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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

In this paper, a novel investigation of a Hemispherical Dielectric Resonator Antenna (HDRA) loaded with a Photonic Band Gap (PBG) structure is carried out. The HDRA is designed of material of permittivity e r =9.2 and is resonant at 1.816 GHz offering 10.4% impedance bandwidth and a peak gain of 6 dBi. The PBG designed from a dielectric of e r =9.8, is arranged in a square lattice and offers a band gap from 1.6 GHz to 1. 95 GHz. The effect of the PBG loaded on HDRA reveals that the bandwidth is increased for TE 111 mode to 38% at 1.78 GHz offering a peak gain of 8.05 dBi. The efficiency is above 90% for the entire bandwidth of operation.

Hemispherical Dielectric Resonator Antenna loaded with a Photonic Band Gap structure for wideband and high gain applications

Designing of an Asymmetric RF Oscillator for improved Signal Integrity, using Design of Experiments is presented and Taguchi Orthogonal Array is used for the same. Dependence of various physical parameters on output quality parameters that are Eye Height and Jitter, are shown by curves. Jitter is reduced and Eye Height is increased and as outcome of both, Eye SNR is increased. All in all, Designing of an Asymmetric Oscillator for better Signal Integrity is shown using Design of Experiments.

Designing Asymmetric 2.4 GHz RF Oscillator for improving Signal Integrity by Design of Experiments

This paper presents a band-notched UWB (Ultra Wide Band) Microstrip fed monopole antenna. The band-notch of 5.1 – 5.8 GHz (VSWR > 2) is easily achieved by inserting dual reverse split ring slots in the radiating monopole of the antenna. By properly adjusting the dimensions of the inserted slot, the proposed antenna revealed good UWB performance i.e. impedance bandwidth of 3 – 10 GHz with VSWR &#60; 2, accompanied by a band-rejection function (5.1 – 5.8 GHz) in order to avoid interference caused from the IEEE 802.11a band. Time domain response shows that the proposed structure exhibits a minimal and constant group delay (except for notch band) as needed for UWB application. The antenna is fabricated using FR4 (e r = 4.4) substrate having dielectric thickness of 1.59 mm with total size of 30×20mm.

Printed band - notched u shaped ultra wide band antenna with modified split ring resonator

This article proposes a low cost, high gain and wideband Fabry-Perot Cavity antenna with circular array of square parasitic patches on a superstrate layer. The antenna structure consists of a microstrip antenna, which feeds circular array of 18 square parasitic patches fabricated on a low cost FR4 superstrate. The patches are at the bottom of superstrate and suspended in air at 0.5λ 0 height. The structure provides gain of 16.5 dBi with 3 dB gain bandwidth of 14.6% and impedance bandwidth of 13.5%, which covers 5.15–5.875 GHz ISM band. Radiation patterns are nearly stable over the entire frequency band. The antenna provides more than 85% antenna efficiency, Side Lobe Level (SSL) less than −20 dB and Front to Back lobe ratio (F/B) of 20 dB with cross polarization less than −18 dB. The measured VSWR is less than 2 over the frequency band of interest. The proposed antenna is an attractive solution for several wireless communication systems.

Efficient high gain wideband antenna with circular array of square parasitic patches

The feasibility of using standard 0.18μm CMOS technology for low cost wideband monolithic microwave integrated circuits (MMICs) at ~20GHz is demonstrated. Two monolithically integrated distributed oscillators with n-FET gain cells are designed having four and three stages respectively, Coplanar waveguides used as the on-chip inductive elements. MOS Varactors are employed to tune the frequency, a new study for distributed VCOs. Simulated results indicate that the 4-stage D-VCO is oscillating at 20.02GHz and tuned up to 20.23GHz (tuning of 210MHz) where as the frequency of the 3-stage D-VCO is 20.46GHz and tuned up to 21.03GHz (tuning of 570MHz). The change in output power level with tuning is ∼1.5dBm in 4-stage and ∼2dBm in 3-stage designs. These D-VCOs are also compared with measured results of previously reported D-VCOs.

Jayanta Mukherjee

Papers

Hemispherical Dielectric Resonator Antenna loaded with a Photonic Band Gap structure for wideband and high gain applications

Designing Asymmetric 2.4 GHz RF Oscillator for improving Signal Integrity by Design of Experiments

Printed band - notched u shaped ultra wide band antenna with modified split ring resonator

Efficient high gain wideband antenna with circular array of square parasitic patches

20GHz CMOS distributed voltage controlled oscillators with frequency tuning by MOS varactors