TY - GEN
T1 - A near-optimum 13.56 MHz active rectifier with circuit-delay real-time calibrations for high-current biomedical implants
AU - Huang, Cheng
AU - Kawajiri, Toru
AU - Ishikuro, Hiroki
PY - 2015/11/25
Y1 - 2015/11/25
N2 - This paper presents a 13.56MHz active rectifier with enhanced power conversion efficiency (PCE) and voltage conversion ratio (VCR) for high-current biomedical implants. Near-optimum operation with compensated circuit delays is achieved by the proposed real-time NMOS on/off calibrations, which minimize the reverse current and maximize the transistor conduction time under various process, voltage, temperature and loading conditions. Adaptive sizing (AS) is also introduced to optimize the PCE over a wide loading range. Measurements in TSMC 65nm show more than 36% and 17% improvement in PCE and VCR, respectively, by the proposed techniques. With 2.5V input amplitude, the rectifier achieves a peak PCE of 94.8% with an 80Ω loading, a peak VCR of 98.7% with a 1kΩ loading, and a maximum output power of 248.1mW.
AB - This paper presents a 13.56MHz active rectifier with enhanced power conversion efficiency (PCE) and voltage conversion ratio (VCR) for high-current biomedical implants. Near-optimum operation with compensated circuit delays is achieved by the proposed real-time NMOS on/off calibrations, which minimize the reverse current and maximize the transistor conduction time under various process, voltage, temperature and loading conditions. Adaptive sizing (AS) is also introduced to optimize the PCE over a wide loading range. Measurements in TSMC 65nm show more than 36% and 17% improvement in PCE and VCR, respectively, by the proposed techniques. With 2.5V input amplitude, the rectifier achieves a peak PCE of 94.8% with an 80Ω loading, a peak VCR of 98.7% with a 1kΩ loading, and a maximum output power of 248.1mW.
KW - Active rectifier
KW - adaptive sizing
KW - biomedical implants
KW - circuit delays
KW - conduction time
KW - power conversion efficiency
KW - real-time calibrations
KW - reverse current
KW - voltage conversion ratio
KW - wireless power transfer
UR - http://www.scopus.com/inward/record.url?scp=84959233160&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84959233160&partnerID=8YFLogxK
U2 - 10.1109/CICC.2015.7338391
DO - 10.1109/CICC.2015.7338391
M3 - Conference contribution
AN - SCOPUS:84959233160
SN - 9781479986828
VL - 2015-November
BT - Proceedings of the Custom Integrated Circuits Conference
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE Custom Integrated Circuits Conference, CICC 2015
Y2 - 28 September 2015 through 30 September 2015
ER -