This paper presents a novel capacitor-less low-dropout regulator (LDO) for mobile applications. The proposed LDO utilizes multiple feedback loops to satisfy several design challenges some applications which were not considered in the previous LDOs. has wide bandwidth of 3.03 MHz at load current 150 mA with bias 40 μA, and best line regulations 0.0024%/V 0.0000417%/mA, respectively, are improvements over previously reported chip 100 mV dropout voltage maximum current. A total capacitance 29...

Energy harvesting is one of the key technologies used to realize self-sustaining systems such as wireless sensor networks and health-care devices. Much research on circuit design has been conducted extract much energy possible from transducers, thermoelectric generator (TEG) piezoelectric transducer (PZT). Specifically, in a PZT could be extracted more efficiently by utilizing resonance [1] [2] demonstrated. However, maximum output voltage swing those techniques are limited twice original...

A dual-path step-down converter (DPDC) is presented for achieving high power efficiency in the mobile management ICs (PMICs). Adopting a hybrid structure using one inductor and flying capacitor, proposed DPDC supplies load current via two parallel paths, relieved an intrinsic problem of conventional buck (CBC) topology, which significant loss from large DCR (R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">DCR</sub> ). Therefore, achieves thus...

This article proposes a new boost converter topology called dual-path step-up dc-dc (DPUC). Unlike the conventional (CBC), DPUC has hybrid structure using one inductor and flying capacitor to make dual current delivery paths. allows continuous delivering output, reducing both dc level of output voltage ripple. Therefore, higher efficiency smaller ripple than those CBC. In addition, feedforward characteristic can alleviate effect right-half-plane zero that degrades transient response. Even...

While the demand for micro-energy harvesters (μEHs) is increasing (for seamless energy source in applications such as wireless sensor node), two major problems still obstruct versatile use of them. The first problem self-startup capability. Because many nodes are likely to be located where human-maintenance difficult, starting them up manually can difficult replacing battery. Its realization has been because μEHs must able turn itself on without any stored energy. Some previous works have...

This paper presents a double pile-up resonance energy harvesting circuit that efficiently and simultaneously extracts from piezoelectric transducer (PZT) thermoelectric generator. The proposed harvester operates in mode (DPM) to extract PZT with the enhanced damping force, resulting 1452% improvement power extraction, which is best performance among state-of-the-art works. also boost converter (BCM) without an additional switch, achieving 75% conversion efficiency at 450-μW output power....

This letter proposes a loop-free autocalibration technique for self-balancing of flying capacitors in three-level dc-dc buck converter. The proposed converter utilizes dual-path power stage with balancing switches that adaptively short at de-energizing phases. Thus, the ensures capacitor voltages are self-balanced half input voltage without using additional feedback calibration loops, leading to robust operation and competitive efficiencies. prototype was fabricated 0.13-μm CMOS BCD process...

DC-DC boost converters are widely used to increase the supply voltage in various applications, including LED drivers, energy harvesting, etc. [1-5]. The conventional converter (CBC) is shown Fig. 27.5.1, where switches S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> and xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> turned on off alternately at φ , respectively, inductor current (I xmlns:xlink="http://www.w3.org/1999/xlink">L</sub>...

Abstract Supercapacitors are promising energy storage devices with high charging/discharging speeds and power densities. To improve their poor stability, we fabricated electrodes by integrating perovskite materials (La 0.8 Sr 0.2 Mn 0.5 Co O 3-δ , LSMCO) possessing redox reaction ability graphene nanoplatelets exhibiting good electronic properties. One of the resultant composites (L25G70) demonstrated capacitance excellent retention (95% after 5000 cycles). These results superior to other...

In this letter, a noninverting buck-boost converter with state-based current control is proposed for Li-ion battery management. Unlike conventional multimode in converters, our scheme utilizes state controller single-level error and checking clock to define the operation mode at every cycle. The enables seamless transition stable output regulation fixed interleaving patterns even when input voltages are similar, ensuring robust change inherent hysteresis. prototype IC was fabricated 0.18-μm...

