On-off keying (OOK) is one of the modulation schemes for non-coherent impulse radio Ultra-wideband systems. In this paper, the utilization of the kurtosis detector (KD) and fourth power detector (FD) receivers for OOK...On-off keying (OOK) is one of the modulation schemes for non-coherent impulse radio Ultra-wideband systems. In this paper, the utilization of the kurtosis detector (KD) and fourth power detector (FD) receivers for OOK signaling is introduced. We investigate the effect of integration interval and the optimum threshold on the performance of energy detector (ED), KD and FD receivers. The semi analytic expression of BER is obtained by using generalized extreme value distribution function for KD and FD receivers. From performance point of view, the simulation results show that FD receiver outperforms KD and ED receivers. In contrast, the sensitivity to the optimum threshold is greatly reduced in KD receiver compared to ED and FD receivers.展开更多
This paper presents the design and implementation of a digitally calibrated CMOS wideband radio frequency(RF) root-mean-square(RMS) power detector for high accuracy RF automatic gain control(AGC).The proposed RMS powe...This paper presents the design and implementation of a digitally calibrated CMOS wideband radio frequency(RF) root-mean-square(RMS) power detector for high accuracy RF automatic gain control(AGC).The proposed RMS power detector demonstrates accurate power detection in the presence of process,supply voltage, and temperature(PVT) variations by employing a digital calibration scheme.It also consumes low power and occupies a small chip area.The measurement results show that the scheme improves the accuracy of the detector to better than 0.3 dB over the PVT variations and wide operating frequency range from 0.2 to 0.8 GHz.Implemented in a 0.18μm CMOS process and occupying a small die area of 263×214μm^2,the proposed digitally calibrated CMOS RMS power detector only consumes 1.6 mA in power detection mode and 2.1 mA in digital calibration mode from a 1.8 V supply voltage.展开更多
A design of high dynamic range linear radio frequency power detector （PD）, aimed for transmitter carrier leakage suppression is presented in this paper. Based on the logarithmic amplifier principle, this detector ut...A design of high dynamic range linear radio frequency power detector （PD）, aimed for transmitter carrier leakage suppression is presented in this paper. Based on the logarithmic amplifier principle, this detector utilizes the successive detection method to achieve a high dynamic range in the radio frequency band. In order to increase sensitivity, a low noise amplifier （LNA） is placed in the front of this detector. DC coupling is adopted in this architecture to reduce parasitics and save area, but this will unavoidably cause DC offsets in the circuit which are detrimental to the dynamic range. So a DC offset cancelling （DCOC） technique is proposed to solve the problem. Finally, this detector was fabricated in the SMIC 0.13μm CMOS process. The measured results show that it achieves a wide dynamic range of 50 dB/40 dB with log errors in 4-1 dB at 900 MHz/2 GHz, while draws 16 mA from a 1.5 V power supply. The active chip area is 0.27×0.67 mm2.展开更多
An E-band high speed power detector MMIC using 0.1 μm pHEMT technology has been designed, manufactured and experimentally characterized. By employing a 4-way quadrature structure for phase cancellation, the first, se...An E-band high speed power detector MMIC using 0.1 μm pHEMT technology has been designed, manufactured and experimentally characterized. By employing a 4-way quadrature structure for phase cancellation, the first, second and third harmonics can be suppressed and the ripple at the output is minimized. Compared to conventional topology with a low pass filter, a short response time and high speed performance of demodulation can be reached. Simulated results indicate that the detector is capable of demodulating an on-off keying signal at a data rate up to 5 Gbps. The fabricated chip occupies 1× 1.5 mm2 and the on-wafer measurement shows a return loss of less than -15 dB, responsivity better than 700 mV/mW and dynamic range of more than 25 dB over 70 to 90 GHz.展开更多
1GME037MV is the thrust wear detector of turbine.Before the turbine run up,the value of this channel often fluctuated.The engineer checked the channel,terminal,continuity,insulation,and driver and so on,no problem was...1GME037MV is the thrust wear detector of turbine.Before the turbine run up,the value of this channel often fluctuated.The engineer checked the channel,terminal,continuity,insulation,and driver and so on,no problem was found.At last,when disconnecting the end of the detector from the driver,then re-connected the end to the driver,the channel value is OK,after a while it became wrong again.Measured the resistance of the detector,it is 13O hm when the channel is OK,and 76 Ohm when the channel is wrong.According to the result of the checked,the conclusion is the character of the detector had changed.Both the measured value GME037MV and GME038MV are high 0.7mm,the turbine will trip,In the end the detector of GME037MV was replaced when the unit shut down.展开更多
针对太赫兹探测器的研究现状,分析研究了现有太赫兹探测器的优缺点,并对热释电型太赫兹探测器的热释电材料和吸收材料进行研究,提出了一种基于铌镁钛酸铅(PMNT)晶片的新型太赫兹探测器的设计和制作方法。用PMNT晶片作为热释电材料,碳纳...针对太赫兹探测器的研究现状,分析研究了现有太赫兹探测器的优缺点,并对热释电型太赫兹探测器的热释电材料和吸收材料进行研究,提出了一种基于铌镁钛酸铅(PMNT)晶片的新型太赫兹探测器的设计和制作方法。用PMNT晶片作为热释电材料,碳纳米管作为吸收材料,使用精密减薄抛光工艺和溅射电极工艺等工艺技术,完成了新型热释电太赫兹探测器的设计与制作。并利用该探测器设计了一款太赫兹功率计,经测试,该功率计在0.1~30 THz宽频段、0.5~100 m W大功率动态范围内,功率测量准确度达到了±10%,综合指标达到国际同类产品先进水平,应用效果良好。展开更多
