A digitally controlled linear regulator for per-core wide-range DVFS of atom™ cores in 14nm tri-gate CMOS featuring non-linear control, adaptive gain and code roaming

Muthukaruppan, Ramnarayanan; Mahajan, Tarun; Krishnamurthy, Harish K.; Mangal, Sumedha; Dhanashekar, Am; Ghayal, Rupak; De, Vivek

doi:10.1109/esscirc.2017.8094579

Cited by 17 publications

(5 citation statements)

References 4 publications

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“…The power overhead in [42] is negligible since added decoders have little power consumption with respect to power PMOS. Similarly, the power overhead in [43] and [25] is negligible because the modifications add negligible power consumption. The works in [42] and [43] have AGS capability.…”

Section: Operation Of the Proposed Nbti-aware Dldo With Ags Capabilitymentioning

confidence: 99%

“…Similarly, the power overhead in [43] and [25] is negligible because the modifications add negligible power consumption. The works in [42] and [43] have AGS capability.…”

Section: Operation Of the Proposed Nbti-aware Dldo With Ags Capabilitymentioning

confidence: 99%

“…Distributing the electrical stress among all of the transistors can therefore be effective. The primary literature that address the aging effects of on-chip DL-DOs include a reliable digitally synthesizable linear drop-out regulator design, a digitally controlled linear regulator for per-core wide-range DVFS of Atom T M cores, and mitigation of NBTI induced performance degradation in on-chip DL-DOs [25,42,43]. To evenly distribute the workload, a decoding algorithm for DLDO is proposed in [42].…”

Section: Introductionmentioning

confidence: 99%

“…To evenly distribute the workload, a decoding algorithm for DLDO is proposed in [42]. A code roaming algorithm with per-core dynamic voltage and frequency scaling method is proposed in [43]. These techniques need dedicated control algorithms to enhance the reliability of a DLDO.…”

Section: Introductionmentioning

confidence: 99%

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Reliability Enhanced Digital Low-Dropout Regulator with Improved Transient Performance

Wang

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2020

IFIP Advances in Information and Communication Technology

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Digital low-dropout voltage regulators (DLDOs) have drawn increasing attention for the easy implementation within nanoscale devices. Despite their various benefits over analog LDOs, disadvantages may arise in the form of bias temperature instability (BTI) induced performance degradation. In this Chapter, conventional DLDO operation and BTI effects are explained. Reliability enhanced DLDO topologies with performance improvement for both steady-state and transient operations are discussed. DLDOs with adaptive gain scaling (AGS) technique, where the number of power transistors that are turned on/off per clock cycle changes dynamically according to load current conditions, have not been explored in view of reliability concerns. As the benefits of AGS technique can be promising regarding DLDO transient performance improvement, a simple and effective reliability aware AGS technique with a steady-state capture feature is proposed in this work. AGS senses the steady-state output of a DLDO and reduces the gain to the minimum value to obtain a stable output voltage. Moreover, a novel unidirectional barrel shifter is proposed to reduce the aging effect of the DLDO. This unidirectional barrel shifter evenly distributes the load among DLDO output stages to obtain a longer lifetime. The benefits of the proposed techniques are explored and highlighted through extensive simulations. The proposed techniques also have negligible power and area overhead. NBTI-aware design with AGS can reduce the transient response time by 59.5% as compared to aging unaware conventional DLDO and mitigate the aging effect by up to 33%.

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Section: Operation Of the Proposed Nbti-aware Dldo With Ags Capabilitymentioning

confidence: 99%

“…Similarly, the power overhead in [43] and [25] is negligible because the modifications add negligible power consumption. The works in [42] and [43] have AGS capability.…”

Section: Operation Of the Proposed Nbti-aware Dldo With Ags Capabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reliability Enhanced Digital Low-Dropout Regulator with Improved Transient Performance

Wang

Seçkiner

Köse

2020

IFIP Advances in Information and Communication Technology

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“…A system-level handle, per-core DVFS [190], has been utilized in [191] and [192] in the context of Atom T M and P ower8 T M processors, respectively. DVFS plays a crucial role in power and thermal management in the manycore systems given the technology scaling-driven increased power density and strict power budget, leading to phenomena of dark silicon [11].…”

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confidence: 99%

Scalable techniques for extending lifetime reliability of manycore systems

Rathore¹

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First, I want to thank my supervisor Prof. Thambipillai Srikanthan for giving me the opportunity of undertaking a Ph.D. under his sage guidance. His vision and most insightful advice have shaped this endeavor into a fruitful culmination-from choosing the topic to developing ideas and identifying any missing pieces to thesis writing. The motivation and kind support that he has provided have enabled the smooth continuation of the Ph.D., especially around the birth of my second daughter. This thesis would not have completed without the phenomenal support provided by my mentor Dr. Vivek Chaturvedi through his excellent guidance and constant help. The many technical discussions and numerous writing revisions have contributed profoundly to my research. A special note of thanks goes to Dr. Muhammad Shafique, whose exceptional guidance into research writing and the brainstorming into the formulation of some critical ideas have been vital for this thesis. Also, I thank Dr. Amit K. Singh for the most timely and critical review of my work, and Dr. Lam Siew-Kei for introducing me to the research field. I am grateful to Rohith R., the intern who developed the simulator. I thank Mr. Jeremiah, the administrative staff member of HESL, for the swift technical support. This journey was enlivened by the joyful presence of my friends Yan, Serene, Surabhi, Indira, Bhavan, Akhila, and Nruthya. My senior, Dr. Kavitha, has been a never-exhausting source of motivation. My colleague Kalindu has always been a high helping hand and provided me with insights. With my colleagues Deshya and Thilina, I shared many light moments and also a deep understanding. Peilan was my empath who understood the struggles of student-mothers. Meiqing uplifted me with her sweet demeanor. Kratika always made me positive. Dr. Jagadeesh was ever available with great advice. The role my husband, Virender Singh, and my daughters Prisha and Mitali in this thesis cannot be entirely expressed in words. Their sacrifice and love I can xi xii never repay. The positivity, comfort, fun, smile, and laughter they bring always rejuvenated me after a hard day. My husband's encouraging words, care, and understanding, as well as the technical discussions with him, made this journey possible. I thank Prisha for her loving smile and kindness, and Mitali for the zeal and strength she imparted. Also, the unconditional support of my parents-in-law and their highly understanding and helpful nature is almost not heard of elsewhere. My helpers have been the support-system allowing me to juggle work and personal responsibilities. The foundation of values and courage laid by my parents has been fundamental. My mother, Mrs. Pushpa Rathore has encouraged me throughout the journey. My brother and sisters have given me comfort and a listening ear whenever needed. I would forever remain indebted to Daaji, global guide of Heartfulness meditation system, for what has been given spiritually, equipping me with lightness, serenity, and positivity. My trainer and friend, Sis. Sheenah Hamid, has contr...

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