Y.-H. LiuC.-L. LiTSUNG-HSIEN LIN2018-09-102018-09-102009-10http://scholars.lib.ntu.edu.tw/handle/123456789/352505This paper presents a 400-MHz energy-efficient offset quadrature phase-shift keying (O-QPSK) transmitter for implantable multichannel neural recording applications. Transmitters for these applications must operate at low power while delivering a high data rate. The proposed transmitter incorporates a phase MUX, which directly implements the phase-shift keying operation. The O-QPSK modulation signal is generated by selecting one of the four quadrature phases based on the baseband data via the phase MUX. The power amplifier adopts the inverter-type topology for it is compatible with the quasi-constant-envelope nature of the O-QPSK signal. Implemented in a 0.18- μm CMOS process, the whole transmitter dissipates 2.9 mA from a 1.2-V supply. With a maximum data rate of 17.5 Mb/s, the proposed transmitter achieves an energy efficiency of 200 pJ/bit and is capable of delivering an output power up to -8 dBm. © 2009 IEEE.Neural recording; Offset quadrature phase-shift keying (O-QPSK) modulation; RF transmitter; Wireless telemetry[SDGs]SDG7Base bands; CMOS processs; Constant envelope; Data rates; Energy efficient; High data rate; Low Power; Multi-channel; MUX-Based; Neural recording; Neural recordings; Offset quadrature phase-shift keying (O-QPSK) modulation; Output power; QPSK modulation; RF transmitter; Wireless telemetry; Energy efficiency; Modulation; Phase shift; Power amplifiers; Telemetering equipment; Transmitters; Quadrature phase shift keyingjournal article10.1109/TMTT.2009.20299552-s2.0-70350199619