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![Hyun-Su Lee Headshot](https://confcats-catavault.s3.amazonaws.com/CATAVault/ieeecass/master/files/styles/cc_user_photo/s3/user-pictures/70901.jpg?h=28b5c7c2&itok=Ct_DxXCg)
- Affiliation
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AffiliationKorea University
- Country
This paper presents a hybrid load-shift-keying (LSK) system for load-insensitive back telemetry to realize near-constant voltage changes on a primary coil against a wide range of load variations. The hybrid-LSK-enabled full-wave rectifier includes built-in open-coil and short-coil functions for hybrid-LSK modulation. When the load changes from 50 Ω to 50 kΩ, the variation of voltage change levels on the primary coil can be minimized to 60 mV, achieving 88% reduction compared to the conventional short-coil LSK with 510 mV variation. The 180-nm CMOS hybrid-LSK prototype verified that the normalized variation of voltage changes (VARVC) was reduced by 34.1% compared to short-coil LSK. The primary coil voltage changes can be demodulated with slope detection, enabling robust back telemetry against load variations.