A 5.9mW 50Mbps CMOS QPSK/O-QPSK transmitter employing injection locking for direct modulation

Author

Diao, Shengxi ; Zheng, Yuanjin ; Gao, Yuan ; Yuan, Xiaojun ; Je, Minkyu ; Heng, Chun-Huat

Author_Institution

Inst. of Microelectron., A*STAR (Agency for Sci., Technol. & Res.), Singapore, Singapore

fYear

2010

fDate

8-10 Nov. 2010

Firstpage

1

Lastpage

4

Abstract

900MHz QPSK/O-QPSK transmitter suitable for biomedical high quality imaging application is presented. The phase modulation is achieved by directly modifying the self-resonant frequency of a sub-harmonic injection-locked oscillator through capacitor bank switching. Due to the simplicity of the proposed architecture, implemented in 0.18μm CMOS technology, it consumes very low power of 3mW and 5.88mW with 1.2V and 1.4V supply voltages respectively, while transmitting at 50Mbps data rate. The transmitter can deliver output power of -3.3dBm at 1.4V supply with an EVM of 6.6%.

Keywords

CMOS integrated circuits; biomedical imaging; capacitors; injection locked oscillators; phase modulation; quadrature phase shift keying; radio transmitters; CMOS QPSK; O-QPSK transmitter; biomedical imaging; capacitor bank; direct modulation; frequency 900 MHz; high quality imaging; phase modulation; power 5.9 mW; self-resonant frequency; size 0.18 mum; sub-harmonic injection-locked oscillator; voltage 1.2 V; voltage 1.4 V; Capacitors; Frequency modulation; Harmonic analysis; Phase shift keying; Power demand; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid State Circuits Conference (A-SSCC), 2010 IEEE Asian

Conference_Location

Beijing

Print_ISBN

978-1-4244-8300-6

Type

conf

DOI

10.1109/ASSCC.2010.5716551

Filename

5716551