Lianxi Liu

article

A reused chopper/AM mixing amplifier for bio-signals acquisition

Lianxi Liu, Yi Zhang, Junchao Mu, Tianyuan Hua

Analog Integrated Circuits and Signal Processing > 2019 > 99 > 2 > 471-481

Bio-signal audio-transmission schemes require the design of a dedicated audio-modulation circuit to modulate the signal to audio band. In the conventional system, amplification and audio-modulation of the bio-signals are separated. A chopper/AM mixing amplifier is proposed in this paper according to the characteristics of the audio-transmission. The proposed amplifier could implement chopper-modulation...

article

A current-reuse dual-channel bio-signal amplifier for WBAN nodes

Lianxi Liu, Yi Zhang, Yu Song, Zhangming Zhu, more

Microelectronics Journal > 2017 > 70 > C > 52-62

This paper presents a dual-channel low-noise bio-signal amplifier for the low-power wireless body area network (WBAN) nodes. A dual-channel three-input current-reuse (DTCR) structure is proposed to optimize the noise performance of amplifier. The chopper-stabilized technique is employed to reduce 1/f noise and the offset voltage. Moreover, a high input impedance is achieved by using the pre-charge...

article

A 58-ppm/°C 40-nW BGR at Supply From 0.5 V for Energy Harvesting IoT Devices

Junchao Mu, Lianxi Liu, Zhangming Zhu, Yintang Yang

IEEE Transactions on Circuits and Systems II: Express Briefs > 2017 > 64 > 7 > 752 - 756

This brief presents a 40-nW 0.5-V supply voltage and 0.24-V output reference for an energy harvester. The emitter–base voltage of a PNP transistor is divided by the presented switch capacitor circuit to obtain the low output reference. The resistorless proportional-to-absolute-temperature circuit and the low-voltage high-power-supply-rejection-ratio current source are used to improve the accuracy...

article

A low power sub-BGR with multi-curvature self-compensation

Junchao Mu, Lianxi Liu

Analog Integrated Circuits and Signal Processing > 2017 > 92 > 1 > 151-158

This paper proposes a low power sub bandgap reference (sub-BGR) with a novel multi-curvature self-compensation. The proposed circuit generates a curvature-compensation-less reference voltage (V_{REF_NC}), which is compared with the emitter–base voltage of a PNP transistor to generate a pair of complementary curvature currents. The curvature currents are used to compensate the temperature coefficient...

article

A high accuracy CMOS subthreshold voltage reference with offset cancellation and thermal compensation

Lianxi Liu, Yu Song, Junchao Mu, Wei Guo, more

Microelectronics Journal > 2017 > 60 > C > 102-108

This paper presents a high accuracy CMOS subthreshold voltage reference without BJTs for the low-supply-voltage and low-power application. The low supply voltage and low power dissipation are achieved, by making MOSFETs work in the subthreshold region. Besides, the offset scaling down (OSD) technique is proposed for the first time to cancel out the reference voltage variation caused by the offset...

chapter

A 0.5 V, 40nW voltage reference for WBAN devices

Junchao Mu, Lianxi Liu, Zhangming Zhu, Yintang Yang

2016 IEEE Biomedical Circuits and Systems Conference (BioCAS) > 504 - 507

2016 IEEE Biomedical Circuits and Systems Conference (BioCAS)

For WBAN (Wireless Body area network) devices, low supply voltage and high accuracy reference can reduce the power consumption of the whole circuit and prolong the battery life. This paper presents a 40nW, 0.5V supply voltage and 0.24V output reference for WBAN devices. The emitter-base voltage of a PNP transistor is divided by the switch capacitor circuit to obtain the low output reference. The resistor-less...

chapter

A voltage doubling AC-DC converter with offset-controlled comparators for piezoelectric energy harvester

Lianxi Liu, Wei Tu, Junchao Mu, Zhangming Zhu, more

2015 IEEE 11th International Conference on ASIC (ASICON) > 1 - 4

2015 IEEE 11th International Conference on ASIC (ASICON )

A highly efficient active voltage doubling rectifier with wide input range for micro-piezoelectric energy harvesting systems is proposed in this paper. By replacing the passive diodes in Dickson charge pump with offset-controlled comparator-based active counterparts, the proposed rectifier minimizes voltage drop along the conduction path and solves the reverse leakage problem caused by delay and mismatch...

article

A CMOS transimpedance amplifier with high gain and wide dynamic range for optical fiber sensing system

Lianxi Liu, Jiao Zou, Ning Ma, Zhangming Zhu, more

Optik - International Journal for Light and Electron Optics > 2015 > 126 > 15-16 > 1389-1393

For the optical fiber sensing applications, a new CMOS transimpedance amplifier (TIA) with high gain and wide dynamic range has been designed based 0.18μm CMOS process. The TIA proposed consists of three-stage cascade push pull inverter, inductive-series peaking, automatic gain control (AGC) circuit, signal to differential circuit, and output buffer. Three-stage cascade push pull inverter is used...

