Title :
Direct DDFS FM modulator with baseband interpolator
Author :
Bernal, Carlos ; Gaudo, Pilar Molina ; Mediano, Arturo
Author_Institution :
Power Electron. & Microelectron. Group (GEPM), Univ. of Zaragoza, Zaragoza, Spain
fDate :
May 30 2010-June 2 2010
Abstract :
This paper presents a high linearity FM modulator completely based on simple digital blocks. Direct Digital FM modulator (DDFM) has been built using an optimized Direct Digital Frequency Synthesizer (DDFS). High speed linear interpolation has been employed in the DDFS structure allowing to meet the stringent requirements of an analog FM broadcast application. Presented prototype maintains low cost and simplicity. Proper investigation and definition of error sources has been developed to fulfill requirements with the least resource utilization. Experimental results verify high modulation linearity and SINAD performance while maintaining good spectral purity SFDR over all synthesized frequency range.
Keywords :
frequency modulation; frequency synthesizers; interpolation; SINAD performance; baseband interpolator; digital blocks; direct DDFS FM modulator; direct digital frequency synthesizer; spectral purity; Baseband; Chirp modulation; Costs; Digital modulation; Frequency modulation; Frequency synthesizers; Interpolation; Linearity; Prototypes; Resource management;
Conference_Titel :
Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4244-5308-5
Electronic_ISBN :
978-1-4244-5309-2
DOI :
10.1109/ISCAS.2010.5538015
