Title:
DIGITAL TRANSMITTER
Document Type and Number:
WIPO Patent Application WO/2017/057164
Kind Code:
A1
Abstract:
A digital RF signal generation unit of this digital transmitter digitally modulates an I-signal and a Q-signal, thereby converting the I-signal into a first digital RF signal having a bit rate twice as high as a carrier frequency, and the Q-signal into a second digital RF signal having a bit rate twice as high as the carrier frequency. On the basis of a clock signal having a frequency 4n (n is an integer) times as high as the carrier frequency, a retiming unit outputs the first digital RF signal with a delay and outputs the second digital RF signal after having delayed the phase thereof by 90 degrees with respect to the output of the first digital RF signal. A first amplifier amplifies the first digital RF signal output by the retiming unit. A second amplifier amplifies the second digital RF signal output by the retiming unit. A synthesizer generates a single signal sequence by combining the amplified first digital RF signal with the amplified second digital RF signal.
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Inventors:
TANIO MASAAKI (JP)
HORI SHINICHI (JP)
YAMASE TOMOYUKI (JP)
HORI SHINICHI (JP)
YAMASE TOMOYUKI (JP)
Application Number:
PCT/JP2016/077937
Publication Date:
April 06, 2017
Filing Date:
September 23, 2016
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04L27/00; H03F3/217; H03F3/68; H03M7/32
Domestic Patent References:
| WO2015114702A1 | 2015-08-06 |
Foreign References:
| JP2011086983A | 2011-04-28 | |||
| JP2011077741A | 2011-04-14 |
Other References:
A.FRAPPE ET AL.: "Design techniques for very high speed digital delta-sigma modulators aimed at all-digital RF transmitters", ELECTRONICS, CIRCUITS AND SYSTEMS, 2006. ICECS'06. 13TH IEEE INTERNATIONAL CONFERENCE, July 2006 (2006-07-01), pages 1113 - 1116, XP031111689
ANTOINE FRAPPE ET AL.: "An All-Digital RF Signal Generator Using High- Speed DELTA SIGMA Modulators", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 44, no. 10, October 2009 (2009-10-01), pages 2722 - 2732, XP011276925
ANTOINE FRAPPE ET AL.: "An All-Digital RF Signal Generator Using High- Speed DELTA SIGMA Modulators", IEEE JOURNAL OF SOLID-STATE CIRCUITS, vol. 44, no. 10, October 2009 (2009-10-01), pages 2722 - 2732, XP011276925
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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