In this paper, a 3.2-3.6 GHz two-stage Doherty power amplifier (PA) module is proposed for fifth-generation (5G) massive multiple-input multiple-output (MIMO) base stations. A detailed design method and procedure compact low-loss combiner suitable the PA are introduced. Based on combiner, implemented using gallium nitride (GaN) transistors surface-mounted devices (SMDs) with packaged size of 8 × mm2. The achieves 3 dB small-signal bandwidth 3.1-3.9 peak gain 31.7 dB. From 3.2 to 3.6 GHz,...

This article presents a resistor-array-tuning-based hybrid adaptive digital delay compensated rectifier for wireless power transfer systems. A no-crossing problem and nonlinearity conventional delay-compensations are analyzed. In order to enhance the robustness of control, <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> -delay xmlns:xlink="http://www.w3.org/1999/xlink">off</small> with different compensation schemes. The is...

This letter presents an active rectifier with SAR-assisted coarse-fine adaptive digital delay compensation technique for biomedical implantable devices. Both on- and off-delays are compensated by adjusting the comparator offset. In order to achieve accurate zero-voltage switching against process, voltage, temperature variations, a two-step tuning method is introduced. The coarse-tuning phase fine-tuning controlled 7-bit SAR controller 3-bit bidirectional counter, respectively. Meanwhile,...

This paper 5 presents a novel charge balancing (CB) with current-control (CC) mode and voltage-control (VC) for implantable biphasic stimulators, which can achieve one-step accurate anodic pulse generating. Compared the conventional short-pulse-injection-based CB, proposed method could reduce time avoid inducing undesired artifact. The CC operation compensates majority stimulation at high speed, while VC guarantees CB precision. In order to eliminate oscillation during transition, smooth...

This brief presents a phase-shift pulse-width modulation (PWM) control based single-stage wireless charger with constant-current constant-voltage (CC-CV) charging. The proposed implements the AC-power rectification, voltage regulation and CC-CV charging only in rectifier stage to realize high receiver efficiency. Compared prior arts, PWM is adopted order achieve continuous duty-ratio improve battery-charging resolution. For stability enhancement, an analog smooth transition technique...

A fully-integrated relaxation oscillator with a typical frequency of 1.37 MHz is proposed. Neither comparators nor the reference voltage required in proposed oscillator. constant temperature (CWT) current source has been utilized to achieve good stability. Moreover, conventional comparator replaced controlled delay element (VCDE) avoid offset effect. Furthermore, variation against supply eliminated by matching bias voltages starved (CSDE) ramp generator and VCDE. The implemented 0.25 μm BCD...

An on‐chip 23 kHz dual‐phase relaxation oscillator is presented. Charge‐transfer and comparator offset cancellation techniques have been proposed to achieve low power high temperature stability. The circuit has designed with 0.18 μm CMOS process. achieved an ultra‐low of 130 nW, a supply voltage sensitivity 0.8%/V over 1.2–1.8 V, coefficient 30 ppm/°C .

This letter presents a digital rectifier-based single-stage wireless charger. The proposed charger regulates charging current by adjusting the size of power switch digitally, and loss can be reduced adaptively according to condition. conversion efficiency is consequently improved significantly. Furthermore, high resolution low output voltage ripple have been achieved introducing successive approximation method. Compared with conventional analog-controlled technique, control shorten mode...

This paper proposes a novel method for assessing the power transfer limit (PTE) concerned transmission corridor under transient stability constraints. A index called time margin is introduced. Sensitivity of to generation shift between generators utilized enhance approach in PTE assessment. The reallocation strategy including contingency filtering, ranking and sensitivity analysis described detail. Case studies on 10-generator New England test system are reported validate effect method.

This paper presents an energy-efficient wireless power receiver for implantable electrical stimulation applications, which can achieve one-step adiabatic bipolar-supply that is generated by a hybrid single-stage dual-output regulating (SSDOR) rectifiers. The structure using only four switches overcomes the disadvantages two output voltage values in traditional rectifiers are close to each other. A constant-current (CC) controlled dynamic scaling (DVS) technique proposed minimize headroom of...

An accurate programmable average inductor current limit method for buck DC-DC converters with peak mode (PCM) control is presented. A Gm-C filter used to sense the voltage drop across a sensing resistor in series inductor. Then, converted into signal by voltage-to-current (V2I) converter. The superposed on output of error amplifier adjust current. converter has been designed 0.18 µm BCD process. value 1 A/2 50 mΩ/25 mΩ, respectively. When equivalent load resistance steps from 10 Ω 2.5 Ω/1.67...

This paper presents a novel constant on-time (COT) single-stage reconfigurable regulating rectifier for wireless power transfer system. Compared with the discrete multi-cycle pulsewidth modulation technique adopting in prior-art rectifiers, proposed achieves high resolution by adjusting duty ratio continuously and smoothly. In addition, load-transient response is much faster COT control method. order to optimize output voltage ripples, cycle designed be small via minimizing on-time. receiver...

This paper proposes an integrated low-power relaxation oscillator using a feedback voltage to boost the swing of capacitor. A conventional comparator is replaced by inverter chain, and static power consumption could be greatly reduced. Moreover, variation on threshold has no affection frequency stability. Since proportional supply, capacitor charging discharging current which supply designed avoid influenced voltage. The circuit been with 0.18 μm CMOS process. 190 kHz. simulation shows that...

This paper presents a novel single-stage dual-output wireless power transfer system with an adaptive global control. The of freewheeling mode mentioned in the traditional reconfigurable regulating rectifier is used as another output, which achieves high light-load conversion efficiency (PCE) receiver. voltage one channel regulated by local constant on-time control, while In this way, all received almost transmitted to output. proposed designed 0.18 μrn BCD process, and regulates two outputs...

In this paper, the problems of control and synchronization a new hyperchaotic Lorenz system with uncertain parameters are studied. Based on Lyapunov stability theory adaptive theory, is suppressed to its unstable equilibrium. Furthermore, between two identical systems achieved by proposing an law parameter estimation update law. Numerical simulations presented demonstrate analytical results.

In this paper, the Allan variance technique is used in analyzing output signal of a fiber optic gyroscope, by which characteristics noise terms angular velocity data was determined. Then we process random drift FOG with Kalman Filter based on theory time series analysis. On other hand, an LMS adaptive filter also applied to data. Comparative analysis filtering effect and their advantages disadvantages both algorithms carried out. The results show has certain role suppressing more effective...

In this work, an efficient active rectifier for wireless power transmission (WPT) with pulse-width-modulation (PWM) controlled delay-compensated loop is proposed. The proposed scheme can eliminate both on- and off-delay of by regulating the pulse width gate voltage V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">GN1</sub> NMOS transistor directly a single feedback loop. This work also achieve exact zero-voltage switching (ZVS) in various...

A novel high speed current sensing circuit for integrated peak-current-mode buck converter is proposed in this paper. The technique combines and Pulse-Width-Modulation comparator (PWM) into one module. In way the signal transmission time greatly reduced, eventually increases operation frequency. Moreover, paper presents a to convert error amplifier voltage differential signals with same amplitude opposite phase, then they are added comparator's inputs respectively. By avoiding direct...

This paper proposes a ZVS active rectifier with adaptive on/off delay compensation for wireless power transfer (WPT) systems. Both on- and off-delay have been automatically compensated to maximum the on-time avoid reverse current, eventually improving efficiency (PCE). The against process, voltage temperature (PVT) variation has eliminated by adding only one feedback loop adjust comparator offset according sampling AC voltage. Furthermore, circuit adopts single simultaneously compensate both...