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提出一种全集成低 dropout 稳压器 (LDO)，实现了 0.65ns 的响应时间和 3.01ps 的 FoM 值，并在全频谱范围内保持高电源抑制比 (PSR)，解决了 SoC 中对高速、高 PSR LDO 的需求。
High performance low-dropout regulators (LDOs) are indispensable in a systemon-a-chip (SoC) due to their low output noise, fast transient response and good power supply rejection (PSR) characteristics. In general, differential analog circuit loads need an LDO with high PSR, digital circuit loads need an LDO with fast load transient response, while single-ended analog/RF circuit loads need an LDO with both high PSR and fast transient response. Figure 17.11.1 shows an LDO embedded in an optical receiver that helps improve the sensitivity of the front-end system. On-chip LDOs with PSR in the GHz range are in high demand for wideband optical communication systems because there is only one photo detector in the optical receiver and supply voltage variations would degrade its sensitivity severely [1]. Off-chip capacitors are conventionally connected to supplies for filtering purposes. With a large output capacitor CL, say 1μF, small ripples due to load
Yan Lu, Wing-Hung Ki, C. Patrick Yue
Hong Kong University of Science and Technology, Hong Kong, China