scholarly journals A wide-range all-digital duty-cycle corrector with output clock phase alignment in 65nm CMOS technology

2011 ◽  
Vol 8 (15) ◽  
pp. 1245-1251 ◽  
Author(s):  
Ching-Che Chung ◽  
Duo Sheng ◽  
Sung-En Shen
Keyword(s):  
Duty Cycle ◽  
Cmos Technology ◽  
Phase Alignment ◽  
Wide Range

A WIDE-RANGE PROGRAMMABLE PULSE WIDTH CONTROLLER

2014 ◽  
Vol 23 (05) ◽  
pp. 1450075
Author(s):  
HADISEH BABAZADEH ◽  
ARASH ESMAILI ◽  
KHAYROLLAH HADIDI ◽  
ABDOLLAH KHOEI
Keyword(s):  
Duty Cycle ◽  
Power Supply ◽  
Pulse Width ◽  
Noise Source ◽  
Random Noise ◽  
Cmos Technology ◽  
Center Frequency ◽  
Maximum Speed ◽  
Frequency Range ◽  
Wide Range

A very simple, wide range and programmable pulse width controller or duty cycle corrector (DCC) is presented. Simulating the circuit in 0.35 μm Complementary MOSFET (CMOS) technology shows that the frequency range of the input signal can be within 250 MHz to 1.6 GHz, with a duty cycle of 30–70%. The proposed circuit generates an output signal with programmable duty cycle in the range of 30–70% with steps of 10% which could be extended to more steps by simple variations. The systematic peak-to-peak jitter at center frequency (1 GHz) is 1ps, while adding a random noise source of 5% of the power supply, increases it to 13 ps. the power consumption at maximum speed (1.6 GHz) is 4.9 mW. Monte Carlo simulations show maximum of 3.4% error at the 1.5 GHz input frequency and 70% output duty cycle.

scholarly journals Zero Average Surface Controlled Boost-Flyback Converter

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 57
Author(s):  
Juan-Guillermo Muñoz ◽  
Fabiola Angulo ◽  
David Angulo-Garcia
Keyword(s):  
Duty Cycle ◽  
Period Doubling ◽  
Power Converter ◽  
Control Technique ◽  
Average Surface ◽  
Flyback Converter ◽  
Stable Period ◽  
Period 2 ◽  
Wide Range ◽  
The Right

The boost-flyback converter is a DC-DC step-up power converter with a wide range of technological applications. In this paper, we analyze the boost-flyback dynamics when controlled via a modified Zero-Average-Dynamics control technique, hereby named Zero-Average-Surface (ZAS). While using the ZAS strategy, it is possible to calculate the duty cycle at each PWM cycle that guarantees a desired stable period-1 solution, by forcing the system to evolve in such way that a function that is constructed with strategical combination of the states over the PWM period has a zero average. We show, by means of bifurcation diagrams, that the period-1 orbit coexists with a stable period-2 orbit with a saturated duty cycle. While using linear stability analysis, we demonstrate that the period-1 orbit is stable over a wide range of parameters and it loses stability at high gains and low loads via a period doubling bifurcation. Finally, we show that, under the right choice of parameters, the period-1 orbit controller with ZAS strategy satisfactorily rejects a wide range of disturbances.

Effects of Auditory Stimulus Context on the Representation of Frequency in the Gerbil Inferior Colliculus

2001 ◽  
Vol 86 (3) ◽  
pp. 1113-1130 ◽  
Author(s):  
B. J. Malone ◽  
M. N. Semple
Keyword(s):  
Inferior Colliculus ◽  
Duty Cycle ◽  
Selective Adaptation ◽  
Stimulus Context ◽  
Effective Stimulus ◽  
Spatial Stimulus ◽  
Interaural Phase ◽  
Wide Range ◽  
Conditioned Responses ◽  
Frequency Changes