This paper investigates the achievable uplink spectral efficiency(SE) of a massive multi-input multi-output(MIMO) system with a mixed analog-to-digital converter(ADC) receiver architecture, in which some antennas are ...This paper investigates the achievable uplink spectral efficiency(SE) of a massive multi-input multi-output(MIMO) system with a mixed analog-to-digital converter(ADC) receiver architecture, in which some antennas are equipped with full-resolution ADCs while others are deployed with low-resolution ADCs. We derive the theoretical results and corresponding approximate expressions of the achievable SE in multi-cell systems with maximum ratio combining(MRC) detector and in single-cell systems with zero-forcing(ZF) detector. Based on approximated results, the effects of physical parameters, including the transmit power, the number of antennas, the proportion of full-resolution ADCs and the quantization precision of the low-resolution ADCs on the achievable SE are revealed. Furthermore, we propose the power allocation algorithms based on the lower bound and upper bound of approximate achievable SE. Our results show that the total achievable SE improves by increasing the number of BS antennas, the signal-to-noise ratio(SNR), and the quantization precision. Results showcase that proposed power allocation algorithms remarkably improve the total achievable SE comparing to the equal power allocation algorithm, which verifies the effectiveness of our proposed schemes.展开更多
In this paper, we study the effect of the drain current on terahertz detection for Si metal-oxide semiconductor fieldeffect transistors（MOSFETs） both theoretically and experimentally. The analytical model, which is ...In this paper, we study the effect of the drain current on terahertz detection for Si metal-oxide semiconductor fieldeffect transistors（MOSFETs） both theoretically and experimentally. The analytical model, which is based on the smallsignal equivalent circuit of MOSFETs, predicts the significant improvement of the voltage responsivity Rv with the bias current. The experiment on antennas integrated with MOSFETs agrees with the analytical model, but the Rv improvement is accompanied first by a decrease, then an increase of the low-noise equivalent power（NEP） with the applied current. We determine the tradeoff between the low-NEP and high-Rv for the current-biased detectors. As the best-case scenario, we obtained an improvement of about six times in Rv without the cost of a higher NEP. We conclude that the current supply scheme can provide high-quality signal amplification in practical CMOS terahertz detection.展开更多
文摘On-off keying (OOK) is one of the modulation schemes for non-coherent impulse radio Ultra-wideband systems. In this paper, the utilization of the kurtosis detector (KD) and fourth power detector (FD) receivers for OOK signaling is introduced. We investigate the effect of integration interval and the optimum threshold on the performance of energy detector (ED), KD and FD receivers. The semi analytic expression of BER is obtained by using generalized extreme value distribution function for KD and FD receivers. From performance point of view, the simulation results show that FD receiver outperforms KD and ED receivers. In contrast, the sensitivity to the optimum threshold is greatly reduced in KD receiver compared to ED and FD receivers.
基金supported by the National High Technology Research and Development Program of China(No.2009AA011608)the Chinese National Major Science and Technology Projects Program(No.2009ZX01031-002-011-001)
文摘This paper presents the design and implementation of a digitally calibrated CMOS wideband radio frequency(RF) root-mean-square(RMS) power detector for high accuracy RF automatic gain control(AGC).The proposed RMS power detector demonstrates accurate power detection in the presence of process,supply voltage, and temperature(PVT) variations by employing a digital calibration scheme.It also consumes low power and occupies a small chip area.The measurement results show that the scheme improves the accuracy of the detector to better than 0.3 dB over the PVT variations and wide operating frequency range from 0.2 to 0.8 GHz.Implemented in a 0.18μm CMOS process and occupying a small die area of 263×214μm^2,the proposed digitally calibrated CMOS RMS power detector only consumes 1.6 mA in power detection mode and 2.1 mA in digital calibration mode from a 1.8 V supply voltage.
基金Project supported by the Important National Science & Technology Specific Projects,China(No.2010ZX03001-004)the National High Technology Research and Development Program of China(No.2009AA011605)
文摘A design of high dynamic range linear radio frequency power detector （PD）, aimed for transmitter carrier leakage suppression is presented in this paper. Based on the logarithmic amplifier principle, this detector utilizes the successive detection method to achieve a high dynamic range in the radio frequency band. In order to increase sensitivity, a low noise amplifier （LNA） is placed in the front of this detector. DC coupling is adopted in this architecture to reduce parasitics and save area, but this will unavoidably cause DC offsets in the circuit which are detrimental to the dynamic range. So a DC offset cancelling （DCOC） technique is proposed to solve the problem. Finally, this detector was fabricated in the SMIC 0.13μm CMOS process. The measured results show that it achieves a wide dynamic range of 50 dB/40 dB with log errors in 4-1 dB at 900 MHz/2 GHz, while draws 16 mA from a 1.5 V power supply. The active chip area is 0.27×0.67 mm2.
