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楔块调整式Talbot干涉仪改变写入Bragg波长的调谐误差 被引量:1
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作者 李川 张以谟 +2 位作者 田学飞 刘铁根 吴晟 《光学技术》 CAS CSCD 2004年第1期80-82,共3页
在楔块调整式Talbot干涉仪中,光纤Bragg光栅的写入区为直接由相位模板衍射的±1级衍射光束形成的干涉条纹的近场干涉区,和由±1级衍射光束经两平面镜反射后形成的可调谐写入Bragg波长的干涉条纹的远场干涉区。在改变写入光纤光... 在楔块调整式Talbot干涉仪中,光纤Bragg光栅的写入区为直接由相位模板衍射的±1级衍射光束形成的干涉条纹的近场干涉区,和由±1级衍射光束经两平面镜反射后形成的可调谐写入Bragg波长的干涉条纹的远场干涉区。在改变写入光纤光栅Bragg波长的过程中,光纤光栅的Bragg波长是由平面镜的交叉角决定的,而且,影响调谐精度的三种主要因素被控制在光纤光栅生产允许的范围内,即推动机构的位移误差系数Cd为~-0.08nm/μm,楔块的倾斜误差系数Cα为-0.15~0.23nm/(′),和转动机构的传动角误差系数Cβ为~-0.08nm/(′)。 展开更多
关键词 楔块调整式 Talbot干涉仪 Bragg波长 调谐误差 调整器 移动 转动
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Research on CMOS Mm-Wave Circuits and Systems for Wireless Communications 被引量:2
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作者 JIA Haikun CHI Baoyong +6 位作者 KUANG Lixue YU Xiaobao CHEN Lei ZHU Wei WEI Meng SONG Zheng WANG Zhihua 《China Communications》 SCIE CSCD 2015年第5期1-13,共13页
This paper lenges in the design of discusses some chal- millimeter-wave (mln- wave) circuits and systems for 5th generation (5G) wireless systems in CMOS process. The properties of some passive and active devices ... This paper lenges in the design of discusses some chal- millimeter-wave (mln- wave) circuits and systems for 5th generation (5G) wireless systems in CMOS process. The properties of some passive and active devices such as inductors, capacitors, transmission lines, translbrmers and transistors in mm-wave frequency band are discussed. Self-healing technique dealing with PVT variation, res- onant mode switching technique to enhance frequency tuning range of voltage controlled oscillator (VCO) and dual mode technique for power amplifier (PA) efficiency enhancement are introduced. At last, A fully-integrated 60 GHz 5 Gb/s QPSK transceiver with the transmit/receive (T/R) switch in 65nm CMOS process is introduced. The measured error vector magnitude (EVM) of the TX is -21.9 dB while the bit error rate (BER) of the RX with a -52 dBm sine-wave input is below 8e-7 when transmitting/receiving 5 Gb/s data. The transceiver is powered by 1.0 V and 1.2 V supply (except the phase-frequency detector and charge-pump in the frequency synthesizer which are powered by 2.5 V supply) and con- sumes 135 mW in TX mode and 176 mW in RX mode. 展开更多
关键词 CMOS MM-WAVE devices VCO PA sell-healing TRANSCEIVER
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