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检索条件"机构=VLSI Circuits and Systems Laboratory Department of Electrical and Computer Engineering"

共 143 条记录，以下是71-80 订阅

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Novel ultrafast vertically emitting semiconductor lasers

Novel ultrafast vertically emitting semiconductor lasers

引用

European Conference on Optical Communication (ECOC)

作者： W. P. Pallmann M. Hoffmann V. J. Wittwer B. Rudin P. Kreuter B. Witzigmann M. Golling Y. Barbarin T. Südmeyer U. Keller Department of Physics Ultrafast Laser Physics Laboratory Zurich Switzerland Department of Information Technology and Electrical Engineering Integrated Circuits and Systems Laboratory Zurich Switzerland Department of Electrical Engineering and Computer Science Computer Electrical and Phot. Group University of Kassel Germany

We demonstrate the highest average power of any modelocked semiconductor laser: the optically-pumped MIXSEL generates 6.4-W in 28.1-ps pulses at 2.5-GHz repetition rate. Furthermore, we discuss electrically-pumped VEC... 详细信息

关键词： Laser modes Vertical cavity surface emitting lasers Cavity resonators Numerical models Optical pumping

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A carrier-frequency-independent BPSK demodulator with 100% data-rate-to-carrier-frequency ratio

A carrier-frequency-independent BPSK demodulator with 100% d...

引用

IEEE Biomedical circuits and systems (BIOCAS)

作者： Farzad Asgarian M. Sodagar Amir Integrated Circuits and Systems Laboratory Electrical & Computer Engineering Department K.N. Toosi University of Technology Tehran Iran Electrical & Computer Eng. Dept. University of Technology Tehran Iran Integrated Circuits and Systems Lab. Electrical & Computer Eng. Dept. K. N. Toosi University of Technology Tehran Iran

A novel noncoherent BPSK demodulator is presented for wirelessly-powered biomedical implants. The received data are detected based on rising or falling edge of the digitized carrier, while all components of the circuit are independent of the carrier frequency. Besides simplicity and ultra low-power consumption, the proposed demodulator benefits from an outstanding data-rate-to-carrier-frequency ratio of 100%. Thus, it can easily achieve high data rates with lower carrier frequencies, which is desirable in implantable biomedical applications such as visual prostheses. The circuit is designed and simulated in a 0.18-μm standard CMOS technology and merely consumes 119-μW@1.8 V at a data rate of 10 Mbps. The proposed idea is also supported by experimental results of a proof-of-concept prototype.

关键词： Demodulation Binary phase shift keying Image edge detection Wireless communication Implants Frequency shift keying

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A 2.5 Gpulse/s, 25 pJ/pulse, 0.18 CMOS impulse radio UWB transmitter based on dual-polarity distributed waveform generator

A 2.5 Gpulse/s, 25 pJ/pulse, 0.18 CMOS impulse radio UWB tra...

引用

2009 9th Topical Meeting on Silicon Monolithic Integrated circuits in RF System, SiRF'09

作者： Zhu, Yunliang Hu, Jianyun Wu, Hui Laboratory for Advanced Integrated Circuits and Systems Department of Electrical and Computer Engineering University of Rochester Rochester NY United States

ISBN: (纸本)9781424428311

In this paper, we present a fully-integrated impulse radio UWB transmitter based on a newly-developed ultrafast pulse circuit technique, distributed waveform generator (DWG). A DWG time-interleaves multiple digital pulse generators, and then combines all generated pulses using a wideband on-chip transmission line. A DWG is low power and fully reconfigurable compared to other UWB pulse generation and shaping solutions. It also facilitates the implementation of digital modulation schemes such as on-off keying (OOK) and pulse position modulation (PPM) in the transmitter. A chip prototype with a 10-tap, 10 GS/s dual-polarity DWG was designed and implemented in 0.18m standard digital CMOS. The transmitter's pulse rate can be varied from 16 MHz to 2.5 GHz with an energy efficiency of 25 pJ/pulse. The transmitted pulses with OOK and PPM modulation are successfully demonstrated using 32 Mb/s PRBS data. © 2009 IEEE.

关键词： Amplitude shift keying

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A 0.17-nJ/pulse IR-UWB receiver based on distributed pulse correlator in 0.18-μm digital CMOS

A 0.17-nJ/pulse IR-UWB receiver based on distributed pulse c...

