提出了一种具有宽电流可调谐范围的新型CMOS电调谐第二代电流传输器(ECCII),通过引入基于差分差动电流传输器(DDCC)的对数反对数电流放大器,使电流增益通过偏置电流连续可调,在一定偏置电流下,调节系数0<k≤10。输入端采用的轨对轨...提出了一种具有宽电流可调谐范围的新型CMOS电调谐第二代电流传输器(ECCII),通过引入基于差分差动电流传输器(DDCC)的对数反对数电流放大器,使电流增益通过偏置电流连续可调,在一定偏置电流下,调节系数0<k≤10。输入端采用的轨对轨结构通过在其第二级加入共源共栅电流镜,提高了电压跟随精度。采用SMIC 0.18μm CMOS工艺参数,在±1V的供电电源条件下,用Spectre对电路进行仿真。结果表明:vx/vy和iz/ix的-3 d B带宽分别为300 MHz和155 MHz,电压跟随精度为0.997,功耗为1.642 4 m W。经验证,该电路可用于设计可调谐连续时间电流模式滤波器,具有广泛的应用前景。展开更多
A low-power 14-bit 150MS/s an- alog-to-digital converter （ADC） is present- ed for communication applications. Range scaling enables a maximal 2-Vp-p input with a single-stage opamp adopted. Opamp and capacitor shari...A low-power 14-bit 150MS/s an- alog-to-digital converter （ADC） is present- ed for communication applications. Range scaling enables a maximal 2-Vp-p input with a single-stage opamp adopted. Opamp and capacitor sharing between the first multi- plying digital-to-analog converter （MDAC） and the second one reduces the total opamp power further. The dedicated sample-and- hold amplifier （SHA） is removed to lower the power and the noise. The blind calibration of linearity errors is proposed to improve the per- formance. The prototype ADC is fabricated in a 130rim CMOS process with a 1.3-V supply voltage. The SNDR of the ADC is 71.3 dB with a 2.4 MHz input and remains 68.5 dB for a 120 MHz input. It consumes 85 roW, which includes 57 mW for the ADC core, 11 mW for the low jitter clock receiver and 17 mW for the high-speed reference buffer.展开更多
Human body communication is proposed as a promising body proximal comanunication tech- nology for body sensor networks. To achieve low power and slmll volume ill the sensor nodes, a Ra-dio Frequency （RF） application...Human body communication is proposed as a promising body proximal comanunication tech- nology for body sensor networks. To achieve low power and slmll volume ill the sensor nodes, a Ra-dio Frequency （RF） application-specific integrated circuit transceiver tbr Human Body Commnunication （HBC） is presented and the characteristics of HBC are investigated. A high data rate On-Off Keying （OOK）/Frequency-Shift Keying （FSK） modulation protocol and an OOK/FSK delrodulator circuit are introduced in this paper, with a data-rate-to-carrier-frequency ratio up to 70%. A low noise amplifier is proposed to handle the dynamic range problem and improve the sensitivity of the receiver path. In addi-tion, a low power autonmatic-gain-control system is realized using a novel architecture, thereby render-ing the peak detector circuit and loop filter unneces-sary. Finally, the complete chip is fabricated. Simula-tion results suggest receiver sensitivity to be-75 dBm. The transceiver shows an overall power con-smxption of 32 mW when data rate is 5 Mbps, de-livering a P1dB output power of - 30 dBm.展开更多
For digital channelized frequency division multiple access based satellite communication(SATCOM) systems,it is a challenging but critical issue to improve the transponder power and spectrum efficiency simultaneously u...For digital channelized frequency division multiple access based satellite communication(SATCOM) systems,it is a challenging but critical issue to improve the transponder power and spectrum efficiency simultaneously under limited and non-linear high-power amplifier conditions.In this paper,different from the traditional link supportability designs aiming at minimizing the total transponder output power,a maximal sum Shannon capacity optimization objective is firstly raised subject to link supportability constraints.Furthermore,an efficient multilevel optimization(MO) algorithm is proposed to solve the considered optimization problem in the case of single link for each terminal.Moreover,in the case of multiple links for one terminal,an improved MO algorithm involving Golden section and discrete gradient searching procedures is proposed to optimize power allocation over all links.Finally,several numerical results are provided to demonstrate the effectiveness of our proposals.Comparison results show that,by the MO algorithm,not only all links' supportability can be guaranteed but also a larger sum capacity can be achieved with lower complexity.展开更多
