共查询到20条相似文献,搜索用时 15 毫秒
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Hsu-Feng Chou Ramaswamy A. Zibar D. Johansson L.A. Bowers J.E. Rodwell M. Coldren L.A. 《Photonics Technology Letters, IEEE》2007,19(12):940-942
We propose and demonstrate a novel coherent receiver with feedback for high-linearity analog photonic links. In the proposed feedback receiver, a local phase modulator tracks the phase change of the signal and reduces the effective swing across the phase demodulator without reducing the transmitted signal. The signal-to-noise-ratio is thus maintained while linearity is improved. Up to 20-dB improvement in spur-free dynamic range (SFDR) is achieved experimentally. At 3.13 mA of average photocurrent per photodiode, the measured SFDR is 124.3 dBmiddotHz2/3, which corresponds to an SFDR of 131.5 dBmiddotHz2/3 when the link is shot-noise-limited 相似文献
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An active filtering technique to remove the out-of-band blockers in wireless receivers is presented. The circuit employs a feed-forward filtering path to produce an arbitrarily narrow frequency response in the low-noise amplifier (LNA), eliminating the need for an external surface acoustic wave (SAW) filter at the receiver front-end. The required notch filtering in the feed-forward path is realized through a receiver translational loop, driven by the same local oscillator (LO) signals used in the main receiver. For the proof of concept, a prototype amplifier in 65 nm standard CMOS, intended for Global System for Mobile Communication (GSM) applications, is implemented. When the filtering is enabled, the amplifier 3-dB bandwidth reduces from 220 MHz to about 4.5 MHz, and a stop-band rejection of over 21 dB is achieved. 相似文献
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本文设计一款用于探测生理信号SoC芯片中的5GHz双边带上变频器.该混频器基于传统的吉尔伯特单元,采用交流耦合current-bleeding结构以及三阶非线性失真抵消技术抑制非线性.通过将跨导级晶体管偏置在不同的工作区域(transconductance-boost结构),使得带内变频损失小于5dB而IIP3介于22.3dBm到39.8dBm,而且双边带噪声指数小于8.2dB.应用全差分结构和感性源极钝化,再次抑制了二阶以及三阶失真.全部上变频器在1.2V供电条件下总功耗为8.4mW. 相似文献
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Ozalevli E. Hasler P.E. 《IEEE transactions on circuits and systems. I, Regular papers》2008,55(4):999-1010
In this paper, an implementation of a tunable highly linear floating resistor that can be fully integrated in CMOS technology is presented. The second-order effects of a single MOS transistor operating in the triode operation regime are described, and a common-mode linearization technique is applied to suppress these nonlinearities. This technique is implemented by utilizing a low-power circuit design strategy that exploits the capacitive coupling and the charge storage properties of floating-gate transistors. The resistance of the proposed circuit is tuned by utilizing the Fowler-Nordheim tunneling and hot-electron injection quantum-mechanical phenomena. We demonstrate the use of this resistor in highly linear amplifier. We present experimental data from the chips that were fabricated in a 0.5- CMOS process. We show that this resistor exhibits 0.024% total harmonic distortion (THD) for a sine wave with amplitude. Also, we show the programmability of the amplifier gain using the proposed tunable resistor. 相似文献
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设计了一种适于DVB-C标准的中频可变增益放大器。该放大器由三部分构成:电流调节型可变增益单元、基于差分对管传输特性的指数控制电压产生电路以及一高线性输出级。采用Chartered0.25μm RFCMOS工艺库下流片。测试结果表明,4~49dB的连续增益范围,100MHz的3dB带宽,50Ω负载下的OIP3为16.8dBm。 相似文献
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The emergence of wide channel bandwidth wireless standards requires the use of a highly linear, wideband integrated CMOS baseband chain with moderate power consumption. In this paper, we present the design of highly linear, wideband active RC filters and a digitally programmable variable gain amplifier. To achieve a high unity gain bandwidth product with moderate power consumption, the feed‐forward compensation technique is applied for the design of wideband active RC filters. Measured results from a 0.5 µm CMOS prototype baseband chain show a cutoff frequency of 10 MHz, a variable gain range of 33 dB, an in‐band IIP3 of 13 dBV, and an input referred noise of 114 µVrms while dissipating 20 mW from a 3 V supply. 相似文献
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《Microwave and Wireless Components Letters, IEEE》2009,19(12):822-824