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2009 IEEE Radio Frequency Integrated circuits Symposium, RFIC 2009

作者： Jianyun, Hu Yunliang, Zhu Shang, Wang Hui, Wu Laboratory for Advanced Integrated Circuits and Systems Department of Electrical and Computer Engineering University of Rochester Rochester NY United States Qualcomm Corp. San Diego CA United States

ISBN: (纸本)9781424433780

This paper presents a low power impulse-radio ultra-wideband (IR-UWB) receiver based on a reconfigurable, high speed analog correlator called distributed pulse correlator (DPC). The DPC incorporates built-in local template pulse generation, and hence significantly reduces the power consumption and circuit complexity of the analog correlation receiver. A chip prototype of the IR-UWB receiver was implemented in 0.18-μ m standard digital CMOS, and achieved an energy efficiency of 0.17-nJ/pulse at 250-MHz pulse rate in the measurement. © 2009 IEEE.

关键词： CMOS integrated circuits

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Energy efficient, reconfigurable, distributed pulse generation and detection in UWB impulse radios

Energy efficient, reconfigurable, distributed pulse generati...

引用

IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

作者： Jianyun Hu Yunliang Zhu Shang Wang Hui Wu Laboratory of Advanced Integrated Circuits and Systems Department of Electrical and Computer Engineering University of Rochester Rochester NY USA

Ultrafast pulse generation and detection are pivotal functions in ultra-wideband (UWB) impulse radios. This paper shows that digitally-assisted distributed circuit techniques provide an energy-efficient, reconfigurable solution for both functions, as demonstrated in two new circuits: a pulse generator that can generate reconfigurable pulse waveforms with sub-nanosecond time resolution, and a multi-GHz analog correlator that incorporates reconfigurable local template pulse generation. A UWB impulse radio was developed based on these new circuits with chip prototypes implemented in 0.18-mum standard digital CMOS. It was characterized using UWB antennas, and achieved an energy efficiency of 25-pJ/pulse for the transmitter and 190-pJ/pulse for the receiver at 250 MHz pulse rate in the measurement.

关键词： Energy efficiency Pulse generation Pulse measurements Ultra wideband technology Pulse circuits Energy resolution Correlators Prototypes Standards development CMOS digital integrated circuits

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A 2.5 Gpulse/s, 25 pJ/pulse, 0.18μm CMOS Impulse Radio UWB Transmitter Based on Dual-Polarity Distributed Waveform Generator

A 2.5 Gpulse/s, 25 pJ/pulse, 0.18μm CMOS Impulse Radio UWB ...

引用

Topical Meeting on Silicon Monolithic Integrated circuits in RF systems

作者： Yunliang Zhu Jianyun Hu Hui Wu Laboratory of Advanced Integrated Circuits and Systems Department of Electrical and Computer Engineering University of Rochester Rochester NY USA

In this paper, we present a fully-integrated impulse radio UWB transmitter based on a newly-developed ultrafast pulse circuit technique, distributed waveform generator (DWG). A DWG time-interleaves multiple digital pulse generators, and then combines all generated pulses using a wideband on-chip transmission line. A DWG is low power and fully reconfigurable compared to other UWB pulse generation and shaping solutions. It also facilitates the implementation of digital modulation schemes such as on-off keying (OOK) and pulse position modulation (PPM) in the transmitter. A chip prototype with a 10-tap, 10 GS/s dual-polarity DWG was designed and implemented in 0.18 mum standard digital CMOS. The transmitter's pulse rate can be varied from 16 MHz to 2.5 GHz with an energy efficiency of 25 pj/pulse. The transmitted pulses with OOK and PPM modulation are successfully demonstrated using 32 Mb/s PRBS data.

关键词： Radio transmitters Signal generators Pulse modulation Pulse generation Digital modulation Pulse circuits Wideband Power transmission lines Distributed parameter circuits Prototypes

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Feedforward technique for offset cancellation in broadband differential amplifiers

Feedforward technique for offset cancellation in broadband d...

