WO1998028852B1 - 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

Info

Publication number
WO1998028852B1
WO1998028852B1 PCT/SE1997/002121 SE9702121W WO9828852B1 WO 1998028852 B1 WO1998028852 B1 WO 1998028852B1 SE 9702121 W SE9702121 W SE 9702121W WO 9828852 B1 WO9828852 B1 WO 9828852B1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
output
transmitter
signal
locked loop
Prior art date
Application number
PCT/SE1997/002121
Other languages
French (fr)
Other versions
WO1998028852A2 (en
WO1998028852A3 (en
Filing date
Publication date
Priority claimed from US08/771,632 external-priority patent/US5834985A/en
Application filed filed Critical
Priority to BR9714050-3A priority Critical patent/BR9714050A/en
Priority to EP97951363A priority patent/EP0944960B1/en
Priority to CA002275589A priority patent/CA2275589A1/en
Priority to AU55022/98A priority patent/AU724122B2/en
Priority to DE69712092T priority patent/DE69712092T2/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

Links

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.

Claims

AMENDED CLAIMS[received by the International Bureau on 10 December 1998 (10.12.98); original claims 1-16 replaced by new claims 1-16 (3 pages)]
1. A transmitter for use in a communication system, comprising: a digital synthesizer; a phase locked loop, an output of said digital synthesizer coupled to an input S of said phase locked loop; and a phase modulation generator, an output of said phase modulation generator coupled to an input of said digital synthesizer such that said phase modulation generator phase modulates a signal at said output of said digital synthesizer.
2. The transmitter of Claim 1, further comprising a power control and amplifier stage, an output of said phase locked loop coupled to an input of said power control and amplifier stage.
3. The transmitter of Claim 1 , wherein said digitial synthesizer comprises a direct digital synthesizer.
4. The transmitter of Claim 1. wherein said phase locked loop comprises an upconversion stage for said transmitter.
5. The transmitter of Claim 1 , wherein said phase modulation generator comprises a phase modulation generator means for generating a plurality of phase trajectory signals at said output, said plurality of phase trajectory signals associated with information to be transmitted by said transmitter.
6. The transmitter of Claim 5, wherein a division ratio for said phase locked loop is N. and a scaling factor for said plurality of phase trajectory signals is .
7. The transmitter of Claim 1, further comprising a mixing means for mixing said signal at said output of said digital synthesizer wiih a local oscillator signal. -18-
8. The transmitter of Claim 1 , further comprising a first filter means for bandpass filtering said signal at said output of said digital synthesizer.
9. The transmitter of Claim 1, further comprising a second filter means 5 or bandpass filtering a signal at said input of said phase locked loop.
10. The transmitter of Claim 1 , wherein said phase modulation generator comprises a continuous phase modulation generator.
0 11. A method for modulating an output signal from a phase locked loop in a radio transmitter, comprising the steps of: generating a plurality of phase signals associated with information to be transmitted by said radio transmitter; modulating a signal at an output of a digital synthesizer with said plurality S of phase signals; and coupling said modulated signal at said output of said digital synthesizer to an input of said phase locked loop, and thereby modulating said output signal from said phase locked loop.
0 12. The method of Claim 11, wherein said plurality of phase signals comprises a continuous phase modulation signal.
13. The method of Claim 1 , wherein said plurality of phase signals comprises a plurality of phase trajectories. 5
14. The method of Claim 11 , further comprisng the step of bandpass filtering said signal at said output of said digital synthesizer.
15. The method of Claim 1 , further comprising the step of bandpass 0 filtering a signal at said input of said phase locked loop. -19-
16. The method of Claim 11 , further comprising the step of mixing said signal at said output of said digital synthesizer with a local oscillator signal.
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
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
DE69712092T DE69712092T2 (en) 1996-12-20 1997-12-16 DIGITAL CONTINUOUS PHASE MODULATION FOR A PHASE CONTROL LOOP CONTROLLED BY A DIRECT DIGITAL SYNTHETIZER

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 WO1998028852A3 (en) 1998-11-26
WO1998028852B1 true WO1998028852B1 (en) 1999-01-21

Family

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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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