A Synthetic‒Ripple Interleaving Technique with Adaptive-Extended TON Controlled (AETC) Two Phase Buck Converter Achieving Fast Load Response
發表編號：O10-1時間：11:10 - 11:25 |
論文編號：0219
Cheng-Yang Hong, Chieh-Ju Tsai, and Ching-Jan Chen
Graduate Institute of Electrical Engineering, National Taiwan University.
This digest proposes a synthetic ripple based phase-interleaving technique for multiphase constant on-time (COT) buck converter. When step-up load transient occurs, the proposed technique can automatically turn on two phases immediately to recover the energy loss without any user pre-defined load transient threshold voltage. Two-phase on-time periods linearly overlap to reduce the output voltage deviation and output capacitance requirement. Besides, an adaptive-extended TON control (AETC) mechanism is adopted to overcome the steady state switching frequency variation caused by parasitic resistances. A two phase buck converter is realized in a 0.18 µm CMOS process to verify these two techniques. The experimental results show that the phase-interleaving technique and AETC are suitable for a 12 MHz high switching frequency operation. The measured results show that, during 1 A load current step changes with 1 A/µs slew rate, the converter is able to regulate the output voltage from within 0.6 µs with less than 45 mV undershoot while the output capacitor is only 1 µF.
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Electromagnetic Energy Harvester Interface Design For Wearable Applications
發表編號：O10-2時間：11:25 - 11:40 |
論文編號：0210
Shih-Wei Wang, Yi-Wen Ke, Po-Chiun Huang and Ping-Hsuan Hsieh
Department of Electrical Engineering, National Tsing Hua University
* Abstract is not available.
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A Low-EMI Continuous-Time Delta-Sigma-Modulation Buck Converter With Transient-Enhanced Technique
發表編號：O10-3時間：11:40 - 11:55 |
論文編號：0014
Yuh-Shyan Hwang1, Ming-Chun Hsu1 and Dong-Shiuh Wu2
1Department of Electronic Engineering, National Taipei University of Technology
2Department of Electronic Engineering, Lunghwa University of Science and Technology
This paper presents a continuous-time delta-sigma-modulation (CT-DSM) and transient-enhanced-technique buck converter that features an integral loop filter with a superiority of oversampling and noise shaping for effective spurious-noise reduction. Furthermore, the transient-enhanced technique uses a dynamic current to accelerate the transient response. Thus, the proposed buck converter maintains a low spurious noise, low complex, and fast transient response. The buck converter is fabricated in TSMC 0.35um 2P4M CMOS process with a chip area of 1.23mm × 1.42mm. The measurement results show that the transient recovery time is 4us, 2us, and the undershoot, overshoot voltage is 30mV, 20mV, when the load current changes from 50mA to 500mA and from 500mA to 50mA. The output spectrum with a noise floor below -66dBm was obtained across all sampling frequencies. The max power efficiency is 91.4%, when the load current is 150mA and output voltage is 2.4V.
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A Hybrid Supply Modulator for 10-MHz LTE Power Amplifier with 17.3% PAE Improvement
發表編號：O10-4時間：11:55 - 12:10 |
論文編號：0035
Yen-Ting Chen, Mao-Ling Chiu, How-Wei Teng and Tsung-Hsien Lin
Graduate Institute of Electronics Engineering, National Taiwan University
A hybrid supply modulator (HSM) is proposed for the envelope-tracking power amplifier (ET-PA) to improve its power-added efficiency (PAE). The proposed HSM consists of a linear amplifier (LA) and a switching amplifier (SA). The LA adopts a current-recycling OTA (CROTA) followed by an IQ-controlled class-AB output stage. The CROTA enhances gain and slew rate of the LA first stage. In the class-AB output stage, the quiescent current (IQ) is regulated to reduce its sensitivity to process and supply variations. The SA employs a zero-peaked hysteresis comparator for switching control which helps to reduce time delay of the SA control loop, and leads to better power efficiency. Measurement results shows that the HSM reaches 75.2% efficiency at 29.3-dBm output power. When tested with a commercial PA, the PAE improves by 17.3% at 22-dBm RF output power with 34.9-dB power gain.
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