基金supported by the National High Technology Research and Development Program of China(No.2015AA01A704)
文摘An E-band high speed power detector MMIC using 0.1 μm pHEMT technology has been designed, manufactured and experimentally characterized. By employing a 4-way quadrature structure for phase cancellation, the first, second and third harmonics can be suppressed and the ripple at the output is minimized. Compared to conventional topology with a low pass filter, a short response time and high speed performance of demodulation can be reached. Simulated results indicate that the detector is capable of demodulating an on-off keying signal at a data rate up to 5 Gbps. The fabricated chip occupies 1× 1.5 mm2 and the on-wafer measurement shows a return loss of less than -15 dB, responsivity better than 700 mV/mW and dynamic range of more than 25 dB over 70 to 90 GHz.
文摘1GME037MV is the thrust wear detector of turbine.Before the turbine run up,the value of this channel often fluctuated.The engineer checked the channel,terminal,continuity,insulation,and driver and so on,no problem was found.At last,when disconnecting the end of the detector from the driver,then re-connected the end to the driver,the channel value is OK,after a while it became wrong again.Measured the resistance of the detector,it is 13O hm when the channel is OK,and 76 Ohm when the channel is wrong.According to the result of the checked,the conclusion is the character of the detector had changed.Both the measured value GME037MV and GME038MV are high 0.7mm,the turbine will trip,In the end the detector of GME037MV was replaced when the unit shut down.
文摘针对太赫兹探测器的研究现状,分析研究了现有太赫兹探测器的优缺点,并对热释电型太赫兹探测器的热释电材料和吸收材料进行研究,提出了一种基于铌镁钛酸铅(PMNT)晶片的新型太赫兹探测器的设计和制作方法。用PMNT晶片作为热释电材料,碳纳米管作为吸收材料,使用精密减薄抛光工艺和溅射电极工艺等工艺技术,完成了新型热释电太赫兹探测器的设计与制作。并利用该探测器设计了一款太赫兹功率计,经测试,该功率计在0.1~30 THz宽频段、0.5~100 m W大功率动态范围内,功率测量准确度达到了±10%,综合指标达到国际同类产品先进水平,应用效果良好。
基金supported in part by the National Science Foundation(NSFC)for Distinguished Young Scholars of China with Grant 61625106the National Natural Science Foundation of China under Grant 61531011+1 种基金the Hong Kong,Macao and Taiwan Science and Technology Cooperation Program of China(2016YFE0123100)the Guangzhou University project under Grant 27000503123
文摘This paper investigates the achievable uplink spectral efficiency(SE) of a massive multi-input multi-output(MIMO) system with a mixed analog-to-digital converter(ADC) receiver architecture, in which some antennas are equipped with full-resolution ADCs while others are deployed with low-resolution ADCs. We derive the theoretical results and corresponding approximate expressions of the achievable SE in multi-cell systems with maximum ratio combining(MRC) detector and in single-cell systems with zero-forcing(ZF) detector. Based on approximated results, the effects of physical parameters, including the transmit power, the number of antennas, the proportion of full-resolution ADCs and the quantization precision of the low-resolution ADCs on the achievable SE are revealed. Furthermore, we propose the power allocation algorithms based on the lower bound and upper bound of approximate achievable SE. Our results show that the total achievable SE improves by increasing the number of BS antennas, the signal-to-noise ratio(SNR), and the quantization precision. Results showcase that proposed power allocation algorithms remarkably improve the total achievable SE comparing to the equal power allocation algorithm, which verifies the effectiveness of our proposed schemes.
基金Project supported by the National Key R&D Program of China(Grant No.2016YFB-0402403)the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20141321)+1 种基金CAST Project,China(Grant No.08201601)the National Science Foundation for Young Scholars of China(Grant No.61404072)
文摘In this paper, we study the effect of the drain current on terahertz detection for Si metal-oxide semiconductor fieldeffect transistors（MOSFETs） both theoretically and experimentally. The analytical model, which is based on the smallsignal equivalent circuit of MOSFETs, predicts the significant improvement of the voltage responsivity Rv with the bias current. The experiment on antennas integrated with MOSFETs agrees with the analytical model, but the Rv improvement is accompanied first by a decrease, then an increase of the low-noise equivalent power（NEP） with the applied current. We determine the tradeoff between the low-NEP and high-Rv for the current-biased detectors. As the best-case scenario, we obtained an improvement of about six times in Rv without the cost of a higher NEP. We conclude that the current supply scheme can provide high-quality signal amplification in practical CMOS terahertz detection.
