A differential low-voltage high gain current-mode integrated RF front end for an 802.1 lb WLAN is proposed. It contains a differential transeonductance low noise amplifier （Gm-LNA） and a differential current- mode d...A differential low-voltage high gain current-mode integrated RF front end for an 802.1 lb WLAN is proposed. It contains a differential transeonductance low noise amplifier （Gm-LNA） and a differential current- mode down converted mixer. The single terminal of the Gm-LNA contains just one MOS transistor, two capacitors and two inductors. The gate source shunt capacitors, Cx1 and Cx2, can not only reduce the effects of gate-source Cgs on resonance frequency and input-matching impedance, but they also enable the gate inductance Lgl,2 to be selected at a very small value. The current-mode mixer is composed of four switched current mirrors. Adjusting the ratio of the drain channel sizes of the switched current mirrors can increase the gain of the mixer and accordingly increase the gain of RF receiver front-end. The RF front-end operates under 1 V supply voltage. The receiver RFIC was fabricated using a chartered 0. 18 μm CMOS process. The integrated RF receiver front-end has a measured power conversion gain of 17.48 dB and an input referred third-order intercept point （IIP3） of-7.02 dBm. The total noise figure is 4.5 dB and the power is only 14 mW by post-simulations.展开更多
A novel topology of current mirror （CM） with tunable output current is proposed. Two methods for output current tuning are presented. The first one utilizes an analog input voltage for linear current output, and the...A novel topology of current mirror （CM） with tunable output current is proposed. Two methods for output current tuning are presented. The first one utilizes an analog input voltage for linear current output, and the second one has an N-bit digital input signal for 2N un-continuous current outputs. A linearization method for low noise amplifier （LNA） is proposed and realized with this tunable CM. As the provider of the bias current, the CM has brought the LNA a lower NF （noise figure） and a higher IIP3 （input-referred third-order intercept point） compared with a conventional one. The experimental results show that the LNA achieves 1.47 dB NF and ＋ 19.83 dBm IIP3 at 860 MHz.展开更多
This paper presents two schemes of high performance CMOS current mirror, one of them is used for operational tran-sconductance amplifier (OTA) in analog VLSI systems. The linearity, output impedance, bandwidth and acc...This paper presents two schemes of high performance CMOS current mirror, one of them is used for operational tran-sconductance amplifier (OTA) in analog VLSI systems. The linearity, output impedance, bandwidth and accuracy are the most parameters to determine the performance of the current mirror. Here a comparison of two architectures based on same architecture of the amplifier is presented. This comparison includes: linearity, output impedance, bandwidth and accuracy. These two circuits are validated with simulation in technology AMS 0.35 μm. An operational amplifier based on the adapted current mirror is proposed. Its frequency analysis with large bandwidth is validated with the same technology.展开更多
In order to reduce the chip area and improve the reliability of HVICs, a new high-voltage level-shifting circuit with an integrated low-voltage power supply, two PMOS active resistors and a current mirror is proposed....In order to reduce the chip area and improve the reliability of HVICs, a new high-voltage level-shifting circuit with an integrated low-voltage power supply, two PMOS active resistors and a current mirror is proposed. The integrated low-voltage power supply not only provides energy for the level-shifting circuit and the logic circuit, but also provides voltage signals for the gates and sources of the PMOS active resistors to ensure that they are normally-on. The normally-on PMOS transistors do not, therefore, need to be fabricated in the depletion process. The current mirror ensures that the level-shifting circuit has a constant current, which can reduce the process error of the high-voltage devices of the circuit. Moreover, an improved RS trigger is also proposed to improve the reliability of the circuit. The proposed level-shifting circuit is analyzed and confirmed by simulation with MEDICI, and the simulation results show that the function is achieved well.展开更多
