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

fYear

2010

fDate

May 30 2010-June 2 2010

Firstpage

3000

Lastpage

3003

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISCAS.2010.5538015

Filename

5538015