This paper presents a pseudo single-stage (PSS) amplifier with an adaptively varied medium impedance node to achieve ultra-high slew rate (SR) and at the same time stable operation in wide capacitive load range. Owing characteristics of proposed technique, this achieves 1.1-to-8.67 V/μs 0.01-to-1.66 MHz unity gain frequency over 0.1-to-15 nF (C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> ) 69° phase margin while consuming total...

A DC-DC converter, which tracks minimum power loss under various conditions, is presented in this paper. With a new approach for optimum efficiency, implements theoretical equations intactly at the circuit level, was adopted. This has high reliability against process variation. The concept of lossless soft-switching also adopted discontinuous-conduction-mode (DCM) operation. proposed converter maximum efficiency 91% switching frequency 1 MHz. able to maintain around 90% over whole range...

A robust multioutput self-regulated rectifier without any switching circuitry is proposed in this letter for wirelessly powered biomedical devices, especially neural stimulators. The system utilizes the series and parallel resonant configuration low- high-side outputs, respectively, by using only one capacitor. provides dual high voltages of ±14 V neuro stimulator low voltage 2.1 operating systems such as read-out digital circuits.

This letter proposes an ultralow power single-inductor multiple-output converter for implantable stimulation system. minimizes the number of switches turning <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> and xmlns:xlink="http://www.w3.org/1999/xlink">off</small> to deliver outputs 0.8, 1.8, 20 V, it uses a soft-switching technique all switching nodes. It also operates with self-oscillating controller only when require power. As...

This letter presents a 2-phase 3-level (2P3L) envelope tracking supply modulator (ETSM) for long-term evolution 20 MHz (LTE20) radio frequency power amplifier as solution the ET system. 2P3L ETSM that is composed of only switching converters achieves high efficiency, fast transient response, and small output current ripple. To properly operate proposed ETSM, 4 pulse width modulatiop (PWM) signals with 90° phase shift from each PWM signal are required without any mismatch between duty cycles....

An envelope modulator (EM) is presented to increase the efficiency of an RF power amplifier. In order supply output voltage higher than input while providing low-frequency in EM, a single-inductor dual-output (SIDO) converter introduced. By employing SIDO converter, EM does not require additional boost converter. addition, high-frequency (HFC) with wide-bandwidth capability also proposed. These two converters, and HFC, are combined parallel without ac coupling capacitor by current-balancing...

This paper presents a phase-cut dimmable ac-dc buck LED driver for electrolytic capacitor-less lighting applications. In the driver, sine-reference band (SRB)-controlled average current technique is proposed to perform rectified sine-average control and dimming control. The can regulate value of sine-wave current, maintaining high power factor (PF) over wide range ac input voltage output load. not only makes compatible with two types dimmers, namely, leading-edge trailing-edge types, but...

In this paper, a resonant current-mode receiver is studied to charge low-voltage batteries wirelessly for supplying medical implantable systems. To increase efficiency, the root-mean-square (rms) current in LC tank of (RX) reduced by using voltage-boosted (VBCM) receiver. This combines conventional with switched-capacitor converter boost voltage instantaneously at switching node (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">X</sub> ) coil....

To supply power to implantable systems, wireless transfer (WPT) is an attractive solution. There are two types of WPT receivers (RXs), voltage-mode (VM) RX [1], [2] and current-mode (CM) [3], [4]. The VM-RX suitable when the coupling coefficient (k12) between transceiver (TX) coils sufficiently high. However, in many practical cases, k12 low because a considerably small implanted coil and/or relatively long distance TX coils, as shown Fig. 32.1.1 (top). In this case, CM-RX more suitable....

Herein we propose a new PWM controller for DC-DC converter with Self-aligned Comparator Control (SCC), the purpose of which is to overcome sub-harmonic switching and hysteretic characteristics that are problematic in conventional comparator control schemes. In proposed scheme, condition output voltage converted form phase difference through SCC block. The main loop regulates inductor current built up an optimum value by using this difference. addition SCC, fully integrated on-chip without...