WO1998028852A3 - Continuous phase modulator, comprising a direct digital synthesizer followed by a phase locked loop - Google Patents

Continuous phase modulator, comprising a direct digital synthesizer followed by a phase locked loop Download PDF

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Publication number
WO1998028852A3
WO1998028852A3 PCT/SE1997/002121 SE9702121W WO9828852A3 WO 1998028852 A3 WO1998028852 A3 WO 1998028852A3 SE 9702121 W SE9702121 W SE 9702121W WO 9828852 A3 WO9828852 A3 WO 9828852A3
Authority
WO
WIPO (PCT)
Prior art keywords
dds
pll
output
phase
frequency band
Prior art date
Application number
PCT/SE1997/002121
Other languages
French (fr)
Other versions
WO1998028852B1 (en
WO1998028852A2 (en
Inventor
Bo Sundegaard
Original Assignee
Ericsson Telefon Ab L M
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to BR9714050-3A priority Critical patent/BR9714050A/en
Priority to EP97951363A priority patent/EP0944960B1/en
Priority to DE69712092T priority patent/DE69712092T2/en
Priority to CA002275589A priority patent/CA2275589A1/en
Priority to AU55022/98A priority patent/AU724122B2/en
Publication of WO1998028852A2 publication Critical patent/WO1998028852A2/en
Publication of WO1998028852A3 publication Critical patent/WO1998028852A3/en
Publication of WO1998028852B1 publication Critical patent/WO1998028852B1/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2021—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained
    • H04L27/2025—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained in which the phase changes in a piecewise linear manner within each symbol period

Abstract

A system (10) and method are provided in which a phase modulation generator (12) is used to modulate the output signal of a DDS (18) with a modulation index, h/N. The phase-modulated DDS output drives a PLL (26), which is an upconversion stage for a radio transmitter, with the modulated DDS signal as the PLL's (26) reference. The output of the PLL (26) will have a modulation index of h. Consequently, the frequency band of the DDS (18) output is significantly narrower than the frequency band of upconversion stages used in conventional transmitters, and there are significantly less spurious emissions in the transmitted signal. However, a transmitter employing the present phase-modulated DDS-driven PLL topology can still transmit over a relatively wide frequency band.
PCT/SE1997/002121 1996-12-20 1997-12-16 Continuous phase modulator, comprising a direct digital synthesizer followed by a phase locked loop WO1998028852A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BR9714050-3A BR9714050A (en) 1996-12-20 1997-12-16 Transmitter for use in a communication system, and, process for modulating an output signal from a circuit locked in phase in a radio transmitter.
EP97951363A EP0944960B1 (en) 1996-12-20 1997-12-16 Digital continuous phase modulation for a dds-driven phase locked loop
DE69712092T DE69712092T2 (en) 1996-12-20 1997-12-16 DIGITAL CONTINUOUS PHASE MODULATION FOR A PHASE CONTROL LOOP CONTROLLED BY A DIRECT DIGITAL SYNTHETIZER
CA002275589A CA2275589A1 (en) 1996-12-20 1997-12-16 Digital continuous phase modulation for a dds-driven phase locked loop
AU55022/98A AU724122B2 (en) 1996-12-20 1997-12-16 Digital continuous phase modulation for a DDS-driven phase locked loop

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/771,632 US5834985A (en) 1996-12-20 1996-12-20 Digital continuous phase modulation for a DDS-driven phase locked loop
US08/771,632 1996-12-20

Publications (3)

Publication Number Publication Date
WO1998028852A2 WO1998028852A2 (en) 1998-07-02
WO1998028852A3 true WO1998028852A3 (en) 1998-11-26
WO1998028852B1 WO1998028852B1 (en) 1999-01-21

Family

ID=25092470

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/002121 WO1998028852A2 (en) 1996-12-20 1997-12-16 Continuous phase modulator, comprising a direct digital synthesizer followed by a phase locked loop

Country Status (9)

Country Link
US (1) US5834985A (en)
EP (1) EP0944960B1 (en)
KR (1) KR20000069646A (en)
CN (1) CN1245596A (en)
AU (1) AU724122B2 (en)
BR (1) BR9714050A (en)
CA (1) CA2275589A1 (en)
DE (1) DE69712092T2 (en)
WO (1) WO1998028852A2 (en)

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US7693230B2 (en) 1999-04-16 2010-04-06 Parkervision, Inc. Apparatus and method of differential IQ frequency up-conversion
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Also Published As

Publication number Publication date
EP0944960B1 (en) 2002-04-17
US5834985A (en) 1998-11-10
AU5502298A (en) 1998-07-17
EP0944960A2 (en) 1999-09-29
KR20000069646A (en) 2000-11-25
DE69712092T2 (en) 2002-10-10
BR9714050A (en) 2000-05-09
AU724122B2 (en) 2000-09-14
DE69712092D1 (en) 2002-05-23
CN1245596A (en) 2000-02-23
CA2275589A1 (en) 1998-07-02
WO1998028852A2 (en) 1998-07-02

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