1,722,074 research outputs found
A Single-Chip K-Band CMOS FMCW Radar Transceiver
No full textThis paper presents a K-band FMCW radar transceiver IC, which is integrated in 0.13-μm CMOS technology. In the transmitter part, the class-C topology is adopted in the VCO block to achieve good phase noise performance. In the receiver part, the high gain of the LNA sufficiently suppresses the noise of the next stages to achieve a good noise figure in the receiver and the linearity of the receiver was improved by adoption of a gain control block, thereby achieving a wide dynamic range. As a result, a conversion gain of 35.7 dB, a P1dB of -12.7 dBm, and a DSB noise figure of 5.5 dB are achieved in the receiver part. The tuning range of 23.8~24.5 GHz and the phase noise of -103.1 dBc/Hz @ 1MHz offset are achieved in the transmitter part. The transceiver chip consumes 181.5 mW from a 1.5 V power supply. Using this chip, the K-band FMCW radar module is implemented and verified by measurement of the distance of an object
A 1.83 GHz 28.5 dBm CMOS Power Up-Mixer
No full textA power up-mixer is proposed in this letter. A merged CMOS linear power amplifier (PA) and mixer allows low current consumption and smaller chip size than a conventional integrated transmitter including a mixer and a CMOS linear PA. The chip is fabricated in a 0.18 mu m CMOS process and in an integrated-passive-device. Measurements show a drain efficiency of 27% at 27.2 dBm of 1 dB compression point (P1dB) output power from 1.75 to 1.95 GHz. Power conversion gain is 26.4 dB and LO leakage is -43 dBc
A 79 GHz g(m)-boosted Sub-Harmonic Mixer with High Conversion Gain in 65nm CMOS
No full textIn this paper, a 79 GHz gm-boosted subharmonic mixer with high conversion gain is presented. As a gm-boosting technique, a transformer based feedback network with an NMOS bleeding path is proposed to achieve high conversion gain. The differential LO-driven subharmonic mixer has a simple structure and operates at low LO power. The measurement results show a conversion gain of 1.6 dB at a LO power of −5 dBm, a noise figure of 13 dB, and a 2LO-to-RF isolation of 38 dB. The power consumption of the sub-harmonic mixer is 12 mW. The circuit was fabricated using 65-nm CMOS technology with a chip area of 0.69×0.45 mm
Millimeter wave UWB pulse radar front-end ICs
No full textThe 26 GHz and 79 GHz UWB frequency bands are used for short-range radar applications for automobile. In this paper, single chip front-end ICs for both frequency bands are presented. The pulsed oscillator at 26 GHz can produce UWB short pulses. It consumes power only during short duty cycles; thus, it allows a power-efficient radar. A stereo radar, which comprises two synchronized radars, is demonstrated with the ICs. Hybrid beam forming techniques based on base-band delay are also demonstrated. The pulsed front-end architecture of the proposed 79 GHz UWB pulse radar is discussed, which is expected to reduce power consumption. The performance of some circuit elements is also reported
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
CMOS LNA with Darlington-pair for UWB systems
No full textA 3-5 GHz ultra-wideband CMOS low-noise amplifier fabricated using 0.18 mu m CMOS process is presented. To achieve wideband characteristics, a two-frequency matching method for input matching is proposed. A cutoff-frequency (f(T)) doubler using Darlington-pair is employed to achieve high gain from 2.4 to 5.4 GHz. The LNA achieves an average gain of 21 dB, input return loss less than -10 dB, and a noise figure of 2.85-4.5 dB at a power consumption of 23 mW The input 1 dB gain compression point (P1 dB) and IIP3 are -22 and -14 dBm at 4 GHz, respectively
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Design and Analysis of 239 GHz CMOS Push-Push Transformer-Based VCO With High Efficiency and Wide Tuning Range
No full textA push-push transformer-based voltage-controlled oscillator (VCO) is proposed and analyzed to achieve high efficiency and a wide tuning range at sub-terahertz (THz) frequencies. Analyses show that the coupling factor of the transformer to obtain high output power (P-OUT) has to be carefully chosen by consideration of gate-to-drain voltage gain as well as matching impedances seen from the drain and to the gate of a VCO transistor at the 2nd harmonic frequency (2f(o)). Analysis also shows that the transformer-based resonator allows a wide tuning range. In addition, it has been shown that the introduction of a parallel inductor to a varactor leads to high P-OUT and low phase noise. The proposed 239 GHz VCO with a 65 nm CMOS process demonstrates the high efficiency of 1.45%, the P-OUT of -4.8 dBm, and the wide tuning range of 12.5% with a supply voltage of 1.2 V
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