Abstract
This article presents a digital V2 constant on -time control buck converter with adaptive voltage positioning (AVP) and automatic closed-loop output impedance ( Z oc) calibration for advanced system-on-a-chip processors. To ensure that the output voltage deviation remains within the desired range, the system is equipped with AVP. For an optimal AVP design, the system includes a second-order digital inductor current sensor for deriving a constant Z oc within a wide bandwidth. A detailed system-level analysis was performed to design the proposed control architecture. Considering the inevitable variation and aging of power stage components, the system is equipped with an online real-time Z oc calibration mechanism established to ensure the performance of AVP control. A prototype chip was fabricated using a 90-nm complementary metal–oxide–semiconductor (CMOS) process. The digital controller was fully realized using a standard cell library. Under a 0.9-A load transient, the measured output voltage could be adequately constrained within a specified 1.1-V and 110-mV AVP window.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
