title: A 400 MHz Wireless Neural Signal Processing IC With 625 $\times$ On-Chip Data Reduction and Reconfigurable BFSK/QPSK Transmitter Based on Sequential Injection Locking.
abstract: An 8-channel wireless neural signal processing IC, which can perform real-time spike detection, alignment, and feature extraction, and wireless data transmission is proposed. A reconfigurable BFSK/QPSK transmitter (TX) at MICS/MedRadio band is incorporated to support different data rate requirement. By using an Exponential Component-Polynomial Component (EC-PC) spike processing unit with an incremental principal component analysis (IPCA) engine, the detection of neural spikes with poor SNR is possible while achieving 625× data reduction. For the TX, a dual-channel at 401 MHz and 403.8 MHz are supported by applying sequential injection locked techniques while attaining phase noise of -102 dBc/Hz at 100 kHz offset. From the measurement, error vector magnitude (EVM) of 4.60%/9.55% with power amplifier (PA) output power of -15 dBm is achieved for the QPSK at 8 Mbps and the BFSK at 12.5 kbps. Fabricated in 65 nm CMOS with an active area of 1 mm2, the design consumes a total current of 5  ∼ 5.6 mA with a maximum energy efficiency of 0.7 nJ/b.
authors.forename: Kok-Hin
authors.initials: KH
authors.lastname: Teng
authors.forename: Tong
authors.initials: T
authors.lastname: Wu
authors.forename: Xiayun
authors.initials: X
authors.lastname: Liu
authors.forename: Zhi
authors.initials: Z
authors.lastname: Yang
authors.forename: Chun-Huat
authors.initials: CH
authors.lastname: Heng
mesh_terms: D000200:Action Potentials; D000465:Algorithms; D000669:Amplifiers, Electronic; D011211:Electric Power Supplies; D004867:Equipment Design; D006801:Humans; D009474:Neurons / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted; D059015:Wireless Technology