TY - GEN
T1 - A 200.2-mW Wireless Power Transfer System with Hybrid SC-/RC-LSK and Triple Regulated Outputs Achieving 66.1% E2E Efficiency
AU - Lu, T.
AU - Du, S.
N1 - Green Open Access added to TU Delft Institutional Repository as part of the Taverne amendment. More information about this copyright law amendment can be found at https://www.openaccess.nl. Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
PY - 2025
Y1 - 2025
N2 - This paper presents a 6.78-MHz wireless power transfer (WPT) system for implantable biomedical devices. The receiver (RX) features a compact single-stage triple-output rectifier that delivers three regulated DC outputs (1V, 2V, and 3 V) using only two power transistors and two buffer capacitors. A novel load-shift-keying (LSK) technique, hybridizing the shortcircuit (SC) LSK and resistive-circuit (RC) LSK, is proposed, achieving low-loss power-data backscattering and fully integrated global power regulation between the RX and transmitter (TX) chips. TX and RX chips were designed and fabricated in a 180-nm BCD process. Measurement results show that the system provides three regulated DC outputs at 1V, 2V, and 3V, respectively, with unnoticeable cross-regulations and load transients. Supplied by a 3.3-V input at TX, it achieves 200.2 mW peak output power, 66.1% peak end-to-end (E2E) power efficiency, and up to 27.3% E2E-efficiency enhancement thanks to global power regulation.
AB - This paper presents a 6.78-MHz wireless power transfer (WPT) system for implantable biomedical devices. The receiver (RX) features a compact single-stage triple-output rectifier that delivers three regulated DC outputs (1V, 2V, and 3 V) using only two power transistors and two buffer capacitors. A novel load-shift-keying (LSK) technique, hybridizing the shortcircuit (SC) LSK and resistive-circuit (RC) LSK, is proposed, achieving low-loss power-data backscattering and fully integrated global power regulation between the RX and transmitter (TX) chips. TX and RX chips were designed and fabricated in a 180-nm BCD process. Measurement results show that the system provides three regulated DC outputs at 1V, 2V, and 3V, respectively, with unnoticeable cross-regulations and load transients. Supplied by a 3.3-V input at TX, it achieves 200.2 mW peak output power, 66.1% peak end-to-end (E2E) power efficiency, and up to 27.3% E2E-efficiency enhancement thanks to global power regulation.
KW - Wireless power transfer (WPT)
KW - biomedical implantable devices
KW - triple-output regulation
KW - hybrid load-shiftkeying (LSK) backscattering
KW - global power regulation
UR - http://www.scopus.com/inward/record.url?scp=105024558930&partnerID=8YFLogxK
U2 - 10.1109/ESSERC66193.2025.11214129
DO - 10.1109/ESSERC66193.2025.11214129
M3 - Conference contribution
SN - 979-8-3315-2540-8
T3 - European Solid-State Circuits Conference
SP - 77
EP - 80
BT - Proceedings of the 2025 IEEE European Solid-State Electronics Research Conference (ESSERC)
PB - IEEE
T2 - 2025 IEEE European Solid-State Electronics Research Conference (ESSERC)
Y2 - 8 September 2025 through 11 September 2025
ER -