Browsing by Author "Hsieh, Chun-Yu"

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A 1-V, 16.9 ppm/degrees C, 250 nA Switched-Capacitor CMOS Voltage Reference
(2011-04-01)
Hsieh, Chun-Yu
;
Huang, Hong-Wei
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
An ultra low-power, precise voltage reference using a switched-capacitor technique in 0.35-mu m CMOS is presented in this paper. The temperature dependence of the carrier mobility and channel length modulation effect can be effectively minimized by using 3.3 and 5V N-type transistors to operate in the saturation and subthreshold regions, respectively. In place of resistors, a precise reference voltage with flexible trimming capability is achieved by using capacitors. When the supply voltage is 1 V and the temperature is 80 degrees C, the supply current is 250 nA. The line sensitivity is 0.76%/V; the PSRR is -41 dB at 100 Hz and -17 dB at 10 MHz. Moreover, the occupied die area is 0.049 mm(2).
A 80V Output Voltage Boost Converter with Low Voltage Ripple for Avalanche Photodiode(APD)
(2011)
Yang, Yao-Yi
;
Hsieh, Chun-Yu
;
Huang, Tzu-Chi
;
Lee, Yu-Huei
;
Wang, Shih-Wei
The Avalanche Photodiodes (APDs) are widely used in a variety of optical application requiring high sensitivity, such as long-distance optical communication and optical distance measurement, because the APDs can detect the low level light. APDs accompanied with the Transimpedance Amplifier (TIA) are utilized on the receiver side in the communication system. The trend of integrating the active optical components faces the challenge of integrating different voltage levels. In general, the operation voltage of TIA is usually 1.8 V or 3.3 V. However, the APD requires a high reverse-biasing voltage of 40 V - 80 V. Therefore, a high conversation-ratio boost converter must be included to provide the high voltage to bias the APD. Besides, output voltage ripple must be minimized to decrease the influence on communication signals. Experimental results show the 80 V output voltage boosted from the input voltage of 2.5 V. The output voltage ripple is 2 mV under the condition of 1 mA load current.
A Battery-Free 217 nW Static Control Power Buck Converter for Wireless RF Energy Harvesting With alpha-Calibrated Dynamic On/Off Time and Adaptive Phase Lead Control
(2012-04-01)
Huang, Tzu-Chi
;
Hsieh, Chun-Yu
;
Yang, Yao-Yi
;
Lee, Yu-Huei
;
Kang, Yu-Chai
Abattery-free nano-power buck converter with a proposed dynamic on/off time (DOOT) control can achieve high conversion efficiency over a wide load range. The DOOT control can predict the on/off time at different input voltages without a power consuming zero current detection (ZCD) circuit, as well as suppress static power in idle periods. To adapt to the fluctuations in a harvesting system, the proposed alpha-calibration scheme guarantees accurate ZCD over process, voltage variation, and temperature (PVT) in the DOOT to improve power conversion efficiency. Furthermore, the adaptive phase lead (APL) mechanism can improve inherent propagation delay attributable to low-power and non-ideal comparator, thus improving load regulation by a maximum of 30 mV. The test chip was implemented in 0.25-mu m CMOS process with a die area of 0.39 mm(2). Experimental results showed 95% peak efficiency, low static power of 217 nW and good load regulation of 0.1 mV/mA, which are suitable for RF energy harvesting applications.
A Charge-Recycling Buck-Store and Boost-Restore (BSBR) Technique With Dual Outputs for RGB LED Backlight and Flashlight Module
(2009-08-01)
Hsieh, Chun-Yu
;
Yang, Chih-Yu
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A boost converter with buck-store and boost-restore (BSBR) technique fabricated by 0.25 mu m CMOS BCD process can provide different supply voltages to drive series red, green, and blue LEDs in sequence for reducing the power consumption on the constant current generator. The proposed technique not only stores and restores extra energy during the transient time of the reference tracking response to improve the efficiency but also enhances the reference tracking response to greatly reduce load transition time. Experimental results show that the period of reference tracking response can be improved. When the load current is 100 mA, the periods of reference down-tracking and up-tracking are smaller than 10 and 20 mu s, respectively. Furthermore, this technique can also provide a regulated voltage to drive the subblock implemented in the liquid crystal display system. The maximum efficiency of charge recycling is up to 94%, and the maximum efficiency of this boost converter is 94.5%. Experimental results demonstrate fast and efficient reference tracking performance is achieved by the proposed BSBR technique.
