Title :
A direct digital RF amplitude modulator
Author :
Zhou, Yijun ; Yuan, Jiren
Author_Institution :
Competence Center for Circuit Design, Lund Univ., Sweden
fDate :
6/24/1905 12:00:00 AM
Abstract :
This paper describes a direct digital RF amplitude modulator, which uses a 10-bit linear interpolation current steering digital to analog converter (DAC) and a Gilbert cell mixer to generate an RF amplitude modulated signal directly. The linear interpolation increases the attenuation of the DAC´s image components. The low pass filter (LPF) is eliminated, and the RF transmitter structure can be simplified. This modulator is suitable for realizing the system-on-chip design. The chip has been fabricated in a 0.35 μm, 3.3 V digital CMOS process.
Keywords :
CMOS digital integrated circuits; UHF integrated circuits; UHF mixers; amplitude modulation; application specific integrated circuits; digital-analogue conversion; modulators; radio transmitters; 0.35 micron; 10 bit; 3.3 V; Gilbert cell mixer; RF amplitude modulated signal; RF transmitter structure; digital CMOS process; direct digital RF amplitude modulator; linear interpolation current steering digital to analog converter; system-on-chip design; Amplitude modulation; Attenuation; DC generators; Digital modulation; Digital-analog conversion; Interpolation; Low pass filters; RF signals; Radio frequency; Signal generators;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1009797
