Based on the analyses of the reported Gilbert mixers operating at low supply vol tage,a down-conversion mixer and an up-conversion mixer for 2.4GHz bluetooth transceiver are presented with the modified low voltage de...Based on the analyses of the reported Gilbert mixers operating at low supply vol tage,a down-conversion mixer and an up-conversion mixer for 2.4GHz bluetooth transceiver are presented with the modified low voltage design techniques,respe ctively.Feedback and current mirror techniques suitable for low voltage operatio n are used to improve the linearity of the up-conversion mixer,and folded-casc ode output stage is adopted to optimize the noise and conversion gain of the dow n-conversion mixer operating at low voltage.Based on 0.35μm CMOS technology,s imulations are performed with 2V supply voltage.The results show that 20dBm thir d-order intercept point (IIP3),87mV output signal amplitude are achieved for up -conversion mixer with about 3mA current;while 20dB conversion gain (CG),6.5nV /Hz input-referred noise,4.4dBm IIP3 are obtained for down-conversion mixer with about 3.5mA current.展开更多
This research is about changing rate of seeds germination by low frequencies electromagnetic field. The method of resonant frequencies to increase seeds germination were developed and patented by authors of this resea...This research is about changing rate of seeds germination by low frequencies electromagnetic field. The method of resonant frequencies to increase seeds germination were developed and patented by authors of this research. The idea of the means is to research a technique to changing a capacitor component of full resistance for extracts of wheat and sunflower seeds under the influence of low frequency electromagnetic field （LF EMF）. After the green sprouting experimentin cups of Petri, it was found that most frequencies found by this method are good, and the best results increasing germination of wheat of a grade Krasnodar 99 were after treatment with 31 Hz, for sunflower of a grade Buzuluk 16 Hz.展开更多
The RF system for the Beijing Electron Positron Collider Upgrade(BEPCⅡ)Project had been working since Nov,2006.It consists of 3 subsystems including the superconducting cavity,the klystron and the low level RF system...The RF system for the Beijing Electron Positron Collider Upgrade(BEPCⅡ)Project had been working since Nov,2006.It consists of 3 subsystems including the superconducting cavity,the klystron and the low level RF system.Compared with the former RF system,the operating frequency has been changed from 200MHz to 499.8MHz, and the superconducting cavity has been used to replace the normal cavity.Up to now,the RF system performance is good and achieves the designed target.展开更多
文摘Based on the analyses of the reported Gilbert mixers operating at low supply vol tage,a down-conversion mixer and an up-conversion mixer for 2.4GHz bluetooth transceiver are presented with the modified low voltage design techniques,respe ctively.Feedback and current mirror techniques suitable for low voltage operatio n are used to improve the linearity of the up-conversion mixer,and folded-casc ode output stage is adopted to optimize the noise and conversion gain of the dow n-conversion mixer operating at low voltage.Based on 0.35μm CMOS technology,s imulations are performed with 2V supply voltage.The results show that 20dBm thir d-order intercept point (IIP3),87mV output signal amplitude are achieved for up -conversion mixer with about 3mA current;while 20dB conversion gain (CG),6.5nV /Hz input-referred noise,4.4dBm IIP3 are obtained for down-conversion mixer with about 3.5mA current.
文摘This research is about changing rate of seeds germination by low frequencies electromagnetic field. The method of resonant frequencies to increase seeds germination were developed and patented by authors of this research. The idea of the means is to research a technique to changing a capacitor component of full resistance for extracts of wheat and sunflower seeds under the influence of low frequency electromagnetic field （LF EMF）. After the green sprouting experimentin cups of Petri, it was found that most frequencies found by this method are good, and the best results increasing germination of wheat of a grade Krasnodar 99 were after treatment with 31 Hz, for sunflower of a grade Buzuluk 16 Hz.
文摘The RF system for the Beijing Electron Positron Collider Upgrade(BEPCⅡ)Project had been working since Nov,2006.It consists of 3 subsystems including the superconducting cavity,the klystron and the low level RF system.Compared with the former RF system,the operating frequency has been changed from 200MHz to 499.8MHz, and the superconducting cavity has been used to replace the normal cavity.Up to now,the RF system performance is good and achieves the designed target.