The output of uncooled microbolometer is nonuniform, and the traditional two-point nonuniformity correction method requires a tight restriction on substrate temperature. The circuit proposed by this article can relax ...The output of uncooled microbolometer is nonuniform, and the traditional two-point nonuniformity correction method requires a tight restriction on substrate temperature. The circuit proposed by this article can relax the restriction on the substrate temperature and perform nonuniformity correction when reading out the image signal. The dummy pixels reduce static current. And the Column shared DACs transfer correction data to the gates of MOS transistors and the positive reference edge of amplifier, to control the bias current of detector and dummy one, and set the start point of integration. This circuit has higher sensitivity, wider dynamic range, and frame frequency of more than 30 Hz for 128×128 array. PSPICE simulation results seem that this circuit functions well.展开更多
In order to monitor deformation of high temperature components for a long time,a sensing device integrating a bridge-shaped mechanical displacement amplifier has been designed.This sensing device has higher resolution...In order to monitor deformation of high temperature components for a long time,a sensing device integrating a bridge-shaped mechanical displacement amplifier has been designed.This sensing device has higher resolution and accuracy than conventional extensometers.However,the relation between the magnification ratio and the structure size of the displacement amplifier is a bottleneck of sensing device design.Addressing this,the magnification ratio of a mechanical displacement amplifier is analytically derived based on its geometry structure.Six prototypes of the displacement amplifier made in propathene are manufactured,and an experimental system is set up to validate the accuracy of the established magnification ratio equation.Theoretical magnification ratios and experimental magnification ratios are compared and agree well,which verifies that the proposed equation is reliable.This analytical equation provides an effective design method for bridge-shaped mechanical displacement amplifiers with an expected magnification ratio.展开更多
文摘提出了一种具有宽电流可调谐范围的新型CMOS电调谐第二代电流传输器(ECCII),通过引入基于差分差动电流传输器(DDCC)的对数反对数电流放大器,使电流增益通过偏置电流连续可调,在一定偏置电流下,调节系数0<k≤10。输入端采用的轨对轨结构通过在其第二级加入共源共栅电流镜,提高了电压跟随精度。采用SMIC 0.18μm CMOS工艺参数,在±1V的供电电源条件下,用Spectre对电路进行仿真。结果表明:vx/vy和iz/ix的-3 d B带宽分别为300 MHz和155 MHz,电压跟随精度为0.997,功耗为1.642 4 m W。经验证,该电路可用于设计可调谐连续时间电流模式滤波器,具有广泛的应用前景。
基金supported by the Major National Science & Technology Program of China under Grant No.2012ZX03004004-002National High Technology Research and Development Program of China under Grant No. 2013AA014302
文摘A low-power 14-bit 150MS/s an- alog-to-digital converter （ADC） is present- ed for communication applications. Range scaling enables a maximal 2-Vp-p input with a single-stage opamp adopted. Opamp and capacitor sharing between the first multi- plying digital-to-analog converter （MDAC） and the second one reduces the total opamp power further. The dedicated sample-and- hold amplifier （SHA） is removed to lower the power and the noise. The blind calibration of linearity errors is proposed to improve the per- formance. The prototype ADC is fabricated in a 130rim CMOS process with a 1.3-V supply voltage. The SNDR of the ADC is 71.3 dB with a 2.4 MHz input and remains 68.5 dB for a 120 MHz input. It consumes 85 roW, which includes 57 mW for the ADC core, 11 mW for the low jitter clock receiver and 17 mW for the high-speed reference buffer.
