A highly integrated CMOS direct digital RF quadrature modulator

Author

Zhou, Yijun ; Yuan, Jiren

Author_Institution

Dept. of Electrosci., Lund Univ., Sweden

fYear

2003

fDate

16-18 Sept. 2003

Firstpage

573

Lastpage

576

Abstract

A highly integrated CMOS direct digital RF quadrature modulator, consisting of two 10-bit linear interpolation current steering digital-to-analog converters (DACs) and two Gilbert cell based mixers, is described. By employing linear interpolation, the attenuation of the DAC´s image components is significantly increased, and the reconstruction filter is therefore eliminated. The DAC´s differential current signals are directly sent to the mixer, which improves the linearity of the modulated RF signal. Measurement results on operations of 16 QAM and GSM are presented. This structure is suitable for system-on-chip (SOC) design.

Keywords

analogue-digital conversion; mixers (circuits); modulators; quadrature amplitude modulation; radiofrequency integrated circuits; system-on-chip; CMOS; Gilbert cell based mixers; SOC design; differential current signals; digital-to-analog converters; direct digital RF quadrature modulator; linear interpolation; modulated RF signal; reconstruction filter; Attenuation; Digital modulation; Digital-analog conversion; Image reconstruction; Interpolation; Linearity; Nonlinear filters; Quadrature amplitude modulation; RF signals; Radio frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European

Conference_Location

Estoril, Portugal

Print_ISBN

0-7803-7995-0

Type

conf

DOI

10.1109/ESSCIRC.2003.1257200

Filename

1257200