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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

The feasibility of using standard 0.18µm CMOS technology for low cost wideband monolithic microwave integrated circuits (MMICs) at ∼27GHz is demonstrated. Three monolithically integrated distributed voltage controlled oscillators (DVCOs) with a novel gain cell comprising of n-FET common source with p-FET current-source load are designed. Two of the DVCO's have 3 stages of the gain cell while the third has 4 stages. Top Layer metal is used a coplanar waveguide for producing on-chip inductive elements. An important feature of these DVCOs is the use of body bias variation for very large frequency tuning. Simulation results indicate that the 4-stage DVCO achieves a tuning range of 22.43–23.42GHz i.e 990MHz whereas the 3-stage DVCO has a tuning range of 25.82–27.10GHz i.e 1.28GHz, with respectively ∼0.5dBm and ∼1dBm change in output power over tuning range for DVCOs. The best value of phase noise for 3-stage DVCO is obtained by applying reverse body bias on n-FETs. For a reverse body bias voltage of −1V, the phase noise is −97.39dBc/Hz at 1MHz offset from 26.87GHz.

27.1GHz CMOS distributed voltage controlled oscillators with body bias for frequency tuning of 1.28GHz

This paper investigates the effect of loading a Swastika shaped Defected Ground Structure (DGS) on a Hemispherical DRA. The HDRA of e r =9.2, radius r=2.54 cm (1″) resonates at 1.816 GHz with a gain of 6 dBi. The bandwidth of operation (S 11 <−10 dB) of the HDRA is 10% at the resonant frequency. The optimized dimensions, calculated through rigorous parametric sweeps, of the swastika DGS are a=0.54, b=0.59 and c=0.08 cms, as shown in Fig. 1.

A novel hemispherical dielectric resonator antenna with Swastika shaped DGS for high gain applications

A novel, compact, multiple band notch filter (MBNF) is presented Contiguous and concentric split ring resonators (SRRs) and ring resonator are used to achieve desired multiple narrow band notches These band notches have been designed to avoid the undesired interference between co-existing wireless channels Proposed filter is implemented on RT/Duroid 5880 (e r =22) substrate of thickness 0785 mm and surface area of 14 × 14 sq mm Insertion loss of the proposed filter at notch bands is high (>13 dB) and low (<08 dB) elsewhere Measured results are correlated with simulated results and ensure proposed filter is a suitable candidate to mitigate interference caused by the co-existing and emerging wireless technologies

Multiple band notch filter using contiguous split ring resonators (SRR)

A novel, compact and dual polarized ring Sectoral Monopole Antenna (RSMA) with defected ground is presented for Ultra Wide Band (UWB) applications. Present structure has been derived from the circular monopole antenna to accomplish dual polarization characteristics without much change in the impedance band width, radiation pattern (quasi Omni-directional) and other antenna characteristics. Proposed RSMA with partial and defected ground design, UWB response (i.e. 3.1 GHz-10.6 GHz) with reference to VSWR<;2 is achieved. The antenna is fabricated on a RT/Duroid5880 (er =2.2) substrate having thickness of 0.785 mm with total real-estate of 20×28 mm2. Measurements are in close agreement with the simulated results. Dual polarization characteristics ensure that proposed antenna can be a promising candidate for the UWB applications.

Jayanta Mukherjee

Papers

27.1GHz CMOS distributed voltage controlled oscillators with body bias for frequency tuning of 1.28GHz

A novel hemispherical dielectric resonator antenna with Swastika shaped DGS for high gain applications

Multiple band notch filter using contiguous split ring resonators (SRR)

Compact UWB ring sectoral monopole antenna with dual polarization

Symmetric periodic leaky-wave antenna for open stopband suppression