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The 5G wireless revolution will bring some fundamental changes on the design of handsets and communication infrastructures, delivering over 10 Gbps download speed with unprecedented densely connected wireless devices. The 5G RF transmitters using phased-array MIMO (multiple-input and multiple-output) antennas will demand excellent power efficiency with high integration and linearity at the cm-Wave/mm-Wave...
This paper presents a review of the recent advances in Lithium Niobate (LiNbOa) micro-electro-mechanical systems (MEMS). Several types of devices and subsystems, including resonators, transformers, filters, and delay lines are discussed, targeting the different functions that are currently sought after in radio frequency signal processing for various existing and emerging applications. Technical challenges...
Far field radio frequency (RF) harvesting technique have become popular method to power wireless sensor network (WSN) recently. However, due to the low efficiency of RF energy harvester, RF powered WSN is unable to perform dynamic network allocation. Accordingly, the functionality of WSN is limited. This paper presents a practical RF powered wireless sensor node design that could dynamic join the...
Intravascular ultrasonic (IVUS) imaging catheters currently use ceramic piezoelectric transducers to form radial images of blood vessel walls. Further improvements in image quality may be enabled through Capacitive and Piezoelectric Micromachined Ultrasonic Transducers (CMUTs and PMUTs). Polymer PMUTs offer many benefits in imaging quality, however, the low acoustic sensitivity and high electrical...
This paper proposes a highly sensitive RF-to-DC power converter with an extended dynamic range that is designed to operate at the medical band 433 MHz and simulated using 0.18 μm CMOS technology. Compared to the conventional fully cross-coupled rectifier, the proposed design offers 3.2× the dynamic range. It is also highly sensitive and requires −18 dBm of input power to produce a 1 V-output voltage...
GaN will play a strong role in advanced RF and microwave applications including 5G and satellite communications. The specifications of these systems will push next-gen GaN devices towards mm-wave operation. The challenges and opportunities for commercial deployment of GaN are identified and a variety of circuit designs are presented. A 5G high-linearity power amplifier MMIC in 0.20um GaN with Pout=36dBm...
This work presents a hybrid and highly adaptive phase locked loop (PLL) system for spin torque oscillators (STO) which are candidates for the next technological implementation of microwave applications. PLL operation is successfully demonstrated in the lower ultra high frequency (UHF) band using a vortex based STO revealing an in-band phase noise of less than −80 dBc/Hz and PLL bandwidth of 2.5 MHz...
In this paper, a new broadband low noise amplifier (LNA) is proposed. The LNA utilizes a composite NMOS/PMOS cross-coupled transistor pair and a difference amplifier to in-crease the linearity while reducing the noise figure. The introduced approach provides partial cancellation of distortion and noise generated by the input transistors, hence, degrading the overall distortion. The LNA is implemented...
This paper reviews our portable multi-dimensional nuclear magnetic resonance (NMR) spectroscopy system combining a 4-mm2 CMOS NMR spectrometer integrated circuit (IC) and a permanent magnet. The work was first reported in [1] with emphases on overall system development and spectroscopy experimentations. Here we pay more attention to the IC design. The scalability of the integrated spectrometer can...
Non-squinting wideband analog multi-beamformer is proposed using true time delay (TTD) element delay Vandermonde matrix (DVM). Efficient realization of the DVM is achieved by sparse factorization, which leads to low-complexity hardware implementations (i.e. less number of delay blocks). It is shown that the proposed approach saves 36 TTD elements in a 5-beam multi-beamformer (4-beams corresponding...
This work presents the design of a high-bandwidth and high slew rate class-AB amplifier in a linear assisted hybrid converter for envelope tracking (ET) applications. ET has become prevalent for improving the efficiency of RF power amplifiers (PA) in portable devices when transmitting LTE signals. The class-AB amplifier in the hybrid converter provides the AC power to the PA, whereas the DC power...
This paper presents the design of a wireless and batteryless heart rate monitor. The measurement is done using a single-lead ECG raw signal. The design is based on a commercial ultra low power microcontroller, an optimized full-custom RF Front-End, a ultra low power Threshold Comparator and a Programmable Gain Amplifier implemented in commercial 90 nm CMOS. The communications are compliant with the...
This paper presents an overview of the design considerations and challenges of event-driven wakeup receivers as well as an analysis of state-of-the-art (SOA) research. We consider advantages and disadvantages of the commonly utilized architectures in these systems as well as presenting big picture perspectives from an application standpoint. This paper focuses on event-driven scenarios where the activity...
A fully integrated low-power 2.4GHz ZigBee transceiver with inductor-less RF front-end implemented in 180nm CMOS technology is demonstrated. The proposed double push-pull LNA collaborates with a current-mode down-converter to provide wideband low-noise reception, as well as the out-of-band blocker resilience. A sliding frequency synthesizer (FS) with low-frequency running VCO is employed to provide...
This paper presents a new approach to approximate various complex arithmetic functions for applications in wideband RF transceivers by using stochastic computing based on the piecewise linear (PWL) approximation. The optimized design parameters for PWL approximation are chosen by an optimization algorithm targeting the best tradeoff between hardware complexity and approximation accuracy. Then, this...
Spin transfer torque oscillators (STOs) based on magnetic tunnel junction (MTJ) devices are emerging as a possible replacement for complementary metal-oxide semiconductors for radio-frequency (RF) signal generation. Advantages include low power consumption, small device area, and large frequency tunability. But such a single device cannot achieve the necessary noise performance for RF applications...
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