A novel CMOS atto-ampere current mirror （AACM） is proposed which reaches the minimum yet reported current range of 0.4 aA. Operation of this circuit is based on the source voltage modulation instead of the conventio...A novel CMOS atto-ampere current mirror （AACM） is proposed which reaches the minimum yet reported current range of 0.4 aA. Operation of this circuit is based on the source voltage modulation instead of the conventionally used gate voltage modulation which interestingly prevents usage of commonly required voltage shifting in those circuits. The proposed circuit has a simple structure prohibiting large chip area consumption which consumes extremely low power of 1.5 μW. It is thus the best choice for ultra low power low voltage （ULPLV） applications. By using a very simple frequency compensation technique, its bandwidth is widened to 15.8 kHz. Simulation results in SMIC （Semiconductor Manufacturing International Corporation） 0.18 μm CMOS technology with Hspice are presented to demonstrate the validation of the proposed current mirror.展开更多
讨论了开关电流镜不匹配典型来源,基于开关电流电路采用宽长比定标设计的特性分析了最主要的3个失配参数:跨导、域值电压及亚阈值斜率。采用Hspice平台及0.18 um BSIM3_V3.1 SPICE模型给出了开发了用于仿真的电路模型,针对主要失配因素...讨论了开关电流镜不匹配典型来源,基于开关电流电路采用宽长比定标设计的特性分析了最主要的3个失配参数:跨导、域值电压及亚阈值斜率。采用Hspice平台及0.18 um BSIM3_V3.1 SPICE模型给出了开发了用于仿真的电路模型,针对主要失配因素,分析提取了仿真模型参数并进行了分组。在弱反型和强反型2种运行规则条件下,对失配的情况进行了仿真和分析。对开关电流浮栅电流镜提供的失配补偿能力也进行了仿真验证,并给出2种运行规则失配补偿分析和模拟结果,对单一工作点和较宽动态范围条件下失配补偿效果也进行了对比。展开更多
针对配电网发生单相接地故障且分布式电源(distributed generations,DGs)大量接入后,配电网结构和运行方式复杂多变、故障后电气量不明显、故障特征弱等特点,提出一种基于改进局部均值分解(improved local mean decomposition,ILMD)和...针对配电网发生单相接地故障且分布式电源(distributed generations,DGs)大量接入后,配电网结构和运行方式复杂多变、故障后电气量不明显、故障特征弱等特点,提出一种基于改进局部均值分解(improved local mean decomposition,ILMD)和能量相对熵的主动配电网故障定位方法。首先,利用镜像延拓将信号在两端延拓,消除LMD存在的端点效应,同时,在信号中加入自适应噪声,克服LMD存在的模态混叠问题,对各区段暂态零序电流进行ILMD分解;然后对分解后所有乘积函数(product function,PF)的能量相对熵进行计算,所有PF分量的相对能量熵之和即为区段间的相对能量熵,通过所设置的定位判据,对故障区段进行判断。仿真结果表明,所提算法在10 kV小电流接地系统和改进的IEEE33节点系统中,在不同的仿真条件下故障定位结果准确率高,验证了所提方法的准确性。展开更多
基金Project supported by the National Natural Science Foundation of China(No.60776021)the Open Fund Project of Key Laboratory in Hunan Universities,China(No.10K016)
文摘A differential low-voltage high gain current-mode integrated RF front end for an 802.1 lb WLAN is proposed. It contains a differential transeonductance low noise amplifier （Gm-LNA） and a differential current- mode down converted mixer. The single terminal of the Gm-LNA contains just one MOS transistor, two capacitors and two inductors. The gate source shunt capacitors, Cx1 and Cx2, can not only reduce the effects of gate-source Cgs on resonance frequency and input-matching impedance, but they also enable the gate inductance Lgl,2 to be selected at a very small value. The current-mode mixer is composed of four switched current mirrors. Adjusting the ratio of the drain channel sizes of the switched current mirrors can increase the gain of the mixer and accordingly increase the gain of RF receiver front-end. The RF front-end operates under 1 V supply voltage. The receiver RFIC was fabricated using a chartered 0. 18 μm CMOS process. The integrated RF receiver front-end has a measured power conversion gain of 17.48 dB and an input referred third-order intercept point （IIP3） of-7.02 dBm. The total noise figure is 4.5 dB and the power is only 14 mW by post-simulations.