Prior studies of dynamic conditioning have focused on modulation of binaural localization cues, revealing that the responses of inferior colliculus (IC) neurons to particular values of interaural phase and level disparities depend critically on the context in which they occur. Here we show that monaural frequency transitions, which do not simulate azimuthal motion, also condition the responses of IC neurons. We characterized single-unit responses to two frequency transition stimuli: a glide stimulus comprising two tones linked by a linear frequency sweep (origin-sweep-target) and a step stimulus consisting of one tone followed immediately by another (origin-target). Using sets of glide and step stimuli converging on a common target, we constructed conditioned response functions (RFs) depicting the variability in the response to an identical stimulus as a function of the preceding origin frequency. For nearly all cells, the response to the target depended on the origin frequency, even for origins outside the excitatory frequency response area of the cell. Results from conditioned RFs based on long (2–4 s) and short (200 ms) duration step stimuli indicate that conditioning effects can be induced in the absence of the dynamic sweep, and by stimuli of relatively short duration. Because IC neurons are tuned to frequency, changes in the origin frequency often change the “effective” stimulus duty cycle. In many cases, the enhancement of the target response appeared related to the decrease in the “effective” stimulus duty cycle rather than to the prior presentation of a particular origin frequency. Although this implies that nonselective adaptive mechanisms are responsible for conditioned responses, slightly more than half of IC neurons in each paradigm responded significantly differently to targets following origins that elicited statistically indistinguishable responses. The prevailing influence of stimulus context when discharge history is controlled demonstrates that not all the mechanisms governing conditioning depend on the discharge history of the recorded neuron. Selective adaptation among the neuron's variously tuned afferents may help engender stimulus-specific conditioning. The demonstration that conditioning effects reflect sensitivity to spectral as well as spatial stimulus contrast has broad implications for the processing of a wide range of dynamic acoustic signals and sound sequences.

A 31 GHz body-biased configurable power amplifier in 28 nm FD-SOI CMOS for 5 G applications

2020 ◽  
pp. 1-18
Author(s):  
Florent Torres ◽  
Eric Kerhervé ◽  
Andreia Cathelin ◽  
Magali De Matos
Keyword(s):  
Power Amplifier ◽  
Complementary Metal Oxide Semiconductor ◽  
Cmos Technology ◽  
Silicon On Insulator ◽  
Oxide Semiconductor ◽  
Fully Depleted ◽  
Technology Roadmap ◽  
Wide Range ◽  
28 Nm ◽  
Soi Cmos

Abstract This paper presents a 31 GHz integrated power amplifier (PA) in 28 nm Fully Depleted Silicon-On-Insulator Complementary Metal Oxide Semiconductor (FD-SOI CMOS) technology and targeting SoC implementation for 5 G applications. Fine-grain wide range power control with more than 10 dB tuning range is enabled by body biasing feature while the design improves voltage standing wave ratio (VSWR) robustness, stability and reverse isolation by using optimized 90° hybrid couplers and capacitive neutralization on both stages. Maximum power gain of 32.6 dB, PAEmax of 25.5% and Psat of 17.9 dBm are measured while robustness to industrial temperature range and process spread is demonstrated. Temperature-induced performance variation compensation, as well as amplitude-to-phase modulation (AM-PM) optimization regarding output power back-off, are achieved through body-bias node. This PA exhibits an International Technology Roadmap for Semiconductors figure of merit (ITRS FOM) of 26 925, the highest reported around 30 GHz to authors' knowledge.

scholarly journals Domino Sense Analogous Contradict Planning of A CMOS

2019 ◽  
Vol 8 (6S2) ◽  
pp. 261-264
Keyword(s):  
Cmos Technology ◽  
Vlsi Circuits ◽  
Domino Logic ◽  
Flip Flop ◽  
Cell Library ◽  
Dynamic Circuits ◽  
Wide Range ◽  
Pipeline Segment

