A 0.25 mm2 BLE Transmitter with Direct Antenna Interface and 19% System Efficiency Using Duty-Cycled Edge-Timing Calibration
- Resource Type
- Conference
- Authors
- Sun, Zheng; Xu, Dingxin; Qiu, Junjun; Liu, Zezheng; Zhang, Yuncheng; Huang, Hongye; Liu, Hanli; Liu, Bangan; Li, Zheng; Pang, Jian; Shirane, Atsushi; Okada, Kenichi
- Source
- ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference (ESSCIRC) Solid State Circuits Conference (ESSCIRC), ESSCIRC 2021 - IEEE 47th European. :499-502 Sep, 2021
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Fields, Waves and Electromagnetics
Photonics and Electrooptics
Signal Processing and Analysis
Ring oscillators
Power demand
Transmitting antennas
Modulation
Transformers
System-on-chip
Calibration
BLE
transmitter
DPLL
spurious emission
phase mismatch
calibration
- Language
This paper demonstrates a compact BLE transmitter (TX) achieving fully on-chip integration and high system-efficiency. This BLE TX is constructed based on a 1.2 GHz 8-phases current-reused ring oscillator (RO) with a digital phase-locked loop (PLL). To mitigate the spurious emission, including HD2 caused by phase mismatches, an edge-timing calibration is proposed by reusing the digital PLL in this paper. A transformer-based Class-D PA with implicit LC-notch is implemented to improve the system efficiency with higher harmonic suppression for both HD2 and HD3 with a compact on-chip area. The presented TX supports both 1 Mbps and 2 Mbps GFSK modulation with low power consumption.