Title:
TRANSMISSION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2014/192574
Kind Code:
A1
Abstract:
This transmission circuit comprises: a comparator which converts a phase modulation signal from a quadrature modulator into a pulse signal to use the pulse signal as the sampling clock of a delta-sigma modulator; and an asynchronous clock transfer unit and an interpolation circuit which are provided between a circuit that operates on a baseband clock and the delta-sigma modulator. The asynchronous clock transfer unit converts an amplitude component signal synchronized with the baseband clock into an amplitude component signal synchronized with a divide-by-N clock obtained by dividing the sampling clock by N. The interpolation circuit interpolates an output signal from the asynchronous clock transfer unit such that the amount of change of one sample in the divide-by-N clock and the amount of change of one sample in the sampling clock become the same.
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Inventors:
DOI YOSHIAKI (JP)
Application Number:
PCT/JP2014/063200
Publication Date:
December 04, 2014
Filing Date:
May 19, 2014
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04L27/32; H03M3/02; H04L27/20; H04L27/36
Domestic Patent References:
| WO2011078120A1 | 2011-06-30 | |||
| WO2013035523A1 | 2013-03-14 | |||
| WO2011078120A1 | 2011-06-30 |
Foreign References:
| JP2011135200A | 2011-07-07 | |||
| JP3878029B2 | 2007-02-07 | |||
| JP2006148964A | 2006-06-08 | |||
| JP2007511187A | 2007-04-26 | |||
| JP2011135200A | 2011-07-07 | |||
| JP3878029B2 | 2007-02-07 | |||
| JP4394620B2 | 2010-01-06 |
Other References:
A. FRAPPE ET AL.: "A digital ?? RF signal generator for mobile communication transmitters in 90nm CMOS", IEEE RADIO FREQUENCY INTEGRATED CIRCUITS SYMPOSIUM (2008. RFIC, 2008, pages 13 - 16, XP031284274
E. M. UMALI ET AL.: "Power Spectral Analysis of the Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Amplification of OFDM Signals", IEEE VEHICULAR TECHNOLOGY CONFERENCE (2008. VTC SPRING, 2008, pages 1261 - 1265, XP031255730
E. UMALI; Y. TOYAMA; Y. YAMAO: "power Spectral Analysis of the Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Amplification of OFDM Signals", PRC. IEEE VTC SPRING, May 2008 (2008-05-01)
A. FRAPEE; B. STEFANELLI; A. FLAMENT; A. KAISER; A. CATHELIN: "A digital AE RF signal generator for mobile communication transmitters in 90nm CMOS", IEEE RF IC SYMP., June 2008 (2008-06-01)
See also references of EP 3007398A4
E. M. UMALI ET AL.: "Power Spectral Analysis of the Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Amplification of OFDM Signals", IEEE VEHICULAR TECHNOLOGY CONFERENCE (2008. VTC SPRING, 2008, pages 1261 - 1265, XP031255730
E. UMALI; Y. TOYAMA; Y. YAMAO: "power Spectral Analysis of the Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Amplification of OFDM Signals", PRC. IEEE VTC SPRING, May 2008 (2008-05-01)
A. FRAPEE; B. STEFANELLI; A. FLAMENT; A. KAISER; A. CATHELIN: "A digital AE RF signal generator for mobile communication transmitters in 90nm CMOS", IEEE RF IC SYMP., June 2008 (2008-06-01)
See also references of EP 3007398A4
Attorney, Agent or Firm:
MIYAZAKI, Teruo et al. (JP)
Akio Miyazaki (JP)
Akio Miyazaki (JP)
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