Before the emergence of ultra-wideband (UWB) radios, widely used wireless communications were based on sinusoidal carriers, and impulse technologies were employed only in specific applications (e.g. radar). In 2002, the Federal Communication Commission (FCC) allowed unlicensed operation between 3.1–10.6 GHz for UWB communication, using a wideband signal format with a low EIRP level (−41.3dBm/MHz). UWB communication systems then emerged as an alternative to narrowband systems and significant effort in this area has been invested at the regulatory, commercial, and research levels.

IEEE Transactions on Microwave Theory and Techniques and Antennas and Propagation Announce a Joint Special Issue on Ultra-Wideband (UWB) Technology

Reactive matching is extended to wide bandwidths using the impedance property of LC-ladder filters. In this paper, we present a systematic method to design wideband low-noise amplifiers. An SiGe amplifier with on-chip matching network spanning 3-10 GHz delivers 21-dB peak gain, 2.5-dB noise figure, and -1-dBm input IP3 at 5 GHz, with a 10-mA bias current.

A 3-10-Ghz low-noise amplifier with wideband LC-ladder matching network

PhysioBank是一个大型的逐渐扩增的生理学信号和相关数据的数字化记录文档。目前包含多参数的心肺、神经和其他生物医学信号，尤以心电图（ECG）为主。信号来自健康受试者和各种疾病的患者。涉及的疾病包括心脏猝死、充血性心力衰竭、癫痫、步态不稳、睡眠呼吸暂停和衰老等。

PhysioBank

A unified algorithm for elementary functions

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Medical Instrumentation Application And Design

A low drop-out (LDO) regulator with a feed-forward ripple cancellation (FFRC) technique is proposed in this paper. The FFRC-LDO achieves a high power-supply rejection (PSR) over a wide frequency range. Complete analysis and design steps of the FFRC-LDO are presented in this paper. Kelvin connection is also used to increase the gain-bandwidth of the LDO allowing for faster transient performance. The LDO is implemented in 0.13 ?m CMOS technology and achieves a PSR better than - 56 dB up to 10 MHz for load currents up to 25 mA. Load regulation of 1.2 mV for a 25 mA step is measured, and the whole LDO consumes a quiescent current of 50 ?A with a bandgap reference circuit included. To our knowledge, this is the first LDO that achieves such a high PSR up to 10 MHz.

High PSR Low Drop-Out Regulator With Feed-Forward Ripple Cancellation Technique

A typical data acquisition system takes periodic samples of a signal, image, or other data, often at the so-called Nyquist/Shannon sampling rate of two times the data bandwidth in order to ensure that no information is lost. In applications involving wideband signals, the Nyquist/Shannon sampling rate is very high, even though the signals may have a simple underlying structure. Recent developments in mathematics and signal processing have uncovered a solution to this Nyquist/Shannon sampling rate bottlenck for signals that are sparse or compressible in some representation. We demonstrate and reduce to practice methods to extract information directly from an analog or digital signal based on altering our notion of sampling to replace uniform time samples with more general linear functionals. One embodiment of our invention is a low-rate analog-to-information converter that can replace the high-rate analog-to-digital converter in certain applications involving wideband signals. Another embodiment is an encoding scheme for wideband discrete-time signals that condenses their information content.

Method and apparatus for on-line compressed sensing

Demand for system-on-chip solutions has increased the interest in low drop-out (LDO) voltage regulators which do not require a bulky off-chip capacitor to achieve stability, also called capacitor-less LDO (CL-LDO) regulators. Several architectures have been proposed; however comparing these reported architectures proves difficult, as each has a distinct process technology and specifications. This paper compares CL-LDOs in a unified matter. We designed, fabricated, and tested five illustrative CL-LDO regulator topologies under common design conditions using 0.6?m CMOS technology. We compare the architectures in terms of (1) line/load regulation, (2) power supply rejection, (3) line/load transient, (4) total on-chip compensation capacitance, (5) noise, and (6) quiescent power consumption. Insights on what optimal topology to choose to meet particular LDO specifications are provided.

Low Drop-Out Voltage Regulators: Capacitor-less Architecture Comparison

A reconfigurable low-noise amplifier (LNA) with tunable input matching network is proposed. The tunable input matching network provides continuous tuning of the input resonant circuit. The LNA is implemented using 0.13-mum CMOS technology. The amplifier has a tuning range of 1.9-2.4 GHz with an input return loss better than -13 dB. The LNA has a measured voltage gain of 10-14 dB and a noise figure of 3.2-3.7 dB within the band. The LNA consumes 14 mA from a 1.2-V supply. The detailed analysis of the proposed LNA, including the tuning range and additional noise of the proposed reconfigurable input matching network, is presented. To our knowledge, this is the first architecture that provides continuous tuning of the input matching network.

A CMOS Low-Noise Amplifier With Reconfigurable Input Matching Network

A new broadband low-noise amplifier (LNA) is proposed in this paper. The LNA utilizes a composite NMOS/PMOS cross-coupled transistor pair to increase the amplification while reducing the noise figure. The introduced approach provides partial cancellation of noise generated by the input transistors, hence, lowering the overall noise figure. Theory, simulation and measurement results are shown in the paper. An implemented prototype using IBM 90 nm CMOS technology is evaluated using on-wafer probing and packaging. Measurements show a conversion gain of 21 dB across 2-2300 MHz frequency range, an IIP3 of -1.5 dBm at 100 MHz, and minimum and maximum noise figure of 1.4 dB and 1.7 dB from 100 MHz to 2.3 GHz for the on-wafer prototype. The LNA consumes 18 mW from 1.8 V supply and occupies an area of 0.06 mm2.

Mohamed El-Nozahi

Papers

High PSR Low Drop-Out Regulator With Feed-Forward Ripple Cancellation Technique

Method and apparatus for on-line compressed sensing

Low Drop-Out Voltage Regulators: Capacitor-less Architecture Comparison

A CMOS Low-Noise Amplifier With Reconfigurable Input Matching Network

An Inductor-Less Noise-Cancelling Broadband Low Noise Amplifier With Composite Transistor Pair in 90 nm CMOS Technology