基金supported by the Tianjin Natural Science Foundation,China(No.09JCYBJC00700)
文摘A novel topology of current mirror （CM） with tunable output current is proposed. Two methods for output current tuning are presented. The first one utilizes an analog input voltage for linear current output, and the second one has an N-bit digital input signal for 2N un-continuous current outputs. A linearization method for low noise amplifier （LNA） is proposed and realized with this tunable CM. As the provider of the bias current, the CM has brought the LNA a lower NF （noise figure） and a higher IIP3 （input-referred third-order intercept point） compared with a conventional one. The experimental results show that the LNA achieves 1.47 dB NF and ＋ 19.83 dBm IIP3 at 860 MHz.
文摘This paper presents two schemes of high performance CMOS current mirror, one of them is used for operational tran-sconductance amplifier (OTA) in analog VLSI systems. The linearity, output impedance, bandwidth and accuracy are the most parameters to determine the performance of the current mirror. Here a comparison of two architectures based on same architecture of the amplifier is presented. This comparison includes: linearity, output impedance, bandwidth and accuracy. These two circuits are validated with simulation in technology AMS 0.35 μm. An operational amplifier based on the adapted current mirror is proposed. Its frequency analysis with large bandwidth is validated with the same technology.
基金supported by the 2011 PhD Programs Foundation of the Ministry of Education of China(No.20110185110003)
文摘In order to reduce the chip area and improve the reliability of HVICs, a new high-voltage level-shifting circuit with an integrated low-voltage power supply, two PMOS active resistors and a current mirror is proposed. The integrated low-voltage power supply not only provides energy for the level-shifting circuit and the logic circuit, but also provides voltage signals for the gates and sources of the PMOS active resistors to ensure that they are normally-on. The normally-on PMOS transistors do not, therefore, need to be fabricated in the depletion process. The current mirror ensures that the level-shifting circuit has a constant current, which can reduce the process error of the high-voltage devices of the circuit. Moreover, an improved RS trigger is also proposed to improve the reliability of the circuit. The proposed level-shifting circuit is analyzed and confirmed by simulation with MEDICI, and the simulation results show that the function is achieved well.
文摘A novel CMOS atto-ampere current mirror （AACM） is proposed which reaches the minimum yet reported current range of 0.4 aA. Operation of this circuit is based on the source voltage modulation instead of the conventionally used gate voltage modulation which interestingly prevents usage of commonly required voltage shifting in those circuits. The proposed circuit has a simple structure prohibiting large chip area consumption which consumes extremely low power of 1.5 μW. It is thus the best choice for ultra low power low voltage （ULPLV） applications. By using a very simple frequency compensation technique, its bandwidth is widened to 15.8 kHz. Simulation results in SMIC （Semiconductor Manufacturing International Corporation） 0.18 μm CMOS technology with Hspice are presented to demonstrate the validation of the proposed current mirror.
文摘讨论了开关电流镜不匹配典型来源,基于开关电流电路采用宽长比定标设计的特性分析了最主要的3个失配参数:跨导、域值电压及亚阈值斜率。采用Hspice平台及0.18 um BSIM3_V3.1 SPICE模型给出了开发了用于仿真的电路模型,针对主要失配因素,分析提取了仿真模型参数并进行了分组。在弱反型和强反型2种运行规则条件下,对失配的情况进行了仿真和分析。对开关电流浮栅电流镜提供的失配补偿能力也进行了仿真验证,并给出2种运行规则失配补偿分析和模拟结果,对单一工作点和较宽动态范围条件下失配补偿效果也进行了对比。
文摘针对配电网发生单相接地故障且分布式电源(distributed generations,DGs)大量接入后,配电网结构和运行方式复杂多变、故障后电气量不明显、故障特征弱等特点,提出一种基于改进局部均值分解(improved local mean decomposition,ILMD)和能量相对熵的主动配电网故障定位方法。首先,利用镜像延拓将信号在两端延拓,消除LMD存在的端点效应,同时,在信号中加入自适应噪声,克服LMD存在的模态混叠问题,对各区段暂态零序电流进行ILMD分解;然后对分解后所有乘积函数(product function,PF)的能量相对熵进行计算,所有PF分量的相对能量熵之和即为区段间的相对能量熵,通过所设置的定位判据,对故障区段进行判断。仿真结果表明,所提算法在10 kV小电流接地系统和改进的IEEE33节点系统中,在不同的仿真条件下故障定位结果准确率高,验证了所提方法的准确性。
