(A) 2.4-GHz ternary sequence spread spectrum OOK transceiver with spur suppression and dual-mode detection architecture for reliable and low power body area networking

Abstract

A novel 2.4-GHz Ternary Sequence Spread Spectrum (TSSS)-OOK Transceiver with spur suppression and dual-mode detection architecture is presented for the ULP wearable applications. A proposed TSSS-OOK TX supports spreading spectrum and dual reception of the coherent as well as non-coherent mode. A random bi-phase switching of 0 and 180 degree at PA suppresses the intrinsic spur of spread spectrum OOK TX. Also, both the fractional-N Phase Locked Loop (PLL) and frequency locked loop (FLL) are integrated to a single VCO as a dual-precision frequency synthesizer in terms of performance and power optimization. The single-chip trans-ceiver in 90nm CMOS measures 1Mcps, 22 dB spur-suppressed output spectrum and 5.5% EVM, while dissipat-ing 2.17mW.