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The presence of common-mode noise in differential lines is a major contributor to signal integrity problems in high-speed digital systems. Common-mode noise is typically excited by skew. It can occur due to timing mismatches at the driver, length mismatches due to routing constraints, or phase velocity mismatches due to inhomogeneous dielectrics with fiber-weave effect. Common mode noise results in...
A 3D packaging based 4-channel X-band receiver module is implemented using low temperature co-fired ceramic (LTCC) technology. A dual-mode X-band bandpass filter (BPF), an lumped-element branch-line coupler and an lumped BPF is proposed for the receiver module, respectively. The overall size of the module is only 54 mm × 60 mm × 1 mm. The measured gain parameter, noise figure (NF), image rejection...
A simple circularly polarized (CP) antenna array is proposed for millimeter-wave applications. The proposed CP antenna array has a two-layer structure, which is easy for fabrication. A circular loop with a parasitic element is used as the radiation element for wideband operation. It is shown that the proposed 4×4 CP antenna array can achieve a gain of 13–16 dBi from 28.5 to 31.5 GHz.
On-wafer measurements of any Device Under Test (DUT) usually require the application of a calibration algorithm to eliminate unwanted but unavoidable effects due to the probe tip properties, the probe pad, the neighboring structures on the wafer and instrumentation. The calibration is to remove their influence and to reveal the properties of the DUT itself. However, the calibration process is sensitive...
A broadband power divider using Lange couplers and short-circuited stubs is described. The divider comprises three Lange couplers, two short-circuited stubs, and a delay line. Fabricated power divider on an FR4 substrate exhibits a coupling of 3.6 ± 0.7 dB and a phase difference of 45 ± 2° from 0.4 to 0.74 GHz.
A compact low phase noise oscillator based on substrate integrated waveguide (SIW) structure is presented. The oscillator employs a third-degree cross-coupled bandpass SIW filter as the frequency stabilization element. Meanwhile, the groupdelay and the complex quality factor (Qsc) are all taken into consideration for the oscillator design, which is more accurate than the traditional method. The measured...
We explore the frequency dependence of piezoceramic disc transducers bonded to plates. For some transducer dimensions, the frequency response shows a sharp peak. This behavior is inconsistent with the use of short pulses or broadband chirps for flaw localization. We use finite element simulation to show that the highly resonant behavior is caused by a high-strain region immediately beneath the transducer...
I.H.P. SAW (Incredible High-Performance SAW) has a novel multi-layered structure to confine SAW energy in substrate surface area, and it shows extremely high quality (Q) factor, low temperature coefficient of frequency (TCF) and improved electromechanical coupling coefficient (K2). This paper introduces its mechanism of the high acoustic Q factor, both theoretically and experimentally, and its applications...
In order to study relaxation characteristics of viscoelasticity of the liquid, a wide frequency sweep in the range of MHz to GHz is desired. We, therefore, report a new type HBAR (High-overtone Bulk Acoustic Resonator: shear mode ScAlN film on AT-cut quartz plate) sensor which makes it possible to operate in a wide frequency range as shown in Fig. 1. When a thickness shear acoustic mode (TSM) resonator...
In this paper, single crystalline silicon (SCS) anisotropy is exploited to suppress support loss in side-supported breathing-mode thin-film piezoelectric-on-silicon (TPoS) disc resonators for the first time. Contrary to the case of isotropic materials, for an SCS breathing-mode disc resonator, displacement is not uniform at the outer edges of the resonator. It is shown that for high order harmonics,...
In this paper, a demonstration of a standard pair of complementary split ring resonators (CSRR) can be enhanced by the addition of another pair of rings. These additional pairs allow for greater enhancement of the standard CSRRs ability to mitigate unwanted frequencies, and enhance desired frequencies. Various ring orientations and geometries are crafted and simulated in COMSOL. At 2.4 GHz, the band-pass...
In this paper a kind of SSPC was designed and fabricated using thick film hybrid circuit technology. More than 1000 SSPC products went through the screening test according to GJB2438A. The screening procedure including thermal shock, high temperature power burn-in test, constant acceleration, hermetic sealing test and particle impact noise detection (PIND). Also 1000h life test was applied to samples...
Surface acoustic wave (SAW) resonators with a moderate bandwidth and a large impedance ratio are obtained by Hetero Acoustic Layer (HAL) structure combing a LiTaO3 (LT) thin plate and the substrate, which has a high velocity of leaky SAW and a small frequency temperature coefficient (TCF). In this study, a new type of HAL SAW resonators were fabricated using 0.5-1 μm thick 42oYX or 20oYX LT and 42...
This paper briefly recalls the design of a silicon test chip specially conceived to study the noise propagation trough the silicon substrate and the ESD protection. The noise source is a logic block designed to emulate the clock tree of a microcontroller. The experimental results obtained on two versions of the test chip are reported and discussed. The two test chips have the same schematic, but they...
This paper examines a two-dimensional (2-D) parallel-plate parabolic reflecting structure to implement the Beam forming network (BFN) for the directional beam radiation of phased array of antennas, which is realized in the substrate integrated waveguide (SIW) structure. To further reduce the intrinsic insertion loss of dielectric substrate, the air cavity technique is utilized for electromagnetic...
When using multiline TRL calibrations for correcting on-wafer measurements, the accuracy of the result depends crucially on the consistency of the calibration set. For example, each line standard used in the calibration process must allow unambiguous measurements, i.e., the only difference between the various transmission-line elements should be line length. To this end, the pad structure for the...
The smallest wirelessly powered neural implant to date is demonstrated. Power is sent over a near-field inductive link. The implant system is realized on a single CMOS ASIC which includes the on-chip coil, the harvesting circuit, and the current driver. The entire system is fabricated in a 0.13 μm CMOS process and occupies merely 180 μm × 180 μm.
Thickness control data measured at different fabrication stages of atomic force microscopy (AFM) self-sensing cantilevers are presented in this paper. Specifically, the thicknesses of multilayered structures comprising silicon, silicon dioxide and thin patterned layers have been measured in-line during multi-step devices' processing. The data of the electrically detected resonance frequencies of the...
A novel cavity-backed slot antenna, with the ability of reconfiguring the frequency, polarization and radiation pattern, is presented. The reconfigurability is realized by electronically controlling the state of switches between two crossed slots etched on the surfaces of a substrate integrated waveguide (SIW) cavity. The antenna is capable of simultaneously changing the radiation patterns between...
In this work, we present a new microfluidic particle-analyzing device with a spatially coplanar-electrode design. To achieve effective particle analysis, 4 coplanar electrodes were designed and fabricated on glass substrates. Different from traditional cross-channel electrodes in impedance sensing, the coplanar design can be achieved without precise alignment issue, which is the major obstacle of...
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