Browsing by Author "Huang, Ru-Yu"

Now showing 1 - 6 of 6

200nA Low Quiescent Current Deep-Standby Mode in 28nm DC-DC Buck Converter for Active Implantable Medical Devices
(2015)
Chu, Li-Cheng
;
Yang, Te-Fu
;
Huang, Ru-Yu
;
Su, Yi-Ping
;
Lin, Chiun-He
the proposed deep-standby mode (DSM) is used in 28nm power management unit (PMU) for long-term usage in active implantable medical devices (AIMD). The PMU can upgrade its normal mode with the proposed embedded auto-cancellation (EAC) technique in order to have high accuracy even if the battery is aging and the PVT variations occur. The test chip fabricated in 28nm CMOS process features low quiescent current of 200nA and output voltage accuracy of 98%. Seamless transition among the DSM and the accurate mode demonstrates both low quiescent current and high accuracy can be achieved in the proposed PMU.
90% Peak Efficiency Single-Inductor-Multiple-Output DC-DC Buck Converter with Output Independent Gate Drive Control
(2015-01-01)
Su, Yi-Ping
;
Lin, Chiun-He
;
Peng, Shen-Yu
;
Huang, Ru-Yu
;
Yang, Te-Fu
A Digital Reverse Current Self-calibration Technique in 90% High Efficiency Rectified Power Supply for Near Field Communication through Magnetic Field Induction
(2017-01-01)
Lin, Li-Chi
;
Chen, Kuan-Yu
;
Yang, Wen-Hau
;
Huang, Ru-Yu
;
Chen, Ke-Horng
it is crucial in near field communication (NFC) controllers for power source transferred from mutual induction of coils when the devices are battery-off. NFC devices can be operated at the condition of low battery or even battery-off due to the requirement of payment any time. Thus, the proposed wireless power transfer (WPT) power supply can have high efficiency due to the remove of reverse leakage current by the digital reverse current self-calibration (DRCS). NFC standards including A, B, and F can be continuously supplied by the WPT supply system. The WPT power supply with the DRCS technique was fabricated in 0.25 mu m CMOS process can rectify AC source from induction of magnetic field to unregulated DC voltage source and to supply power the NFC controller through low dropout regulator (LDR). Moreover, test chip achieves as high as 92% voltage conversion ratio and 89.4 % power conversion efficiency (PCE) due to reduction of unnecessary current loss.
CCM/GM Relative Skip Energy Control and Bidirectional Dynamic Slope Compensation in a Single-Inductor Multiple-Output DC-DC Converter for Wearable Device Power Solution
(2016-08)
Su, Yi-Ping
;
Lin, Chiun-He
;
Yang, Te-Fu
;
Huang, Ru-Yu
;
Chen, Wei-Chung
Compact size wearable devices require multiple supplies with relative large loading difference, which causes serious cross regulation, large ripple, and oscillation in single-inductor multiple-output (SIMO) DC-DC converter. Thus, a continuous conduction mode/green mode (CCM/GM) relative skip energy control (RSEC) in SIMO is proposed for wearable device power solution. Different from the conventional absolute skip method, the RSEC eliminates unnecessary skip-induced voltage ripple and cross regulation with well regulation performance over wide load and voltage ranges. Optimization between efficiency and voltage ripple achieves low noise supply and reduced switching loss. In addition, smooth transition between CCM and GM provides high power and longer usage time in wearable devices. Furthermore, bidirectional dynamic slope compensation conquers subharmonic oscillation and avoids invalid pulses in the energy delivery operation of current-mode SIMO DC-DC converters. The test chip fabricated in the 0.18 mu m CMOS process occupies 2.24 mm(2) active area. Maximum output ripple, overshoot/undershoot, and cross regulation are kept below 40 mV, 27 mV, and 0.0432 mV/mA, respectively.
CCM/GM Relative Skip Energy Control in Single-inductor Multiple-output DC-DC Converter for Wearable Device Power Solution
(2014)
Su, Yi-Ping
;
Lin, Chiun-He
;
Yang, Te-Fu
;
Huang, Ru-Yu
;
Chen, Wei-Chung
Compact size wearable devices require multiple supplies with relative large loading difference, which causes serious cross regulation, large ripple and oscillation in single-inductor multiple-output (SIMO) DC-DC converter. Thus, a continuous conduction mode/green mode (CCM/GM) relative skip energy control (RSEC) in single-inductor multiple-output (SIMO) is proposed for wearable device power solution. Different from conventional absolute skip method, the RSEC eliminates unnecessary skip-induced voltage ripple and cross regulation with well regulation performance over wide load and voltage ranges. Optimization between efficiency and voltage ripple achieves low noise supply and reduced switching loss. Moreover, smooth transition between CCM and GM provides high power and longer usage time in wearable devices. The test chip fabricated in 0.18 mu m CMOS process occupies 2.24mm(2) active area. Maximum output ripple, overshoot/undershoot and cross regulation are kept below 17mV, 27mV and 0.0432mV/mA, respectively.
Implantable Biomedical Device Supplying by a 28nm CMOS Self-Calibration DC-DC Buck Converter with 97% Output Voltage Accuracy
(2015)
Yang, Te-Fu
;
Huang, Ru-Yu
;
Su, Yi-Ping
;
Balakumar
;
Chen, Ke-Horng
Implantable devices like artificial cardiac pacemakers are generally used to control irregular pulses of heart. For 10-year usage, high accuracy supply voltage is essential with the unavoidable aging of the power system to achieve near-natural beat rhythm. A Self-Calibration DC-DC Buck converter (SC-Buck) is proposed to achieve high output voltage accuracy by eliminating offset caused by mismatch of process, voltage and temperature (PVT). Furthermore, the discontinuity which affects transient performance in conventional offset cancellation is also overcome. Large area occupation, which is required to decrease mismatch in conventional operational amplifier, can be largely decreased according to Monte Carlo analysis. Without trimming process, the proposed SC-Buck technique achieves high accuracy for long-term usage (years) and low cost. The test chip fabricated in UMC 28nm CMOS process proves the output voltage accuracy of 97% since the mismatch of error amplifier can be suppressed from 122% to 1%.