A Charge-Reservoir with Buck-Store and Boost-Restore (BSBR) Technique for High Efficient Conversion and Low Cost Solution of RGB LED Display Panels
(2009)
Hsieh, Chun-Yu
;
Yang, Chih-Yu
;
Huang, Ming-Hsin
;
Li, Don-Hwan
;
Chen, Chi-Lin
A boost converter with buck-store and boost-restore (BSBR) technique fabricated by 0.25 mu m CMOS BCD process can provide different supply voltages to drive series RGB LEDs in sequence for reducing the power consumption on the constant current generator. The proposed technique not only stores and restores extra charge during the transient time of the reference tracking response to improve the efficiency but also enhances the reference tracking response to greatly reduce load transition time. Experimental results show that the period of reference-tracking response can be improved. When the load current is 100mA, the periods of reference down-tracking and up-tracking are smaller than lops and 20 mu s, respectively. Furthermore, this technique also can provide a regulated voltage to drive the sub-block implemented in the LCD system. The maximum efficiency of charge recycling is up to 94% and the maximum efficiency of this boost converter is 92.5%. Experimental results demonstrate fast and efficient reference tracking performance is achieved by the proposed BSBR technique.
A dual phase charge pump with compact size
(2007-01-01)
Hsieh, Chun-Yu
;
Fan, Po-Chin
;
Chen, Ke-Horng
;
交大名義發表
;
National Chiao Tung University
In this paper, the regulated dual phase charge pump with compact size is presented. This charge pump uses the dual phase technique to reduce the output ripple and proposes a new power stage to define the stability of the overall system. This charge pump provides output voltage 5V and maximum load current 50mA with the constant frequency regulation. This design is based on TSMC 0.35 mu m 3.3V/5V CMOS technology.
A dual phase charge pump with compact size
(2007-01-01)
Hsieh, Chun-Yu
;
Fan, Po-Chin
;
Chen, Ke-Horng
;
交大名義發表
;
National Chiao Tung University
In this paper, the regulated dual phase charge pump with compact size is presented. This charge pump uses the dual phase technique to reduce the output ripple and proposes a new power stage to define the stability of the overall system. This charge pump provides output voltage 5V and maximum load current 50mA with the constant frequency regulation. This design is based on TSMC 0.35 mu m 3.3V/5V CMOS technology.
A dual-phase charge pump circuit with compact size
(2010-07-01)
Huang, Ming-Hsin
;
Hsieh, Chun-Yu
;
Fan, Po-Chin
;
Chen, Ke-Horng
;
電控工程研究所
In this paper, a regulated dual-phase charge pump with compact size is presented. By means of a nano-ampere switched-capacitor voltage reference (SCVR) circuit, the dual-phase charge pump regulator can reduce the quiescent current and the output ripple. Besides, a new power stage is proposed to define the stability of the overall system. Owing to the design of buffer stage, the charge pump regulator can extend bandwidth and increase phase margin. Thus, the transient response and driving capability can be improved. Beside, the proposed automatic body switching circuit can efficiently drive the bulk of the power p-type MOSFETs to avoid leakage and potential latch-up. This chip was fabricated by TSMC 0.35 mu m, 3.3 V/5 V 2P4 M CMOS technology. The input voltage range varies from 2.9 to 4.9 V for the lithium battery and the output voltage is regulated at 5 V. Experimental results demonstrate the charge pump can provide 50 mA maximum load current without any oscillation problems.
A DVS Embedded Power Management for High Efficiency Integrated SoC in UWB System
(2009)
Lee, Yu-Huei
;
Wang, Shih-Jung
;
Yang, Yao-Yi
;
Zheng, Kuo-Lin
;
Chen, Po-Fung
The proposed power management module with 1 V low-voltage PWM controller and dynamic self-biasing mechanism is designed to integrate with ultra-wide band (UWB) system. The on-chip pre-regulator with power conditioning circuit provides a constant and noiseless supply voltage. Instead of using large external compensation circuit, the compensation enhancement multistage amplifier increases system loop gain and stabilizes the system. Moreover, the proposed self-biasing mechanism enhances the power conversion efficiency by 4 % through the handover technique. The fabricated power management module occupies 0.356 mm(2) silicon in 65nm CMOS. With the excellent line/load transient response and the highest efficiency about 93.5%, the proposed power management has the qualification to be integrated in today's system-on-chip (SoC) applications.
A DVS Embedded Power Management for High Efficiency Integrated SoC in UWB System
(2010-11-01)
Lee, Yu-Huei
;
Yang, Yao-Yi
;
Chen, Ke-Horng
;
Lin, Ying-Hsi
;
Wang, Shih-Jung
The proposed power management module with a typical 1.2 V low-voltage PWM (LV-PWM) controller and dynamic voltage scaling (DVS) function is designed using 65 nm technology for integration with the ultra-wide band (UWB) system. The on-chip pre-regulator with a power conditioning circuit can provide a regulated supply voltage to the LV-controller. Moreover, the proposed handover technique can achieve the self-biasing mechanism to further reduce power dissipation. To operate in low voltage, the proposed compensation enhancement multistage amplifier (CEMA) can achieve high loop gain and ensure system stability without using any external compensation component. The fabricated power management module occupies 0.356 mm(2) silicon area with an excellent line/load transient response. Owing to the DVS function, the proposed power management can meet the power requirement in the UWB system and other RF transceiver systems.
