INJECTION-LOCKING TECHNIQUES FOR MULTI-CHANNEL ENERGY EFFICIENT TRANSMITTER

Abstract

The recent development of wireless wearable/implantable medical devices, such as wireless ECG and multi-channel neural recording IC, has spurred the need for multi-channel, energy efficient transmitter (TX) with high data rate transmission. In this thesis, two injection locking concepts have been adopted and proposed which made a significant impact on the state-of-the-art TX design. Two projects have been implemented, and chip fabricated with various ultra-low-power modulation techniques for the multi-channel energy efficient TX. A sequential injection-locking (SIL) technique has been studied and employed in the first project such that dual-channel transmission can be performed. In the second project, a new injection-locking technique based on ΔΣ-based injection-locking mechanism is proposed for BFSK modulation such that the TX can support multi-channel transmission and support wider frequency deviation. Both projects have been published in ASSCC conference, IEEE journal transaction on biomedical circuits and systems (TBCAS) and IEEE journal of solid-state circuits (JSSC) papers.