A 0.65V 1.2mW 2.4GHz/400MHz dual-mode phase modulator for mobile healthcare applications

Author

Yang Li ; Ni Xu ; Yining Zhang ; Woogeun Rhee ; Sanghoon Kang ; Zhihua Wang

Author_Institution

Inst. of Microelectron., Tsinghua Univ., Beijing, China

fYear

2014

fDate

10-12 Nov. 2014

Firstpage

261

Lastpage

264

Abstract

A 0.65V 2.4GHz/400MHz digital-intensive phase modulator is implemented in 65nm CMOS. In ultra-low voltage design, the two-point modulator suffers a lot from the DCO nonlinearity. In this work, we employ a 2.4GHz semidigital fractional-N PLL with an FIR filter embedded 1-bit high-pass modulation to overcome the nonlinearity problem in the conventional two-point modulator. The 400MHz modulator performs an FIR-embedded OQPSK modulation to reduce the spectral regrowth in high frequencies. For compact area and low voltage design, an inverter based phase interpolator with a harmonic filtering technique is designed after generating multiphase signals directly from the 2.4GHz output. The 1Mb/s GFSK 2.4GHz and the 10Mb/s OQPSK 400MHz modulators consume 0.94mW and 1.2mW and achieve the EVM values of 5.7% and 6.4% respectively.

Keywords

CMOS integrated circuits; FIR filters; body area networks; mobile communication; quadrature phase shift keying; CMOS; DCO nonlinearity; FIR filter; FIR-embedded OQPSK modulation; digital-intensive phase modulator; dual-mode phase modulator; frequency 2.4 GHz; frequency 400 MHz; harmonic filtering technique; mobile healthcare applications; phase interpolator; power 1.2 mW; semidigital fractional-N PLL; size 65 nm; spectral regrowth; voltage 0.65 V; Finite impulse response filters; Frequency modulation; Inverters; Phase locked loops; Phase modulation; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference (A-SSCC), 2014 IEEE Asian

Conference_Location

KaoHsiung

Print_ISBN

978-1-4799-4090-5

Type

conf

DOI

10.1109/ASSCC.2014.7008910

Filename

7008910