This paper presents an adaptive RF-DC power converter designed to efficiently convert RF signals DC voltages utilizing auxiliary transistors control the threshold voltage of in main rectifier chain dynamically. The proposed circuit passively reduces forward-biased increase harvested and output increases reverse-biased reduce leakage current prevent loss previously stored energy. A 12-stage threshold-compensated is implemented IBM's 0.13 μm CMOS technology. exhibits measured maximum...

This paper presents a 324-element 2-D broadside array for radio astronomy instrumentation which is sensitive to two mutually orthogonal polarizations. The composed of cruciform units consisting group four Vivaldi antennas arranged in cross-shaped structure. antenna used this exhibits radiation intensity characteristic with symmetrical main beam 87.5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> at 3 GHz and 44.2 6 GHz. measured maximum...

This paper presents a hybrid forward and backward threshold voltage compensated radio-frequency to direct current (RF-to-DC) power conversion circuit for RF energy harvesting applications. The proposed uses standard p-channel metal-oxide semiconductor transistors in all the stages except first few allow individual body biasing eliminating need triple-well technology previously reported compensation schemes. Two different RF-DC circuits, one optimized provide high efficiency (PCE) other...

This paper presents, a wide input range, 4-stage threshold voltage compensated RF-to-DC power converter, designed to efficiently convert RF signals dc voltages by applying an optimum compensation produced subthreshold auxiliary transistors. The proposed optimally rectifiers can achieve higher efficiency over wider range compared other circuits where the level of is limited circuit structure and varies with power. rectifier implemented in three possible ways. technique be applied chain...

This paper presents a systematic design methodology for impedance matching circuits of an RF energy harvester to maximize the harvested range input power levels with known distribution. Design networks rectifier differs from those traditional such as low-noise amplifier because transistors in rectifiers operate different regions. In this work, it is shown that estimated based on small signal simulation at peak when are biased stable DC operating voltage provides largest fixed power. For...

This brief presents a millimeter-wave passive reflection-type phase shifter (RTPS) capable of producing 360° shift range with low insertion loss (IL) in 28-30 GHz range. The circuit consists 90° Lange coupler and two multi-resonance loads where switched inductor CMOS varactors are employed. As opposed to previously reported RTPS requiring multiple control voltages, the proposed reflective load requires only one voltage for which results simplicity reduced dc power consumption blocks....

To employ the distributed amplification technique for design of ultra-wide-band low-noise amplifiers, poor noise performance conventional amplifiers (DAs) needs to be improved. In this work, terminating resistor gate transmission line, a main contributor overall DA's figure, is replaced with resistive-inductive network. The proposed network creates an intentional mismatch reduce contribution degraded input matching at low frequencies can tolerated applications as they need operate above 3...

This paper presents a new high-gain structure for the distributed amplifier. Negative capacitance cells are exploited to ameliorate loading effects of parasitic capacitors gain in order improve amplifier while keeping desired bandwidth. In addition, negative circuit creates resistance that can be used increase Implemented 0.13-μm IBM's CMRF8SF CMOS, proposed six-stage an average 13.2 dB over bandwidth 29.4 GHz. The measured input return loss is less than -9 and output -9.5 entire With chip...

This paper proposes charge pumps with improved power efficiency suitable for low-power on-chip applications. Undesired transfer, which has a direction opposite to that of the intended current flow, presents significant source loss in pumps. The proposed pump circuit utilizes transfer switches complementary branch scheme significantly reduce undesired thereby improving and increasing output voltage effectively. An optimized gate control strategy is applied further decrease caused by transfer....

This paper presents a millimeter-wave wide tuning range voltage-controlled oscillator (VCO) incorporating two switchable decoupled VCO cores. When the first core is switched on producing low frequency band (LFB) signal and second off, inductors of are reused to create additional buffers that pass LFB output buffers. The generated high (HFB) signals by when turned on, directly fed Producing outputs both cores across same terminals without utilizing active/passive combiners coupled will...

This paper presents a fully integrated RF-powered temperature sensor with non-intermittent operation. The is powered up wirelessly from 915-MHz incident signal using power-efficient RF energy harvester, uses subthreshold ring oscillator that produces highly temperature-dependent oscillation frequency acting as temperature-to-frequency converter, and finally transfers the frequency-modulated to an external reader back scattering. power management circuits are eliminated in designed arrive at...

