2,631 Hits in 8.1 sec

Efficient fast-recovery scheme for NMR pulse spectrometers

N.S. Sullivan, P. Deschamps, P. Néel, J.M. Vaissière
1983 Revue de Physique Appliquée  
The use of a high voltage FET as a gated duplexer to isolate the RF transmitter after the pulse is also described.  ...  The circuit damper is especially useful at low frequencies and we have been able to reduce the recovery time of a series resonant circuit (Q = 50) to less than 7 03BCs. at 3 MHz using this feedback scheme  ...  -It is a pleasure to thank Michel Devoret, Daniel Estève and Stanislas Leibler , for many helpful discussions concerning the operation 261 and improvement of pulse NMR spectrometers.  ... 
doi:10.1051/rphysap:01983001804025300 fatcat:5xrhmommzre4rd3gotxubfvceu

The design of a 3-V 900-MHz CMOS bandpass amplifier

Chung-Yu Wu, Shuo-Yuan Hsiao
1997 IEEE Journal of Solid-State Circuits  
When the quality factor is tuned at Q = 30, the measured center frequency of the amplifier is tunable between 869-893 MHz with power gain 17 dB, noise figure 6.0 dB, output 1 dB compression point at 030  ...  In the proposed amplifier, the positive-feedback Q-enhancement technique is used to overcome the low-gain low-Q characteristics of the CMOS tuned amplifier.  ...  They also wish to thank the Chip Implementation Center (CIC) of the National Science Council (NSC), Taiwan, R.O.C. for giving the chance to implement the chip.  ... 
doi:10.1109/4.551907 fatcat:nfwazwiuzrfpxnavsq7zypfcyi

Design and preliminary evaluation of a portable device for the measurement of bioimpedance spectroscopy

Yuxiang Yang, Jue Wang, Gang Yu, Feilong Niu, Ping He
2006 Physiological Measurement  
The results obtained by the device were found to be in good agreement with the results measured by a commercial impedance analyzer HP4194, with an overall mean error of 0.014% in magnitude and 0.136 •  ...  In order to improve the accuracy of the device, a threereference calibration algorithm was applied.  ...  This study was supported by a grant from the National Natural Science Foundation of China (grant no. 60271025) and a grant from the Scientific Research Foundation for the Returned Overseas Chinese Scholars  ... 
doi:10.1088/0967-3334/27/12/004 pmid:17135701 fatcat:o5a5meorijfj3psmwqzbo4pzem

A High Dynamic Range CMOS Variable Gain Amplifier for Mobile DTV Tuner

Jianhong Xiao, Iuri Mehr, Jose Silva-Martinez
2007 IEEE Journal of Solid-State Circuits  
A novel broadband input impedance matching scheme based on resistive shunt-feedback is proposed. This scheme allows the RFVGA to achieve a low noise figure.  ...  A high dynamic range RF variable gain amplifier (RFVGA) suitable for mobile digital television (DTV) tuners is presented.  ...  Another option is to employ an RF variable gain amplifier (RFVGA) with high dynamic range as the first stage of the tuner [3] - [10] .  ... 
doi:10.1109/jssc.2006.889386 fatcat:kyww7kqp3bccnlkpdutit46gsy

Impedance Matching Antenna-Integrated High-Efficiency Energy Harvesting Circuit

Yuharu Shinki, Kyohei Shibata, Mohamed Mansour, Haruichi Kanaya
2017 Sensors  
The measured output DC voltage is 5.67 V for an input of 100 mV at 900 MHz. Antenna input impedance matching is optimized for greater efficiency and miniaturization.  ...  This paper describes the design of a high-efficiency energy harvesting circuit with an integrated antenna.  ...  The RLC series resonant circuit plays a voltage-amplifying circuit role. Namely, the input voltage is amplified by the quality factor (Q value).  ... 
doi:10.3390/s17081763 pmid:28763043 pmcid:PMC5579744 fatcat:edxlgw6ebjhazpxqsr4ps3emri

