A narrow band high-resolution synthesizer using a direct digital synthesizer followed by repeated dividing and mixing

Author

Karlquist, Richard

Author_Institution

Hewlett-Packard Co., Santa Clara, CA, USA

fYear

1995

fDate

31 May-2 Jun 1995

Firstpage

217

Lastpage

235

Abstract

A synthesizer is described that generates a narrow band of frequencies around 10 MHz with extremely small step size and high spectral purity. A DDS running at 667 kHz is upconverted to 10.667 MHz and divided back to 667 kHz several times to improve the resolution and spurious suppression of the DDS. The final 10.667 MHz offset frequency is then mixed with 667 kHz resulting in a 10 MHz output. The post mixer filtering is done with inexpensive 10.7 MHz ceramic filters of the type used in FM broadcast receivers

Keywords

band-pass filters; circuit stability; circuit tuning; crystal filters; direct digital synthesis; frequency dividers; frequency modulation; radiofrequency filters; 10 to 10.7 MHz; 667 kHz; DDS; ceramic filters; direct digital synthesizer; dividing; high spectral purity; high-resolution synthesizer; mixing; narrowband synthesizer; post mixer filtering; Broadcasting; Ceramics; Clocks; Digital modulation; Filtering; Filters; Frequency conversion; Frequency synthesizers; Metrology; Narrowband;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium, 1995. 49th., Proceedings of the 1995 IEEE International

Conference_Location

San Francisco, CA

Print_ISBN

0-7803-2500-1

Type

conf

DOI

10.1109/FREQ.1995.483906

Filename

483906