Surface acoustic waves (SAW’s) have been optically generated and detected on metallic spheres. The source was a focused yttrium aluminum garnet (YAG) laser operated in the Q-switched mode probe sensitive optical heterodyne interferometer. curvature of surface gives rise to dispersive effects. variation SAW group velocity is deduced from evolving waveforms pulses after propagating few turns around sphere. observation pulse at positions away pole (a point diametrically opposite source) reveals...

A theory as the basis for solving nonlinear boundary value problems is described. new analysis presented reflection, which reveals that there a two-dimensional spatial increase of second-harmonic wave. The accretion along propagation direction result self-interaction primary wave; one in wave front due to restriction.

Resistive Random Access Memory (ReRAM)-based analog computing-in-memory (CIM) is a promising approach to tackle the memory wall problem in data-intensive operations. However, ReRAM-based CIM, area and energy overhead imposed by DACs ADCs hinders potential of CIM. To alleviate this problem, an 8-bit 70 MS/s SAR ADC with linearity-improved bootstrapped switch transconductance-enhanced dynamic comparator presented work. All active devices are placed beneath capacitors save area, resulting core...

This article presents a CMOS transistor-based smart temperature sensor for ON-chip thermal management. The utilizes proportional to absolute (PTAT) and complementary (CTAT) currents control their ring oscillators then generates digital code accordingly. Replacing constant with (CWT) current CTAT as the reference brings two benefits: 1) dynamic range of output is enlarged 2) design complexity path reduced. nonlinearity introduced by can be mitigated in circuit evaluating its Taylor formula...

Rayleigh and whispering gallery waves have been excited in a steel sphere of 20 nm diameter by YAG (yttrium aluminum garnet) laser beam whose intensity was modulated Bragg cell. The normal component the vibration measured sensitive interferometric probe. Resonances both modes observed range 100-1500 kHz. As predicted analysis mechanical displacement distribution on surface, wave resonances gave larger probe signals than waves. Q-factors were about 10/sup 4/. This observation technique...

The second-harmonic generation of leaky waves at the interface between glass and iron has been investigated. Fundamental frequency are excited by bulk shear waves, incident critical angle, generated surface detected reradiated waves. amplitudes second harmonic obey square law. decreases sharply as detection drive deviate from angle.

A modified SAW diode convolver is presented which works with backward biased diodes, so that no bias resistor needed and taps are isolated from one another. The new distribution of makes it possible for the to operate at lower frequencies enables a relatively wide bandwidth. experimental results device 28 have been given.

STW (surface transverse wave) resonators on quartz have been widely used in temperature stable oscillator as frequency source applications. In this paper, we use the software FEMSAW based FEM/BEM theory to study resonator. To simulate resonator with enough accuracy, is modified by introducing two parameters include propagation attenuation due material itself substrate and loss Al electrode. By numerical experiment, found that for synchronous there exists an optimum thickness of electrode,...

In recent advancements, the traditional von Neumann architecture has been challenged by computational needs of AI. This is due to its high power and data transfer costs. As a solution, computing-in-memory (CIM) architecture, which combines storage computation, gained attention for superior energy efficiency. Within CIM, using resistive random access memory (RRAM) arrays, readout circuit, converts analog outputs from multiply–accumulate operations into digital signals, faces limitations area...

The high frequency SAW transducers have shown great vitality in mobile phone and satellite communications so on. One of the important ways to raise working keeping size strips unchanged is utilize devices based on velocity acoustic wave modes. Therefore, investigation quasi-longitudinal surface leaky waves (QLASLWs) significant because its potential applications. Both theoretical experimental results LiNbO/sub 3/ quartz are this paper, for example, range Euler angles (0/spl deg/, /spl beta/,...

Abstract The γγ collider is proposed in China to observe scattering and the Breit Wheeler (BW) pairs production.This paper presents a prototype readout electronics system that intended provide suitable solution for collider. analyzes requirements of such as implementation 1426 electronical channels limited space, stability vacuum working environment incident particle discrimination. To meet requirements, proposes high-density, low-power high-sampling-rate (1 GHz) using waveform digitization...

Two incident ultrasonic shear wave beams of 7.5 MHz interact at glass-metal interface, and the reflected longitudinal 15 normal to interface are investigated. This effect is identified as a nonlinear sum frequency signal convolution two input signals. The efficiency measured about 106 dBm for glass-iron interface. observation reveals that quality bonding has significant influence on output. So found be useful implementation or nondestructive evaluation layer. Theoretical analysis...

This paper describes a novel quasi-longitudinal acoustic wave mode waveguide (QLWMW) for sensing the concentration of liquid solution with different dielectric constant. The waveguide, operating at frequency 18.6 MHz, consists 128° Y cut lithium niobate 450 mm thick substrate along direction perpendicular to X axis crystal. variation velocity in is demonstrated, be very sensitive constant contact back surface by experimental measurement pure liquids, such as toluene, 2-propanol, acetone,...

This paper presents a CMOS transistor-based smart temperature sensor for on-chip thermal management. The utilizes proportional to absolute (PTAT) and complementary (CTAT) currents control ring oscillators generate digital code accordingly. Using CTAT instead of constant with (CWT) current as the reference brings two benefits: 1) dynamic range output is enlarged; 2) design complexity path reduced. nonlinearity introduced by frequency can be mitigated in circuit evaluating its Taylor formula....

A systematic derivation of the coupled amplitude equation governing propagation acoustic wave in a general anisotropic solid is presented, using method multiple scales. The uniformly valid prior to discontinuity and reveals evolution each order harmonic accurately. higher generation some SAN-materials also investigated results are compared with those given by successive approximation method.

It is found that the nonlinear behavior of piezoelectric resonators more complicated than predicted by previous theories. Actually work as parametrically excited vibration systems. Mode-coupled equations are obtained means boundary integration. The method multiple scales used to solve equations. Finally ordinary differential govern evolution amplitude and phase fundamental harmonics, respectively, derived. resonator in vicinity primary resonance thoroughly studied. Experiments conducted for...

The second-harmonic generation due to the interface nonlinear effect was studied theoretically and experimentally. Two ultrasonic shear wave beams of 7.7 MHz were incident from glass side glass-iron in opposite directions with same angle. elastic interaction produces a beam longitudinal 15.4 normal interface. received has triangle shape as input tone burst waves have rectangular modulation.. time delay is reasonable. output amplitude relates square law. influence transducer positions shows...

A new adaptive filter for cancelling narrow-band interference in spread spectrum communications systems is described this paper. The employs a SAW injection-locked oscillator (SAWILO) to track CW signal simulated system. demonstrates 20 dB cancellation over the locking bandwidth of SAWILO real time. offers advantage terms complexity other equivalent systems. presented with experimental measurements.

A dynamic theory is developed for piezocomposites with 2-2 connectivity. By solving the coupled equations in piezoceramic plate and polymer region subjected to boundary conditions at ceramic-polymer interface, distributions of elastic electric variables a composite are obtained. The electromechanical coupling factor, acoustic impedance, resonant frequency, between ceramic thickness resonance can be determined. effects mode on lateral elucidated dependence frequency these modes estimated....