A 920-MHz Dual-Mode Receiver with Energy Harvesting for UHF RFID Tag and IoT

Peiqing Han, Zhaofeng Zhang, Yajun Xia, Niansong Mei
2020 Electronics  
The reconfigurable architecture of the tag is proposed to be compatible with low-power and high-sensitivity operating modes.  ...  For high-sensitivity mode, the maximum PCE of the fully on-chip energy harvester is 46.5% with over 1-μW output power and the sensitivity is −40 dBm with 880 nW power consumption under the supply voltage  ...  With an input power from −40 dBm to −20 dBm, the amplitude of the output envelope signal is from 10 mV to 100 mV, which cannot meet the needs of the demodulation circuit in the subsequent stage.  ... 
doi:10.3390/electronics9061042 fatcat:yobmblosivao5orcaqlhbunfwq

Analysis of longitudinal beam dynamics behavior and rf system operative limits at high-beam currents in storage rings

T. Mastorides, C. Rivetta, J. D. Fox, D. Van Winkle, D. Teytelman
2008 Physical Review Special Topics. Accelerators and Beams  
These studies have led to the estimation of limits and determining factors in the maximum stored current that the low energy ring/high energy ring (LER/HER) can achieve, based on system stability for different  ...  MV 4 J J Power 3900 5 MV 2 J J Power 3950 5 MV 4 J J >4 A  ...  ACKNOWLEDGMENTS The authors would like to thank the SLAC klystron department for their help with klystron tests and the PEP II operations group for providing us with machine time for measurements.  ... 
doi:10.1103/physrevstab.11.062802 fatcat:tdrzdvdt7zamhakfecvbcd643y

Low-Power 56Gb/s NRZ Microring Modulator Driver in 28nm FDSOI CMOS

Hannes Ramon, Michael Vanhoecke, Jochem Verbist, Wouter Soenen, Peter De Heyn, Yoojin Ban, Marianna Pantouvaki, Joris Van Campenhout, Peter Ossieur, Xin Yin, Johan Bauwelinck
2018 IEEE Photonics Technology Letters  
The driver delivers 1 Vpp to the microring modulator from a 75 mVpp input while only consuming 40 mW (710 fJ/bit at 56 Gb/s).  ...  Transmission experiments up to 2 km of single mode fiber show a bit-error-ratio less than 1 · 10 −9 at 56 Gb/s.  ...  ACKNOWLEDGMENT The authors would like to thank the Optical I/O IAP from imec for the microring modulator, Danny Frederickx for the wire bonding and CMST for the thinning of the optical chip.  ... 
doi:10.1109/lpt.2018.2799004 fatcat:vbaejxxfdbbabfqrojs62tjk3q

Properties of screen printed electrocardiography smartware electrodes investigated in an electro-chemical cell

Linda Rattfält, Fredrik Björefors, David Nilsson, Xin Wang, Petronella Norberg, Per Ask
2013 BioMedical Engineering OnLine  
Implementations with high input impedance are described in [24] and a solution with pre-amplified electrodes is given in [26] .  ...  All electrode configurations show reasonable electrode impedances which, included in an appropriate measurement setup with high input impedance amplifiers, should not be a limiting factor.  ...  PA made the overall study design and contributed to the manuscript. All authors have revised the manuscript and have approved the final manuscript. Submit your next manuscript to BioMed  ... 
doi:10.1186/1475-925x-12-64 pmid:23827015 pmcid:PMC3716966 fatcat:7mvosn223zfexjp4gini6gbywa

Upgrade of the ALICE muon trigger electronics

P Dupieux, B Joly, F Jouve, S Manen, R Vandaële
2014 Journal of Instrumentation  
Second version of ASIC and board A second version called FEERIC-proto2 with a larger gain (1 mV/fC) and improved layout of the ASIC and board was designed.  ...  The input impedance is low, so a resistor must be added in series in the board for impedance matching. With these characteristics, the amplifier stage is functionally a transimpedance amplifier.  ... 
doi:10.1088/1748-0221/9/09/c09013 fatcat:chs7755jffdp5mirkzi5shukei