A High Efficiency and Compact Size 65nm Power Management Module with 1.2V Low-Voltage PWM Controller for UWB System Application
(2009)
Lee, Yu-Huei
;
Wang, Shih-Jung
;
Yang, Yao-Yi
;
Zheng, Kuo-Lin
;
Chen, Po-Fung
This 65 nm power management module with 1.2 V low-voltage PWM controller aims to integrate with ultra-wideband (UWB) system to get high efficiency and compact size. The on-chip pre-regulator with power conditioning circuit provides a constant and noiseless supply voltage. Thus, the voltage variation of battery has less effect on the low-voltage PWM controller. The proposed compensation enhancement multistage amplifier (CEMA) increases system loop gain and stabilizes the system without off-chip compensation circuit. With excellent line/load transient response, the proposed power management has the highest efficiency about 92% and 0.995 mm(2) silicon die area.
A Li-Ion Battery Charger With Smooth Control Circuit and Built-In Resistance Compensator for Achieving Stable and Fast Charging
(2010-02-01)
Lin, Chia-Hsiang
;
Hsieh, Chun-Yu
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A built-in resistance compensator (BRC) technique is presented to speed up the charging time of a lithium-ion battery. A smooth control circuit (SCC) is proposed to ensure the stable transition from the constant-current (CC) to the constant-voltage (CV) stage. Due to the external parasitic resistance of the Li-ion battery-pack system, the charger circuit switches from the CC to the CV stage without fully charging the cell. The BRC technique dynamically estimates the external resistance to extend the CC stage. The experimental results show that the period of the CC stage can be extended to 40% of that of the original design. The charging time is effectively reduced.
A Low-Dropout Regulator With Smooth Peak Current Control Topology for Overcurrent Protection
(2010-06-01)
Hsieh, Chun-Yu
;
Yang, Chih-Yu
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
The proposed low-dropout (LDO) regulator with a smooth peak current control (SPCC) circuit can be simultaneously controlled by using an error amplifier to regulate output voltage and a peak current controller as a means to limit its current level. The SPCC circuit can be switched smoothly between these two control mechanisms by detecting the information of load current and the dropout voltage. Measured results show that overcurrent protection can make the pass device operate as a current source while the load current exceed the peak current level. Moreover, the control mechanism can return to error amplifier control when load current becomes smaller than the limiting current, thus ensuring output voltage to be close to the rated value. Output voltage is stable and varies smaller than 15 mV when a 160 mA load current step or a 2 V supply voltage step is placed on this LDO regulator.
A novel precise step-shaped soft-start technique for integrated DC-DC converter
(2007)
Hsieh, Chun-Yu
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Chuang, Yung-Chun
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Chen, Ke-Horng
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電控工程研究所
;
Institute of Electrical and Control Engineering
The advantages of this novel precise step-shaped soft-start technique for integrated dc-dc converter are not only owning excellent constant peak current limiting capacity for any load conditions to diminish initial inrush current powerfully but also solving the over-voltage or drop-voltage problem during the changing between the start-up mode and normal operation. Furthermore, the on-chip design for this technology reduces the numbers of the external I/O pin to decrease the cost of the converter. Therefore, this novel soft-start technique is more available and smoother for integrated dc-dc converter than the conventional soft-start technique.
A Photovoltaic System with Analog Maximum Power Point Tracking and Grid-Synchronous Control
(2012)
Huang, Tzu-Chi
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Lee, Yu-Huei
;
Du, Ming-Jhe
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Hsieh, Chun-Yu
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Yang, Chih-Yu
A low cost maximum power point tracking (MPPT) technique is proposed in this paper for high power efficiency in photovoltaic systems to track the maximum power point (MPP). Compared to the various studies of the MPPT topologies, the proposed implementation is achieved by monitoring the power slope conditions of solar panels. The post grid-connected DC-AC inverter helps feedback the transformative power for providing AC power. Experiment results demonstrate the rapid tracking operation of MPP and a high tracking effectiveness of 97.3%.
