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Design Of Analog Cmos Integrated Circuits

In general, Micropower Impulse Radar (MIR) depends on Ultra-Wideband (UWB) transmission systems. UWB technology can supply innovative new systems and products that have an obvious value for radar and communications uses. Important applications include bridge-deck inspection systems, ground penetrating radar, mine detection, and precise distance resolution for such things as liquid level measurement. Most of these UWB inspection and measurement methods have some unique qualities, which need to be pursued. Therefore, in considering changes to Part 15 the FCC needs to take into account the unique features of UWB technology. MIR is applicable to two general types of UWB systems: radar systems and communications systems. Currently LLNL and its licensees are focusing on radar or radar type systems. LLNL is evaluating MIR for specialized communication systems. MIR is a relatively low power technology. Therefore, MIR systems seem to have a low potential for causing harmful interference to other users of the spectrum since the transmitted signal is spread over a wide bandwidth, which results in a relatively low spectral power density.

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Response to FCC 98-208 notice of inquiry in the matter of revision of part 15 of the commission's rules regarding ultra-wideband transmission systems

Resonance conditions for a substrate-superstrate printed antenna geometry which allow for large antenna gain are presented. Asymptotic formulas for gain, beamwidth, and bandwidth are given, and the bandwidth limitation of the method is discussed. The method is extended to produce narrow patterns about the horizon, and directive patterns at two different angles.

Gain enhancement methods for printed circuit antennas

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Design Of Integrated Circuits For Optical Communications

This expanded and thoroughly revised edition of Thomas H. Lee's acclaimed guide to the design of gigahertz RF integrated circuits features a completely new chapter on the principles of wireless systems. The chapters on low-noise amplifiers, oscillators and phase noise have been significantly expanded as well. The chapter on architectures now contains several examples of complete chip designs that bring together all the various theoretical and practical elements involved in producing a prototype chip. First Edition Hb (1998): 0-521-63061-4 First Edition Pb (1998); 0-521-63922-0

The Design of CMOS Radio-Frequency Integrated Circuits: RF CIRCUITS THROUGH THE AGES

This article highlights the effect of superstrate height on gain of MSA fed Fabry Perot Cavity (FPC) antenna. The FPC antenna structure consists of a microstrip antenna, which feeds an array of square parasitic metal patches fabricated on a FR4 superstrate. These patches are good reflector of microwave frequency and therefore are used to enhance the reflection coefficient and the gain. Field amplitude and phase depend on dimensions and spacing between parasitic patches. Antenna gain can be further increased by increasing the superstrate height. However, differential gain improvement decreases with superstrate height. High gain is achieved by placing superstrate layer at about integral multiple of half wavelength above the ground plane. Structures are designed, fabricated and tested. Measured VSWR is less than 2 over 5.725–5.875 GHz, ISM band. The analysed structures can be packaged inside an application platform.

Effect of superstrate height on gain of MSA fed Fabry Perot Cavity antenna

In this paper high gain parallel metal plated circular monopole UWB antenna with a planar reflector is proposed. The antenna is fabricated using 0.5 mm thick copper plate. Reflector of 50 mm × 60 mm is placed 10 mm below the antenna structure. VSWR = 2 and gain variation of 7.5-10.2 dBi are obtained over 4.1-10.6 GHz. The antenna offers unidirectional radiation patterns in both the planes with cross polarization 15 dB. The antenna offers nearly constant group delay. The structure is fabricated and tested. Measured results agree with simulation results.

Parallel metal plated high gain ultra wideband antenna with unidirectional radiation pattern

A novel uniplanar electromagnetic band-gap structure to maintain power integrity by suppressing simultaneous switching noise (SSN) is presented. The EBG structure with stopband from 750 MHz to 5.10 GHz is designed, fabricated and validated using network analyzer. Simulation results are verified by measurements and compared with the earlier published structures. Suppression of resonant cavity modes of power plane by EBG structure is also shown. The adoption of EBG structure in power deliver network is recommended to reduce the high frequency noise coupling between neighboring devices. These structures further help in better EMI/EMC compliance of the product by attenuating the propagation of high frequency noise between devices. The EBG structure usage can be on board, package or at die level.

A novel EBG structure with super-wideband suppression of simultaneous switching noise in high speed circuits

A two element closely spaced microstrip MIMO antenna with improved isolation characteristics is proposed. An inverted fork-shaped decoupling (IFSD) structure is placed between two closely spaced radiating elements, having. edge-to-edge spacing. Further, a rectangular slot is designed on each radiating element to fill the null in the antenna broadside radiation pattern. The isolation ($S_{\mathbf{21}} and S_{\mathbf{12}}$) of more than 20 dB at 5.5 GHz is achieved using the proposed technique. Antenna elements provide a very good impedance matching ($S_{\mathbf{11}} \lt-15$ dB) at 5.5 GHz. Implementation of IFSD structure and slot provide enhanced isolation of 65.39% compared to MIMO system without proposed technique. The proposed MIMO antenna structure having effective dimensions of. $0.86 \lambda_{0} \times 0.64 \lambda_{0}$.is simple to design and low in cost. The total-active-reflection- coefficient (TARC) and envelope-correlation-coefficient (ECC) of the antenna are below 0.3 and 0.005 respectively. The proposed structure is fabricated and measured.

Isolation Enhancement of Closely Spaced MIMO System Using Inverted Fork Shaped Decoupling Structure

Power Integrity problem for a high speed power plane is discussed in context of selection and placement of decoupling capacitors. The s-parameters data of power plane geometry and capacitors are used for the accurate analysis including bulk capacitors and VRM, for a real world problem. The optimal capacitors and their optimum locations on the board are found using particle swarm optimization. A novel and accurate methodology is presented which can be used for any high speed Power delivery Network.

Jayanta Mukherjee

Papers

Effect of superstrate height on gain of MSA fed Fabry Perot Cavity antenna

Parallel metal plated high gain ultra wideband antenna with unidirectional radiation pattern

A novel EBG structure with super-wideband suppression of simultaneous switching noise in high speed circuits

Isolation Enhancement of Closely Spaced MIMO System Using Inverted Fork Shaped Decoupling Structure

Power Integrity analysis and discrete optimization of decoupling capacitors on high speed power planes by particle swarm optimization