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International Symposium on Integrated circuits (ISIC)

作者： Duy-Dong Pham James Brinkhoff Kai Kang Chyuen-Wei Ang Fujiang Lin Chun-Huat Heng Integrated Circuits and Systems Laboratory Agency for Science Technology and Research Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore

This paper presents a new feedforward offset cancellation technique for broadband amplifiers which are used in high speed communication systems. Unlike other conventional techniques, such as feedback cancellation or AC coupling, the proposed technique eliminates the need for larger area passive components and avoids the potential stability issue by eliminating the feedback path. Implementing in 90 nm CMOS, the broadband amplifier achieves 52.3 dB gain and 2.7 GHz 3-dB bandwidth with more than 50 dB DC offset rejection.

关键词： Differential amplifiers Broadband amplifiers Pulse amplifiers Stability Capacitance Coupling circuits Low pass filters Detectors Output feedback High speed integrated circuits

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A low-power noncoherent BPSK demodulator and clock recovery circuit for high-data-rate biomedical applications

A low-power noncoherent BPSK demodulator and clock recovery ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Farzad Asgarian Amir M. Sodagar Integrated Circuits and Systems Laboratory Electrical & Computer Engineering Department K.N. Toosi University of Technology Tehran Iran Center of Wireless Integrated Microsystems (WIMS) University of Michigan Ann Arbor USA

A novel noncoherent BPSK demodulator is presented for inductively powered biomedical devices. Differential Manchester encoding technique is used and data demodulation is based on pulse width measurement method. In addition to ultra low power consumption, high data rate without increasing the carrier frequency is achieved with the outstanding data-rate-to-carrier-frequency ratio of 100%. The proposed demodulator is especially appropriate for biomedical applications where high speed data transfer is required, e.g., cochlear implants and visual prostheses. The circuit is designed in a 0.18-mum standard CMOS technology and consumes as low as 232 muW @1.8 V at a data rate of 10 Mbps.

关键词： Binary phase shift keying Demodulation Clocks circuits Pulse measurements CMOS technology Encoding Space vector pulse width modulation Biomedical measurements Energy consumption

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An Ultra-Wideband Resistive-Feedback Low-Noise Amplifier with Noise Cancellation in 0.18μm Digital CMOS

An Ultra-Wideband Resistive-Feedback Low-Noise Amplifier wit...

引用

Topical Meeting on Silicon Monolithic Integrated circuits in RF systems

作者： Jianyun Hu Yunliang Zhu Hui Wu Laboratory for Advanced Integrated Circuits and Systems Department of Electrical and Computer Engineering University of Rochester USA

We present a wideband resistive feedback CMOS low-noise amplifier (LNA) with noise cancellation technique for ultra-wideband applications. The LNA achieves a 3-dB bandwidth of 0.7-6.5 GHz, power gain of 12.5 dB, and noise figure of 3.5-4.2 dB within the 3-dB bandwidth. The input matching is better than -11 dB from 0.7 to 12 GHz. The IIP3 is measured -5 dBm at 5 GHz. It is implemented in a 0.18 mum standard digital CMOS technology, occupies an area of 0.78 mmtimes0.68 mm, and consumes 11.1 mW from a 1.8 V supply.

关键词： Ultra wideband technology Low-noise amplifiers Noise cancellation Impedance matching Bandwidth Broadband amplifiers Voltage Noise measurement Frequency Phase noise

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A design methodology for miniaturized 3-dB branch-line hybrid couplers using distributed capacitors printed in the inner area

A design methodology for miniaturized 3-dB branch-line hybri...

引用

作者： Jung, Sung-Chan Negra, Renato Ghannouchi, Fadhel M. Microwave Circuits and Systems Laboratory School of Information and Communication Engineering Sungkyunkwan University Suwon 440-746 Korea Republic of Mixed Signal CMOS Circuits Group RWTH Aachen University Aachen 52056 Germany IRadio Laboratory Electrical and Computer Engineering Department University of Calgary Calgary AB T2N 1N4 Canada

This paper proposes a methodology to design and optimize the footprint of miniaturized 3-dB branch-line hybrid couplers, which consists of high-impedance transmission lines and distributed capacitors. To minimize the physical size of the coupler, the distributed capacitors are placed within the empty space of the hybrid. The proposed design methodology calls for the joint optimization of the length of the reduced high-impedance transmission lines and the area of the distributed capacitors. A prototype at S-band was designed and built to validate the approach. It showed a size reduction by 62% compared with the conventional 3-dB branch-line hybrid coupler while providing similar performance and bandwidth. © 2006 IEEE.

关键词： Electric lines

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