Paper Info
Title
Novel Phase-Continuous Frequency Hopping Control For A Direct Frequency Synthesizer Using A Quadrature Mixer Driven By Two Ddss
Abstract
This paper presents novel phase-continuous frequency hopping (FH) control for a direct frequency synthesizer (DFS) using a quadrature mixer driven by two direct digital synthesizers (DDSS). To achieve wideband FH in both of the lower and the upper sidebands of a local frequency in a quadrature mixer, the proposed DFS decreases or increases the phase of DDS output signals corresponding to frequency offset from a local frequency of the quadrature mixer. To realize phase decrement, the proposed method adds a complement number in a phase accumulator of a DDS, while a conventional DDS does not use phase decrement but uses a switchable combiner. In addition, as the phase accumulator output changes continuously by summing phase increment, the proposed method always assures phase continuity of a DFS output signal, which ends up suppressing sidelobe level of frequency hopped signals. The calculation and measurement results indicate that a sidelobe of a signal spectrum using the proposed phase continuous method is approximately 10 dB better than that using a conventional phase discontinuous method.
Year
DOI
Venue
2006
10.1093/ietele/e89-c.12.1829
IEICE TRANSACTIONS ON ELECTRONICS
Keywords
Field
DocType
frequency synthesizer, direct digital synthesizer, quadrature mixer, phase accumulator, overflow, phase
Sideband,Harmonic mixer,Frequency offset,Continuous phase modulation,Automatic frequency control,Electronic engineering,Frequency synthesizer,Engineering,Direct digital synthesizer,Frequency mixer
Journal
Volume
Issue
ISSN
E89C
12
1745-1353
Citations 
PageRank 
References 
0
0.34
0
Authors
4
Name
Order
Citations
PageRank
Kenichi Tajima101.01
Ryoji Hayashi232.54
Kenji Itoh310430.50
yoji isota4106.12