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《Microwave and Wireless Components Letters, IEEE》2009,19(2):89-91
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A New Linearization Technique for CMOS RF Mixer Using Third-Order Transconductance Cancellation 总被引:1,自引:0,他引:1
Kung-Hao Liang Chi-Hsein Lin Hong-Yeh Chang Yi-Jen Chan 《Microwave and Wireless Components Letters, IEEE》2008,18(5):350-352
A new third-order transconductance (gm3) cancellation technique is proposed and applied to a conventional radio frequency (RF) mixer for improving circuit linearity. The bulk-to- source voltage is applied to adjust the peak value position of gms. The cancellation of gm3 is utilized by a negative peak gm3 transistor combined in parallel with a positive peak gm3 transistor. For a single device, the measured adjacent channel power ratio (ACPR) and third-order intermodulation (IMD3) distortion are both improved over 15 dB. A Gilbert-cell mixer in commercial 0.18-mum CMOS process was designed using the proposed method to further evaluate the linearity. The compensated gm3 device is placed in the input RF gm-stage and then reducing the principle nonlinearity source of the mixer. From the experiment results, the ACPR and IMD3 of the mixer are improved about 10 and 15 dB, respectively. 相似文献
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A heterodyne receiver performs frequency down-conversion in two steps to relax oscillator and divider speed requirements. The receiver incorporates new concepts such as a current-domain quadrature separation method, a broadband Miller divider based on a passive mixer, and an inductor nesting technique that significantly reduces the length of high-frequency interconnects. Fabricated in 90-nm CMOS technology, the circuit achieves a noise figure of 6.9 to 8.3 dB from 49 GHz to 53 GHz with a gain of 26 to 31.5 dB and I/Q mismatch of 1.6 dB/6.5deg. 相似文献
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《Electron Device Letters, IEEE》2008,29(11):1209-1211
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《Microwave and Wireless Components Letters, IEEE》2008,18(9):617-619
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Jehyung Yoon Huijung Kim Changjoon Park Jinho Yang Hyejeong Song Sekyeong Lee Bumman Kim 《Microwave Theory and Techniques》2008,56(3):626-631
The noise figure of an RF CMOS mixer is strongly affected by flicker noise. The noise figure can be improved using pMOS switch circuits, which insert current at the on/off crossing instants of the local oscillator switch stage because the circuits reduce the flicker noise injection. When it is applied to a conventional Gilbert mixer, the injection efficiency and linearity are degraded by the nonlinear parasitic capacitances of the pMOS switch circuits and the leakage through the parasitic path. We propose the pMOS switch circuits with an inductor, which tunes out the parasitic components at 2fo and closes out the leakage path. The mixer fabricated in 0.13-mum CMOS at 2.4-GHz center frequency has provided improved characteristics for linearity and noise figure. 相似文献
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A. Karpov J. Blondel M. Carter D. Billon-Pierron K. H. Gundlach 《Journal of Infrared, Millimeter and Terahertz Waves》1998,19(9):1175-1190
The integration of many receiver units into a receiver array is a common method of improvement of imaging systems. This approach, well known in the mm band for Schottky mixer arrays, has not so far been developed for Superconductor - Insulator - Superconductor (SIS) junction mixers, which give the best sensitivity in the short mm wave range and in the submm range. We demonstrate for the first time a practical low noise multibeam receiver module using SIS mixer technology. The basis for the integration of several SIS mixers with a common local oscillator source is given by the saturation of the SIS receiver noise dependence upon local oscillator power. The module comprises three identical SIS mixers integrated with a common local oscillator, coupled through a three branch waveguide directional coupler. The multibeam module has been developed for a focal plane array receiver of the 30 meter radio telescope of the Institut de Radioastronomie Millimétrique (IRAM). 相似文献