This paper presents a wide-tuning range dual-mode millimeter wave (mm-wave) voltage controlled oscillator (VCO) incorporating high quality-factor (Q) transformer-based variable inductors. A Q switched inductor with two different values is proposed by constructing the load of transformer fixed capacitor in series lossless switch structure that does not add any loss to LC-tank as implemented changing signals mode across capacitor. By choosing proper center frequency for each and sufficient...

This paper presents and demonstrates a voltage feedback-based technique to implement power management integrated circuit (PMIC) for piezoelectric energy harvesting. It is analytically shown that the conducting time interval of rectifying diode at maximum point fixed ratio vibration period. Thus, it can be used as feedback track without measuring output current/power. The tailored various interface circuits, including full-bridge, doubler, synchronized switch harvesting on an inductor....

An area-efficient multistage 3.0- to 8.5-GHz ultrawideband low-noise amplifier (LNA) utilizing tunable active inductors (AIs) is presented. The AI includes a negative impedance circuit (NIC) consisting of pair cross-coupled NMOS transistors and tuned vary the gain bandwidth (BW) amplifier. Fabricated in 90-nm digital CMOS process, proposed fully on-chip LNA occupies core chip area only 0.022 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This brief presents a fully integrated cross-coupled voltage multiplier for boosting dc-to-dc converter applications. The proposed design applies new structure of doubler (CCVD) and clock scheme that eliminates all the reversion power loss increases efficiency (PE). In addition, this is scalable to multiple-stage (voltage multiplier) as maximum gate-to-source/drain or drain-to-source does not exceed nominal supply V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A tunable CMOS active inductor is presented. The circuit uses a cross-coupled pair of transistors providing positive feedback for enhanced quality factor. biased with controllable current source varying the and tuning inductor. proposed designed simulated in 90 nm digital process. It shows wide-frequency range inductive impedance very high resonance frequency. By cascading two inductors, wideband filter/amplifier to characterise performance.

An 8-stage distributed amplifier (DA) suitable for 40Gb/s optical communication is implemented in a 0.13 μm CMOS process. The losses of on-chip transmission lines are compensated by active negative resistors. DA achieves flat gain 10dB from DC to 44GHz with an input and output matching better than -8dB. core loss compensation circuitry dissipate 44mW 59mW, respectively.

This paper describes a 60-GHz artificial transmission line phase shifter designed in 65-nm CMOS technology. To increase the shift range and preserve matching over entire range, fixed series inductors standard cell are substituted by tunable inductors. The required constructed using transformer with secondary loaded varactor. verify operation principle, shifters, including one-, two- three-cell, manufactured. experimental is 45° for one-cell, 92° two-cell, 133° three-cell shifters. These...

This article introduces a nonisolated bidirectional converter with high-voltage conversion ratio. In the proposed converter, by integrating two-phase low-voltage-side (LVS)-parallel high-voltage-side (HVS)-series coupled inductors, features, such as high voltage gain, low stresses, current sharing, and ripple cancelation, are achieved. Due to converter's operation in triangular conduction mode, desirable benefits of zero switching, diode reverse recovery elimination, reduction filter...

This paper presents a systematic methodology for the co-design of matching network and rectifier radio frequency (RF) harvesters that results in maximum power conversion efficiency (PCE) given available power. method is based on our newly developed model capable calculating CMOS Dickson's rectifier's input/output voltages at input low/high regimes. The proposed allows fraction time takes design RF energy harvester using previously models relying knowledge voltage levels where computationally...

Abstract Distributed Acoustic Sensing (DAS) through fiber optic has been deployed in downhole monitoring for over two decades. Several technological advancements led to a wide acceptance of this technology as reliable surveillance technique. This paper presents comprehensive technical review all the applications DAS. The starts with fundamentals deployment. Then, an overview DAS including seismic application (vertical profiling), microseismic (hydraulic fracturing characterization), well and...

The letter demonstrates a coaxial transmission line-to-substrate integrated waveguide (CT-SIW) transition using aperture-coupling approach. method broadens the bandwidth (BW) and reduces insertion loss (IL). Two line supports with apertures for coupling are attached at ends of substrate (SIW). copper inlaid increases to SIW can be controlled by aperture length wire put in aperture. was designed, fabricated, experimentally evaluated. provides measured 10 dB return (RL) fractional BW (FBW)...