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This paper presents the development of focused single element ultrasound transducers for photoacoustics. Two transducer technologies using 36° rotated Y-cut LiNbO3 have been implemented and compared, namely a LiNbO3 crystal bonded to a glass lens and a shaped piezo-composite. The 50MHz transducer design with an acceptance angle greater than 60° has been optimized by analytical and finite element simulation...
A 28nm CMOS 1.2GHz full-duplex analog front end (AFE) is presented. The AFE can deliver 20Gbps of aggregate service across 50m of RG6 coax. The on-chip line driver, powered from a 7.2V supply and using core transistors, delivers 5.9Vptp differential to the line through the hybrid. A tunable capacitive hybrid circuit for full duplex operation is proposed for low noise performance and allows channel...
A modified dipole form of the PICA (planar inverted cone antenna) is presented for EMC measurements in this communication. By simply getting the whole structure halved, a further step towards miniaturization has been taken. The half-cut antenna shows over a decade impedance bandwidth while offering a 50% reduction in the size compared to the full version and having stable directional radiation pattern...
The design of an electrical impedance spectroscopy acquisition and processing system using a 0.13 μm CMOS technology with a 1kHz to 10 GHz functional frequency range is presented. The system is based on a quadrature modulator in a lock-in architecture. The design of each one of the modules of the system is explained, and post-layout simulations are used to validate the main features of the design...
In this paper a low power, high gain self bias opamp suitable for biomedical applications has been described. A novel trans conductance boosting technique is introduced without having any additional power consumption. A simple technique of biasing the opamp has been introduced for very low offset and without having any requirement for external reference circuit. A prototype of two stage amplifier...
This paper proposes a lag-lead Active Voltage Positioning (AVP) technique that can be used in buck converters to minimize their output voltage transients during dynamic events, such as load pulses. The proposed technique is based on optimizing the output impedance of the converter across a wide range of frequencies, and therefore, output voltage transients in response to both narrow and wide load...
The ever-increasing need for higher number of neural recording channels along with the stringent power and area requirements of a brain-implantable device, demand for ultra-compact and scalable channel architectures. In this paper, we will first briefly discuss the fundamental scaling issues of conventional AC- and DC-coupled neural front-ends. Next, we will analytically examine the feasibility of...
This paper presents an interesting feature of the resonant slotted-waveguide antenna array: the difference pattern at off-center frequencies. Our demonstration uses a 12-element center-fed resonant slot array on rectangular waveguide. The simulation results show that the array produces a sum beam pattern at center frequency, and difference beam patterns at two off-center frequencies (around ±8%)....
In this paper, a coplanar waveguide (CPW) fed wide bandwidth T-shaped slot antenna with dual band-notched characteristics is proposed for Ultra-wideband (UWB) applications. The dual band-notches in WIMAX(3.3–3.7GHz) and WLAN(5.15–5.825GHz) applications have been realized by etching an inverted U-slot resonator inside open circuited feeding stub as well as symmetrically placed a pair of straight slit...
As the Internet of Things (IoT) continues to expand to include applications including home automation, fitness, video, and tracking as well as traditional embedded electronics use cases the needs for testing and optimizing these designs become clearer. Even as IoT expands, the test requirements have begun to crystallize into a set of capabilities that can assist a design team in achieving their goals...
A two-stage low-noise amplifier (LNA), designed using GlobalFoundries' 130 nm SiGe BiCMOS process technology for 56–64 GHz applications is presented in this paper. The LNA consists of two cascode stages, with inductive degeneration using short stub transmission lines with a quarter wavelength. The input matching and output matching adopt T-section matching to ensure optimal noise and input matching,...
For mounting antennas on a thin (ka∼0.5) cylindrical platform, new designs are required. In this paper, a conformal Planar Inverted-F Antenna (PIFA) for mounting on such a cylinder is presented. The PIFA configuration is low cost and easily fabricated. Simulations indicate a −10dB impedance bandwidth of 16%. This new design is a good candidate for antennas for wireless communications and navigation...
This paper presents a broadband Doherty power amplifier (DPA) design with two continuous Class-F-1 matching circuit eliminating offset line in carrier way to increase the bandwidth and efficiency. By employing this compact and highly efficient design method, a DPA working at 2.0 GHz∼2.6 GHz is designed and implemented for verification. With continuous wave (CW) measurements, the experimental results...
A new Ultra-Wideband Antenna with notched band performance for WiMAX is proposed. The antenna has an extended impedance bandwidth from 3 up to 12GHz (120%). The band-notched can be controlled by adjusting the length of the rectangle slot. In order to obtain Omni-directional wide bandwidth antenna with uniform radiation pattern, rounded corners ground plane with two L-shaped slots are utilized to the...
In this study, a wideband terahertz antenna for indoor wireless communication systems is proposed. Antenna has high input impedance which is reasonable for terahertz systems due to the high output impedance of terahertz sources. Proposed antenna has been designed to operate in 0.67 THz which is one of the appropriate frequencies considering the atmospheric attenuation conditions for short range indoor...
Terahertz (THz) wave frequency region is part of the electromagnetic spectrum. This spectrum is located between 0.3 THz to 10 THz or between radio waves and optics. The THz frequency region has potentials in many different applications, such as imaging, spectroscopy, and wireless communication. However, some problems are still remaining and should be solved to develop THz technology system for an...
A model is developed for frequency-dependent response of compact high-speed thin-film lithium-niobate-on-silicon electrooptic modulators. The model predicts potential for > 100 GHz modulation bandwidth.
Phase locked loop (PLL) and Park transformation largely affects the stability of a grid-inverter system. Impedance-based approach is employed to analyze the effect of PLL to stability in this paper. Self-admittance and accompanying admittances are set up to represent the inverter including the PLL effect, and Nyquist criterion is employed to analyze the system stability. An asymmetric current control...
This paper presents a new CMOS realization of voltage differencing buffered amplifier (VDBA). The input stage of VDBA is resistively compensated and output stage is a super source follower (SSF). The resistive compensation enhances gain bandwidth product (GBW) and buffer stage improves phase margin and linearity of the active element. The performance of the proposed block has been verified by using...
This paper presents the novel concept of the fully differential operational floating conveyor (FD-OFC) for the first time, to the best of the authors knowledge. A CMOS design for the proposed FD-OFC is introduced as an 8 (4x4) port general purpose analog building block. The proposed design has the advantage of low power consumption as it can operate under biasing conditions of only 1.5 V, while its...
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