article

A low distortion CMOS analogue switch with high-order compensation

Maliang Liu, Jingyu Wang, Zhangming Zhu, Wei Guo, more

Analog Integrated Circuits and Signal Processing > 2015 > 82 > 2 > 495-500

A novel bootstrapped analogue switch with high-order harmonic distortion compensation applied in the multiply digital-to-analog convertor (MDAC) of high-speed and high-resolution pipelined analog-to-digital convertor is presented. To diminish inherent harmonic distortion introduced by the bootstrapped switch, the auxiliary circuit is adopted to achieve high-order compensation. Under the appropriate...

article

A 2.1-Channel Class-D Amplifier Exploited Coupling Virtual-Audio-Image to Enhance Stereo

Lianxi Liu, Shijie Deng, Zhangming Zhu, Yintang Yang

IEEE Transactions on Circuits and Systems II: Express Briefs > 2014 > 61 > 5 > 324 - 328

This brief presents a novel 2.1-channel stereo-enhanced class-D audio amplifier to improve the quality of stereophonic sound in portable devices. By a way of cross coupling, the input audio signal from one channel can be amplified at the same time, with different gains in the two channels. The ratio of gains in the two channels can be adjusted by changing the resistance and then making the position...

article

A novel monolithic white LED driver with dual dimming mode

Lianxi Liu, Yue Niu, Jiao Zou, Zhangming Zhu, more

Analog Integrated Circuits and Signal Processing > 2014 > 79 > 1 > 37-44

This paper presents a hysteretic-current-control LED driver with the dual dimming mode. This novel monolithic driver includes an output switch and a high-side output current sensing circuit using an external resistor to set the nominal average output current (I_OUTnom). By applying an external control signal to the DIM pin, it can alter flexibly the control mode between the analog (DC) and switching...

article

A 1.33μW 10-bit 200KS/s SAR ADC with a tri-level based capacitor switching procedure

Zhangming Zhu, Yu Xiao, Weitie Wang, Yuheng Guan, more

Microelectronics Journal > 2013 > 44 > 12 > 1132-1137

A 10-bit successive approximation register (SAR) analog-to-digital converter (ADC) using an energy-efficient tri-level based capacitor switching procedure is presented. The proposed switching procedure achieves 97.66% less switching energy when compared to the conventional method. The number of unit capacitors is reduced by a factor of 4 over that of conventional architecture as well. To make the...

article

The 800-nm diode laser irradiation induces skin collagen synthesis by stimulating TGF-β/Smad signaling pathway

Yongyan Dang, Bei Liu, Lianxi Liu, Xiyun Ye, more

Lasers in Medical Science > 2011 > 26 > 6 > 837-843

The 800-nm diode laser is used clinically for hair removal and leg vein clearance. However, the effects of the laser on skin collagen synthesis have not been established. This study aims to research whether the 800-nm laser can be used for non-ablative rejuvenation and its possible mechanism by using an animal model. Eight 2-month-old rats were irradiated with the 800-nm diode laser at 20, 40, and...

chapter

A data replica replacement algorithm based on value model in mobile grid environments

Xiaodong Yan, Huimin Xu, Yajing Xu, Lianxi Liu

2005 2nd Asia Pacific Conference on Mobile Technology, Applications and Systems > 4 pp. - 4

IEE Mobility Conference 2005. The Second International Conference on Mobile Technology, Applications and Systems

One of the major problems in mobile grid environments is the optimal distribution and replication of data files, in order to improve and maintain a high overall throughput of grid jobs that access files. A data replica replacement algorithm based on value model is proposed and the arithmetic method to calculate replica value is introduced. This algorithm adapts to the high variation environment in...

INFONA - science communication portal

Search results for: Lianxi Liu

A reused chopper/AM mixing amplifier for bio-signals acquisition

A current-reuse dual-channel bio-signal amplifier for WBAN nodes

A 58-ppm/°C 40-nW BGR at Supply From 0.5 V for Energy Harvesting IoT Devices

A low power sub-BGR with multi-curvature self-compensation

A high accuracy CMOS subthreshold voltage reference with offset cancellation and thermal compensation

A 0.5 V, 40nW voltage reference for WBAN devices

A voltage doubling AC-DC converter with offset-controlled comparators for piezoelectric energy harvester

A CMOS transimpedance amplifier with high gain and wide dynamic range for optical fiber sensing system

A low distortion CMOS analogue switch with high-order compensation

A 2.1-Channel Class-D Amplifier Exploited Coupling Virtual-Audio-Image to Enhance Stereo

A novel monolithic white LED driver with dual dimming mode

A 1.33μW 10-bit 200KS/s SAR ADC with a tri-level based capacitor switching procedure

The 800-nm diode laser irradiation induces skin collagen synthesis by stimulating TGF-β/Smad signaling pathway

A data replica replacement algorithm based on value model in mobile grid environments

Filter options

Publication date

Publication type

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Lianxi Liu

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Publication type

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options