The fundamental target of this paper comprises of the domino rationale way and checking path. A fast wide range parallel contradicts that accomplishes high working frequencies throughout an account pipeline segment demeanor utilizing just three undemanding redundant CMOS-rationale module types. The three essential module types are isolated by D flip failure. The three element types are set in an exceedingly dull constitution in the tallying way and Domino Logic way. Enthusiastic domino rationale circuits are broadly utilized in present day computerized VLSI circuits. These dynamic circuits are utilized in superior structures. Along these lines simultaneously refreshing the tally state with a consistent deferral at all tallying way module regarding the clock edge. This construction is versatile to self-assertive portion counter widths utilizing just the three module types. The deferral counter is contained the underlying module admittance times only, three-info AND-entryway delay and a D-type flip-flop. The motivation behind the project is to diminish the Power utilization and CMOS Technology in the counter way and Domino rationale way by utilizing DSCH in Microwind Tool. The proposed Counter way is structured utilizing 0.10µm TSMC Digital cell library and its expended 0.215mW.

Wide and continuous dynamic tuning of period, modulation depth and duty cycle of a laminar-flow-based microfluidic grating

Lab on a Chip ◽  
2021 ◽  
Author(s):  
Lin Chen ◽  
Liying Liu ◽  
Lei Xu
Keyword(s):  
Laminar Flow ◽  
Duty Cycle ◽  
Modulation Depth ◽  
Dynamic Tuning ◽  
Wide Range ◽  
Continuous Dynamic

A laminar-flow-based all-liquid grating whose period, modulation depth and duty cycle can be dynamically and continuously tuned in a wide range.

The Fluid Dynamics of LPT Blade Separation Control Using Pulsed Jets

2001 ◽  
Author(s):  
Jeffrey P. Bons ◽  
Rolf Sondergaard ◽  
Richard B. Rivir
Keyword(s):  
Boundary Layer ◽  
Duty Cycle ◽  
Separation Bubble ◽  
Vortex Generator ◽  
Boundary Layer Separation ◽  
Skew Angle ◽  
Suction Surface ◽  
Duty Cycles ◽  
Wide Range ◽  
Vortex Generator Jets

The effects of pulsed vortex generator jets on a naturally separating low pressure turbine boundary layer have been investigated experimentally. Blade Reynolds numbers in the linear turbine cascade match those for high altitude aircraft engines and industrial turbine engines with elevated turbine inlet temperatures. The vortex generator jets (30 degree pitch and 90 degree skew angle) are pulsed over a wide range of frequency at constant amplitude and selected duty cycles. The resulting wake loss coefficient vs. pulsing frequency data add to previously presented work by the authors documenting the loss dependency on amplitude and duty cycle. As in the previous studies, vortex generator jets are shown to be highly effective in controlling laminar boundary layer separation. This is found to be true at dimensionless forcing frequencies (F+) well below unity and with low (10%) duty cycles. This unexpected low frequency effectiveness is due to the relatively long relaxation time of the boundary layer as it resumes its separated state. Extensive phase-locked velocity measurements taken in the blade wake at an F+ of 0.01 with 50% duty cycle (a condition at which the flow is essentially quasi-steady) document the ejection of bound vorticity associated with a low momentum fluid packet at the beginning of each jet pulse. Once this initial fluid event has swept down the suction surface of the blade, a reduced wake signature indicates the presence of an attached boundary layer until just after the jet termination. The boundary layer subsequently relaxes back to its naturally separated state. This relaxation occurs on a timescale which is 5–6 times longer than the original attachment due to the starting vortex. Phase-locked boundary layer measurements taken at various stations along the blade chord illustrate this slow relaxation phenomenon. This behavior suggests that some economy of jet flow may be possible by optimizing the pulse duty cycle and frequency for a particular application. At higher pulsing frequencies, for which the flow is fully dynamic, the boundary layer is dominated by periodic shedding and separation bubble migration, never recovering its fully separated (uncontrolled) state.

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