基金This study was supported partially by the Projects of National Natural Science Foundation of China under Crants No. 60932001, No.61072031 the National 863 Program of China un-der Crant No. 2012AA02A604+3 种基金 the National 973 Program of China under Cwant No. 2010CB732606 the Next Generation Communication Technology Major Project of National S＆T un-der Crant No. 2013ZX03005013 the ＂One-hundred Talent＂ and the ＂Low-cost Healthcare＂ Programs of Chinese Academy of Sciences and the Guangdong Innovation Research Team Funds for Low-cost Healthcare and Irrage-Guided Therapy.
文摘Human body communication is proposed as a promising body proximal comanunication tech- nology for body sensor networks. To achieve low power and slmll volume ill the sensor nodes, a Ra-dio Frequency （RF） application-specific integrated circuit transceiver tbr Human Body Commnunication （HBC） is presented and the characteristics of HBC are investigated. A high data rate On-Off Keying （OOK）/Frequency-Shift Keying （FSK） modulation protocol and an OOK/FSK delrodulator circuit are introduced in this paper, with a data-rate-to-carrier-frequency ratio up to 70%. A low noise amplifier is proposed to handle the dynamic range problem and improve the sensitivity of the receiver path. In addi-tion, a low power autonmatic-gain-control system is realized using a novel architecture, thereby render-ing the peak detector circuit and loop filter unneces-sary. Finally, the complete chip is fabricated. Simula-tion results suggest receiver sensitivity to be-75 dBm. The transceiver shows an overall power con-smxption of 32 mW when data rate is 5 Mbps, de-livering a P1dB output power of - 30 dBm.
基金supportedin part by Natural Science Foundation under grant No.91338108,91438206Co-innovation Laboratory of Aerospace Broadband Network Technology
文摘For digital channelized frequency division multiple access based satellite communication(SATCOM) systems,it is a challenging but critical issue to improve the transponder power and spectrum efficiency simultaneously under limited and non-linear high-power amplifier conditions.In this paper,different from the traditional link supportability designs aiming at minimizing the total transponder output power,a maximal sum Shannon capacity optimization objective is firstly raised subject to link supportability constraints.Furthermore,an efficient multilevel optimization(MO) algorithm is proposed to solve the considered optimization problem in the case of single link for each terminal.Moreover,in the case of multiple links for one terminal,an improved MO algorithm involving Golden section and discrete gradient searching procedures is proposed to optimize power allocation over all links.Finally,several numerical results are provided to demonstrate the effectiveness of our proposals.Comparison results show that,by the MO algorithm,not only all links' supportability can be guaranteed but also a larger sum capacity can be achieved with lower complexity.
基金the National Science Foundation of China (No:60377036).
文摘The output of uncooled microbolometer is nonuniform, and the traditional two-point nonuniformity correction method requires a tight restriction on substrate temperature. The circuit proposed by this article can relax the restriction on the substrate temperature and perform nonuniformity correction when reading out the image signal. The dummy pixels reduce static current. And the Column shared DACs transfer correction data to the gates of MOS transistors and the positive reference edge of amplifier, to control the bias current of detector and dummy one, and set the start point of integration. This circuit has higher sensitivity, wider dynamic range, and frame frequency of more than 30 Hz for 128×128 array. PSPICE simulation results seem that this circuit functions well.
基金supported by the 111 Project of China(No.B13020)the Shanghai Pujiang Program(No.15PJD010)
文摘In order to monitor deformation of high temperature components for a long time,a sensing device integrating a bridge-shaped mechanical displacement amplifier has been designed.This sensing device has higher resolution and accuracy than conventional extensometers.However,the relation between the magnification ratio and the structure size of the displacement amplifier is a bottleneck of sensing device design.Addressing this,the magnification ratio of a mechanical displacement amplifier is analytically derived based on its geometry structure.Six prototypes of the displacement amplifier made in propathene are manufactured,and an experimental system is set up to validate the accuracy of the established magnification ratio equation.Theoretical magnification ratios and experimental magnification ratios are compared and agree well,which verifies that the proposed equation is reliable.This analytical equation provides an effective design method for bridge-shaped mechanical displacement amplifiers with an expected magnification ratio.
