Title :
A 2.4 GHz direct conversion transmitter for Wimax applications
Author_Institution :
Analog Devices Inc., Wilmington, MA
Abstract :
The evolving 802.16 WiMax and WiBro standards offer the possibility of high data rate wireless access for home and business users. The first generation systems are currently being designed and deployed in the licensed frequency bands centered around 2.5GHz and 3.5GHz. The use of high data rate OFDM modulations translates into challenging requirements for the transmitter in terms of spectral quality and EVM. In particular, this calls for low distortion, good signal balance and low phase error. This article focuses on the challenges and advantages associated with implementing a direct conversion transmitter in the Wibro band centered at 2.35GHz. A complete mixed signal implementation that includes a dual DAC, IQ modulator, LO synthesizer, variable gain amplifier and RF power detector is presented along with system-level measured results
Keywords :
IEEE standards; OFDM modulation; UHF power amplifiers; WiMax; microwave power amplifiers; mixed analogue-digital integrated circuits; radio transmitters; 2.35 GHz; 2.4 GHz; 2.5 GHz; 3.5 GHz; 802.16 WiMax standards; IQ modulator; LO synthesizer; OFDM modulations; RF power detector; WiBro standards; direct conversion transmitter; dual DAC; mixed signal circuit; variable gain amplifier; wireless access; Gain; OFDM modulation; Phase distortion; Power amplifiers; RF signals; Radio frequency; Radiofrequency amplifiers; Synthesizers; Transmitters; WiMAX;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2006 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9572-7
DOI :
10.1109/RFIC.2006.1651176
