DocumentCode
375655
Title
Phase decrement type direct frequency synthesizer driven by a DDS
Author
Tajima, K. ; Tsuru, H. ; Ikematsu, H. ; Itoh, K. ; Isota, Y. ; Ishida, O.
Author_Institution
Mitsubishi Electr. Corp., Kanagawa, Japan
Volume
2
fYear
2001
fDate
20-24 May 2001
Firstpage
709
Abstract
A phase decrement type direct frequency synthesizer with a quadrature mixer driven by a DDS is presented. Phase decrement of a DDS signal can increase the bandwidth of the direct synthesizer. Overflow of a DDS is employed to achieve phase decrement of the signal without adding an extra circuit. A developed 2 GHz-band synthesizer with sub Hz order frequency step achieves 240 MHz bandwidth, frequency switching time of less than 2 /spl mu/s, phase noise of -117 dBc/Hz at 100 kHz offset, and consumption current of 685 mA.
Keywords
UHF circuits; UHF mixers; direct digital synthesis; 2 GHz; 2 mus; 240 MHz; 685 mA; DDS driven synthesizer; direct frequency synthesizer; phase decrement type; quadrature mixer; Amplitude modulation; Band pass filters; Bandwidth; Circuits; Clocks; Frequency synthesizers; Land mobile radio; Phase noise; Read only memory; Wideband;
fLanguage
English
Publisher
ieee
Conference_Titel
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location
Phoenix, AZ, USA
ISSN
0149-645X
Print_ISBN
0-7803-6538-0
Type
conf
DOI
10.1109/MWSYM.2001.966992
Filename
966992
Link To Document