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A 1.8–5.5-V LDO–BGR System With LACM Buffer for High PSRR in Camera Applications
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DOI：10.1109/TCSII.2025.3578616.png)
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Abstract
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This brief proposes a low-dropout regulator (LDO) and bandgap reference (BGR) system designed for camera applications, where high power supply rejection ratio (PSRR) and low output noise are critical. To achieve a stable output across a wide load range from no load to 600 mA a load-adaptive current-mirror (LACM) buffer is introduced. The LACM buffer effectively regulates current flow across different load conditions, minimizing power loss while ensuring stable operation. Additionally, a sample-and-hold (S/H)-based BGR is implemented to eliminate noise propagation from the supply voltage <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$(V_{\mathrm { SYS}})$ </tex-math></inline-formula> to the reference voltage <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$(V_{\mathrm { REF}})$ </tex-math></inline-formula>, further enhancing PSRR. The proposed system was fabricated using a 0.18-<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>m CMOS process.
Keywords:
Low-dropout regulator (LDO)
LDO-BGR system
camera application
high-power-supply-rejection-ratio (PSRR)
low output noise
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