rapidly changing loads, noise is created in the supply busses and therefore propagated throughout the chip. It creates jitter and generally deteriorates the dynamic range and spectral fidelity of sensitive analog functions like data converters, phase-locked loops (PLLs), voltage-controlled oscillators (VCOs), and the like [3-6], which is how and why linear regulators have come to amass so much demand.

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