A W-band frequency doubler MMIC is designed and fabricated using 1-μm InP DHBT technology. Ac tive halun is employed to transform the single-ended signal into differential output. Push-push configuration loaded with ...A W-band frequency doubler MMIC is designed and fabricated using 1-μm InP DHBT technology. Ac tive halun is employed to transform the single-ended signal into differential output. Push-push configuration loaded with harmonic resonant network is utilized to acquire the second harmonic frequency. A multi-stage differential structure improves the conversion gain and suppresses the fundamental frequency. The MMIC occupies an area of 0.55 x 0.5 mm2 with 18 DHBTs integrated. Measurements show that the output power is above 5.8 dBm with the suppression of fundamental frequency below -16 dBc and the conversion Rain above 4.7 dB over 75-80 GHz.展开更多
In this paper, we present a 60 GHz substrate-integrated waveguide fed-steerable low-temperature cofired ceramics array. The antenna is suitable for transmitting and receiving on the 60 GHz wireless personal area netwo...In this paper, we present a 60 GHz substrate-integrated waveguide fed-steerable low-temperature cofired ceramics array. The antenna is suitable for transmitting and receiving on the 60 GHz wireless personal area network frequency band. The wireless system can be used for HDTV, high-data-rate networking up to 4.5 GBit/s, security and surveillance, and similar applications.展开更多
This paper presents an E-band frequency quadrupler in 40-nm CMOS technology.The circuit employs two push-push frequency doublers and two single-stage neutralized amplifiers.The pseudo-differential class-B biased casco...This paper presents an E-band frequency quadrupler in 40-nm CMOS technology.The circuit employs two push-push frequency doublers and two single-stage neutralized amplifiers.The pseudo-differential class-B biased cascode topo-logy is adopted for the frequency doubler,which improves the reverse isolation and the conversion gain.Neutralization tech-nique is applied to increase the stability and the power gain of the amplifiers simultaneously.The stacked transformers are used for single-ended-to-differential transformation as well as output bandpass filtering.The output bandpass filter enhances the 4th-harmonic output power,while rejecting the undesired harmonics,especially the 2nd harmonic.The core chip is 0.23 mm^(2)in size and consumes 34 mW.The measured 4th harmonic achieves a maximum output power of 1.7 dBm with a peak conversion gain of 3.4 dB at 76 GHz.The fundamental and 2nd-harmonic suppressions of over 45 and 20 dB are achieved for the spectrum from 74 to 82 GHz,respectively.展开更多
基于InGaP/GaAs异质结双极晶体管（HBT）工艺设计了一款X波段低相噪单片集成压控振荡器（VCO）,该VCO采用Colpitts双推（push-push）电路结构,芯片上集成了负阻振荡电路、分布式谐振器、变容二极管和耦合输出电路。通过优化HBT器件尺寸...基于InGaP/GaAs异质结双极晶体管（HBT）工艺设计了一款X波段低相噪单片集成压控振荡器（VCO）,该VCO采用Colpitts双推（push-push）电路结构,芯片上集成了负阻振荡电路、分布式谐振器、变容二极管和耦合输出电路。通过优化HBT器件尺寸以降低其引入的1/f噪声,同时设计高Q值分布式谐振电路,从而有效降低了VCO的输出相位噪声。通过采用背靠背变容二极管对来增加VCO输出频率调谐带宽。测试结果表明,所设计芯片在5 V供电时的电流约180 m A,电调电压在1-13 V变化下输出频率覆盖8.8-10 GHz,典型输出功率为10 d Bm,单边带相位噪声为-115 d Bc/Hz@100 k Hz。芯片尺寸为2.5 mm×1.6 mm。展开更多
Electrocatalytic reduction of nitrogen into ammonia(NH_(3))is a highly attractive but challenging route for NH_(3)production.We propose to realize a synergetic work of multi reaction sites to overcome the limitation o...Electrocatalytic reduction of nitrogen into ammonia(NH_(3))is a highly attractive but challenging route for NH_(3)production.We propose to realize a synergetic work of multi reaction sites to overcome the limitation of sustainable NH_(3)production.Herein,using ruthenium-sulfur-carbon(Ru-S-C)catalyst as a prototype,we show that the Ru/S dual-site cooperates to catalyse eletrocatalytic nitrogen reduction reaction(eNRR)at ambient conditions.With the combination of theoretical calculations,in situ Raman spectroscopy,and experimental observation,we demonstrate that such Ru/S dual-site cooperation greatly facilitates the activation and first protonation of N_(2)in the rate-determining step of eNRR.As a result,Ru-S-C catalyst exhibits significantly enhanced eNRR performance compared with the routine Ru-N-C catalyst via a single-site catalytic mechanism.We anticipate that our specifically designed dual-site collaborative catalytic mechanism will open up a new way to offers new opportunities for advancing sustainable NH_(3)production.展开更多
该文设计了一个基于双推式结构的介质振荡器,输出频率为17 GHz。该振荡器由两个独立的串联反馈式介质振荡器构成。该文介绍了串联反馈式介质振荡器的详细设计过程,并且应用了理论计算简化仿真过程,提高仿真精度。在振荡器的输出端口,用...该文设计了一个基于双推式结构的介质振荡器,输出频率为17 GHz。该振荡器由两个独立的串联反馈式介质振荡器构成。该文介绍了串联反馈式介质振荡器的详细设计过程,并且应用了理论计算简化仿真过程,提高仿真精度。在振荡器的输出端口,用宽带威尔金森功率合成器同时实现了基波和二次谐波的合成,并应用λ/4开路微带线提高了基波抑制度。由仿真结果可得到17 GHz的输出功率为3 d Bm,相位噪声达到了120.8 d Bc/Hz@10 k Hz,基波抑制度超过了50 d Bc。展开更多
基金supported by the National Basic Research Program of China(No.2010CB327502)
文摘A W-band frequency doubler MMIC is designed and fabricated using 1-μm InP DHBT technology. Ac tive halun is employed to transform the single-ended signal into differential output. Push-push configuration loaded with harmonic resonant network is utilized to acquire the second harmonic frequency. A multi-stage differential structure improves the conversion gain and suppresses the fundamental frequency. The MMIC occupies an area of 0.55 x 0.5 mm2 with 18 DHBTs integrated. Measurements show that the output power is above 5.8 dBm with the suppression of fundamental frequency below -16 dBc and the conversion Rain above 4.7 dB over 75-80 GHz.
