SYSTEM AND METHOD FOR ENHANCING BANDWIDTH OF LOW-DROPOUT REGULATORS USING POWER TRANSMISSION LINES FOR HIGH SPEED INPUT OUTPUT DRIVER

摘要

Power supply rejection (PSR) peaking in Low Dropout (LDO) voltage regulators can lead to reduced bandwidth and efficiency. This paper presents a new design method by combining power transmission lines (PTL) with LDOs for enhancing its bandwidth and efficiency. This approach is applicable for LDOs regulating high speed I/O drivers. The PTL combined with decoupling capacitors on the package or board are used to mitigate the PSR peaking. This methodology is demonstrated using printed circuit board test vehicles with off-the-shelf components. When compared to conventional approaches, the PTL solution showed ˜80% lower power supply noise.