A Single-Inductor Bipolar-Output Converter with 5 mV Positive Voltage Ripple for Active Matrix OLED
(2011)
Chen, Wei-Chung
;
Chiu, Chao-Chang
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Hsieh, Chun-Yu
;
Huang, Tzu-Chi
;
Lee, Yu-Huei
This paper proposed a single inductor bipolar outputs (SIBO) switching converter for the active matrix Organic Light-Emitting Diode (AMOLED). The negative voltage is generated by the inverting buck-boost converter, which is regulated by the high signal-to-noise ratio comparator. Moreover, the boost converter is utilized to provide the positive output voltage. The proposed switching converter uses the switch sequential to reduce the positive voltage ripple to about 5 mV with the proportional-integral (PI) compensator to guarantee good line and load-regulation. Simulation results show the positive output voltage is regulated to 5V and the negative output voltage is -7V for driving the AMOLED. When the load current is 25 mA and the ESR is 30m Omega, the output voltage ripples are equal to 5 mV and 11 mV for positive and negative voltages, respectively. Besides, the load and line regulations of positive output voltage are 0.24 mV/mA and 5 mV/V, respectively. The maximum efficiency is 88.5% when the input voltage is 4.5 V and the load current is 50mA
Adaptive frequency control technique for enhancing transient performance of DC-DC converters
(2007)
Huang, Hong-Wei
;
Hsieh, Chun-Yu
;
Chen, Ke-Horng
;
Kuo, Sy-Yen
;
電控工程研究所
An adaptive frequency control (AFC) technique is proposed for minimizing transient dropout voltage and response time of switching DC-DC converters. As we know, nonlinear fast-transient techniques with fixed switching frequency can effectively regulate the unstable output voltage back to steady-state within a short time. However, they suffer from oscillation problem because of large sourcing or sinking recovery current at output of error amplifier by fast transient circuit. Therefore, linear operation provided by AFC technique can dynamically and smoothly adjust the switching frequency, which is proportional to the output voltage variation, to regulate output voltage back to its steady-state value. In other words, AFC technique eliminates system and sub-harmonic oscillation scenarios. Experimental results demonstrate the transient dropout voltage is improved 37.8% when load current changes from 100 mA to 500 mA.
Adaptive Pole-Zero Position (APZP) Technique of Regulated Power Supply for Improving SNR
(2008-11-01)
Hsieh, Chun-Yu
;
Chen, Ke-Horng
;
交大名義發表
;
National Chiao Tung University
This paper proposes an adaptive pole-zero position (APZP) technique to achieve excellent transient response of de-de converters. The APZP technique triggers the two-step nonlinear control mechanism to speed up the transient response at the beginning of load variations. Before the output voltage is regulated back to its voltage level, the APZP technique merely functions as a linear control method to regulate output voltage in order to ensure the stability of the system. Fast transient response time, low output ripples, and stable transient operation are achieved at the same time by the proposed APZP technique. Experimental results in the UMC 0.18-mu m, process show that the transient undershoot/overshoot voltage and the recovery time do not exceed 48 mV and 10 mu s, respectively. Compared with conventional design without any fast: transient technique, the performances of overshoot voltage and recovery time are enhanced by 37.2% and 77.8%. With the APZP technique, the performance of dc-dc converters is improved significantly.
An Energy-Recycling (ER) Technique for Field Color Sequential LCD Backlight Driving
(2009)
Huang, Ming-Hsin
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Tsai, Yueh-Chang
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Hsieh, Chun-Yu
;
Chen, Ke-Horng
;
電控工程研究所
An energy-recycling (ER) technique has been proposed to implement high power conversion efficiency and low cost solution of field color sequential (FCS) LEDs backlight driving. One recycling capacitor C(R) and one power-transistor M(R) are added to synchronous boost converter to compose the ER function. When the output voltage of FCS-LEDs backlight driver switches from 40V to 26V for driving RGB LEDs during related time interval, ER technique stops to boost input voltage and switches to recycle energy from output terminal to the recycling capacitor CR. Thus, the output voltage can be rapidly switched between two different voltage levels with minimum power losses. The proposed ER technique has been fabricated by TSMC 40V BCD process. The experimental results demonstrate fast and efficient output voltage tracking performance is achieved by the proposed ER technique.
Boost DC-DC Converter with Charge-Recycling (CR) and Fast Reference Tracking (FRT) Techniques for High-Efficiency and Low-Cost LED Driver
(2008)
Hsieh, Chun-Yu
;
Chen, Ke-Horng
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電控工程研究所
;
Institute of Electrical and Control Engineering
A charge-recycling (CR) technique and fast reference tracking (DRT) are proposed for implementing a high efficiency and low cost RGB backlight module in color sequential notebook computers' display. A RGB LED driver composed of an asynchronous 1.5MHz DC/DC boost converter with FRT and CR techniques was fabricated in TSMC 0.25 mu m BCD 40V to generate 17V for 6-series red LEDs or 21V for 6-series green, or blue LEDs. The CR technique stores extra energy at the output node when the output voltage is switched from low to high voltage level and releases the reserved energy back to the output node at next period. Furthermore, the output voltage can be rapidly switched between two different voltage levels by FRT technique without wasting much power owing to the CR technique.