文摘In this paper, we present a 60 GHz substrate-integrated waveguide fed-steerable low-temperature cofired ceramics array. The antenna is suitable for transmitting and receiving on the 60 GHz wireless personal area network frequency band. The wireless system can be used for HDTV, high-data-rate networking up to 4.5 GBit/s, security and surveillance, and similar applications.
基金the National Key Research,Development Program of China under Grant 2018YFB1802100the Major Key Project of PCL(PCL2021A01-2).
文摘This paper presents an E-band frequency quadrupler in 40-nm CMOS technology.The circuit employs two push-push frequency doublers and two single-stage neutralized amplifiers.The pseudo-differential class-B biased cascode topo-logy is adopted for the frequency doubler,which improves the reverse isolation and the conversion gain.Neutralization tech-nique is applied to increase the stability and the power gain of the amplifiers simultaneously.The stacked transformers are used for single-ended-to-differential transformation as well as output bandpass filtering.The output bandpass filter enhances the 4th-harmonic output power,while rejecting the undesired harmonics,especially the 2nd harmonic.The core chip is 0.23 mm^(2)in size and consumes 34 mW.The measured 4th harmonic achieves a maximum output power of 1.7 dBm with a peak conversion gain of 3.4 dB at 76 GHz.The fundamental and 2nd-harmonic suppressions of over 45 and 20 dB are achieved for the spectrum from 74 to 82 GHz,respectively.
文摘基于InGaP/GaAs异质结双极晶体管（HBT）工艺设计了一款X波段低相噪单片集成压控振荡器（VCO）,该VCO采用Colpitts双推（push-push）电路结构,芯片上集成了负阻振荡电路、分布式谐振器、变容二极管和耦合输出电路。通过优化HBT器件尺寸以降低其引入的1/f噪声,同时设计高Q值分布式谐振电路,从而有效降低了VCO的输出相位噪声。通过采用背靠背变容二极管对来增加VCO输出频率调谐带宽。测试结果表明,所设计芯片在5 V供电时的电流约180 m A,电调电压在1-13 V变化下输出频率覆盖8.8-10 GHz,典型输出功率为10 d Bm,单边带相位噪声为-115 d Bc/Hz@100 k Hz。芯片尺寸为2.5 mm×1.6 mm。
文摘Electrocatalytic reduction of nitrogen into ammonia(NH_(3))is a highly attractive but challenging route for NH_(3)production.We propose to realize a synergetic work of multi reaction sites to overcome the limitation of sustainable NH_(3)production.Herein,using ruthenium-sulfur-carbon(Ru-S-C)catalyst as a prototype,we show that the Ru/S dual-site cooperates to catalyse eletrocatalytic nitrogen reduction reaction(eNRR)at ambient conditions.With the combination of theoretical calculations,in situ Raman spectroscopy,and experimental observation,we demonstrate that such Ru/S dual-site cooperation greatly facilitates the activation and first protonation of N_(2)in the rate-determining step of eNRR.As a result,Ru-S-C catalyst exhibits significantly enhanced eNRR performance compared with the routine Ru-N-C catalyst via a single-site catalytic mechanism.We anticipate that our specifically designed dual-site collaborative catalytic mechanism will open up a new way to offers new opportunities for advancing sustainable NH_(3)production.
文摘该文设计了一个基于双推式结构的介质振荡器,输出频率为17 GHz。该振荡器由两个独立的串联反馈式介质振荡器构成。该文介绍了串联反馈式介质振荡器的详细设计过程,并且应用了理论计算简化仿真过程,提高仿真精度。在振荡器的输出端口,用宽带威尔金森功率合成器同时实现了基波和二次谐波的合成,并应用λ/4开路微带线提高了基波抑制度。由仿真结果可得到17 GHz的输出功率为3 d Bm,相位噪声达到了120.8 d Bc/Hz@10 k Hz,基波抑制度超过了50 d Bc。
