Title :
A 1.14mW 750kb/s FM-UWB transmitter with 8-FSK subcarrier modulation
Author :
Fei Chen ; Yu Li ; Deyuan Lin ; Huiying Zhuo ; Woogeun Rhee ; Jongjin Kim ; Dongwook Kim ; Zhihua Wang
Author_Institution :
Inst. of Microelectron., Tsinghua Univ., Beijing, China
Abstract :
A noninvasive energy-efficient FM-UWB transmitter is implemented in 65nm CMOS for stereo hearing aid applications. Different form the conventional FM-UWB transmitter, the proposed transmitter employs an 8-FSK subcarrier modulation method to enhance data rate by three times with slight increment of hardware complexity. The 8-FSK subcarrier modulation is achieved by a fast-settling PLL along with a pre-tuned relaxation VCO. The FM-UWB signal generated by an FLL-assisted ring VCO and a single-stage class AB power amplifier meets the FCC spectrum mask. The 3.5-4GHz 750kb/s transmitter consumes 1.14mW from a 1V supply, achieving an energy efficiency of 1.5nJ/bit.
Keywords :
CMOS integrated circuits; frequency shift keying; hearing aids; phase locked loops; power amplifiers; radio transmitters; ultra wideband technology; voltage-controlled oscillators; 8-FSK subcarrier modulation; CMOS; FCC spectrum mask; FLL-assisted ring VCO; FM-UWB signal; bit rate 750 kbit/s; data rate; energy efficiency; fast-settling PLL; frequency 3.5 GHz to 4 GHz; hardware complexity; noninvasive energy-efficient FM-UWB transmitter; power 1.14 mW; pre-tuned relaxation VCO; single-stage class AB power amplifier; size 65 nm; stereo hearing aid applications; voltage 1 V; Frequency locked loops; Frequency shift keying; Phase locked loops; Transmitters; Voltage-controlled oscillators;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2013 IEEE
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2013.6658523