A low-power reference buffer with high PSRR and low crosstalk for time-interleaved ADCs

Hyeonho Song, Jintae Kim, Minjae Lee
2013 IEICE Electronics Express  
A conventional approach requires enough bandwidth in feedback amplifiers to suppress high frequency supply noise, which tends to increase power consumption.  ...  We propose design techniques to improve the corner frequency of power supply rejection ratio (PSRR) by a factor of 100 and the cross-channel isolation by 20 dB without drawing more current.  ...  The reference buffer generates singleended 300 mV pp input (Vrefo900 mV, VrefoÀ600 mV under 1.5 V supply with the total current of 16.2 mA; 1.5 mA for each OTA, 1.2 mA for the replica stage and 6 mA  ... 
doi:10.1587/elex.10.20130482 fatcat:qgolpjkljrgfndsilqwtqyojiu

A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to g/sub m/-C filters

J.A. De Lima, C. Dualibe
2001 IEEE transactions on circuits and systems - 2, Analog and digital signal processing  
It embeds a feedback loop that holds input devices on triode region while boosting the output resistance.  ...  A linearly tunable low-voltage CMOS transconductor featuring a new adaptative-bias mechanism that considerably improves the stability of the processed-signal common-mode voltage over the tuning range,  ...  ACKNOWLEDGMENT The authors would like to thank E. Silva and A.  ... 
doi:10.1109/82.958335 fatcat:evrcxr5vljg6zjcl7rv35jq7e4

Low-Power 2.4-GHz Transceiver With Passive RX Front-End and 400-mV Supply

Ben W. Cook, Axel Berny, Alyosha Molnar, Steven Lanzisera, Kristofer S. J. Pister
2006 IEEE Journal of Solid-State Circuits  
An analysis of passive mixer input impedance reveals the potential to reject interferers at the mixer input with characteristics similar to an extremely highparallel LC filter centered at the switching  ...  The binary FSK transmitter delivers 300 W to a balanced 50-load with 30% overall efficiency and 45% power amplifier (PA) efficiency.  ...  The voltage gain from to the mixer input node is easily derived from the voltage divider formed with the and .  ... 
doi:10.1109/jssc.2006.884801 fatcat:eih7kth3wrhs7ovzjcfem4s4va

Ka-band time-domain multiplexing front-end with minimum switch area utilization on 22 nm fully depleted silicon-on-insulator CMOS technology

Mikko Hietanen, Jere Rusanen, Janne P. Aikio, Nuutti Tervo, Timo Rahkonen, Aarno Pärssinen
2021 International journal of microwave and wireless technologies  
Respectively, high impedance of off-state PA is assumed to achieve acceptable receive performance. Resulting output power is 13.6 dBm with 15 dB of peak small-signal gain at 28 GHz.  ...  Antenna switch utilizes pre-existing LNA input matching network together embedded with grounded shunt transistor switch to provide sufficient isolation of receive side from PA.  ...  and maximum V ds,DC of 900 mV is used.  ... 
doi:10.1017/s1759078721000428 fatcat:invgl734ufdajjl2qnbygpu3ku

A class AB monolithic mixer for 900-MHz applications

Keng Leong Fong, C.D. Hull, R.G. Meyer
1997 IEEE Journal of Solid-State Circuits  
The design has a power gain of 7.5 dB and operates with supply voltages from 2.7 to 5 V.  ...  A Class AB downconversion mixer for 900-MHz applications is presented. The circuit is implemented in a 25-GHz fT bipolar process and consumes 10.2 mA total current from a 3-V supply.  ...  ACKNOWLEDGMENT The authors would like to thank J. L. Tham, F. Intveld, L. Volt, T. Little, and R. Hlavac from Rockwell for their help with design, layout, and testing.  ... 
doi:10.1109/4.604072 fatcat:umwhokztrnetnhmrfcagnppmay
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