A Fully Integrated FVF LDO With Enhanced Full-Spectrum Power Supply Rejection

This article presents a fully integrated flipped voltage follower (FVF) based low-dropout (LDO) regulator with enhanced full-spectrum power supply rejection (PSR) and unity-gain bandwidth over 400MHz for noise-sensitive circuits. Following the study of three types of FVF LDO's PSR performances, we propose a novel FVF LDO with a low-gain fast loop-1 and a high-gain slow loop-2. In prior FVF LDOs, their PSRs are either full-spectrum, or not, but with low PSR at low frequency. In this article, we fully utilize both dc gains of loop-1 and loop-2 for the low-frequency PSR, while the high-frequency PSR remains unchanged. In addition, we use dynamic compensation to push the loop-2's UGB to higher frequency for a better PSR bandwidth. This work, fabricated in 65 nm complementary metal oxide semiconductor (CMOS), with 1.2-V input and 1-V output, exhibits a measured quiescent current (I
_Q
) varying from 27 to 82 μA for a load current I
_LOAD
between 5 μA and 20 mA. The circuit achieves a low frequency PSR of -58 dB with the worst full-spectrum PSR of -9 dB in 20 mA I
_LOAD
with a 300 pF on-chip output capacitor. Further, with an UGB over 400 MHz, the proposed FVF LDO reaches 0.9 ns response time when I
_LOAD
changes between 100 μA and 20 mA with edge times less than 0.8 ns.