WO2002035712A3 - Radio transmitters - Google Patents

Radio transmitters Download PDF

Info

Publication number
WO2002035712A3
WO2002035712A3 PCT/GB2001/004705 GB0104705W WO0235712A3 WO 2002035712 A3 WO2002035712 A3 WO 2002035712A3 GB 0104705 W GB0104705 W GB 0104705W WO 0235712 A3 WO0235712 A3 WO 0235712A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
frequency
mixer
produce
output signal
Prior art date
Application number
PCT/GB2001/004705
Other languages
French (fr)
Other versions
WO2002035712A2 (en
Inventor
Dennis Culling
Geoffrey Sidney Sparks
Original Assignee
Sepura Ltd
Dennis Culling
Geoffrey Sidney Sparks
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 Sepura Ltd, Dennis Culling, Geoffrey Sidney Sparks filed Critical Sepura Ltd
Priority to EP01978599A priority Critical patent/EP1330881A2/en
Publication of WO2002035712A2 publication Critical patent/WO2002035712A2/en
Publication of WO2002035712A3 publication Critical patent/WO2002035712A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B21/00—Generation of oscillations by combining unmodulated signals of different frequencies
    • H03B21/01—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
    • H03L7/185—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number using a mixer in the loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators

Abstract

A signal synthesiser arrangement includes a signal generator in the form of a voltage controlled oscillator (VCO) (10) which generates a high frequency source signal under the control of a control unit (16). The synthesiser control unit (16) controls the oscillator (10) to produce an output signal of a given frequency. The output signal of frequency F1 from the oscillator (10) is provided to a signal mixer (12). It is also input to a frequency divider (15), which divides it by a value N1 to produce an 'offset frequency' signal F2 which is also provided to the mixer (12). The mixer (12) combines these signals and provides the combined signal to a bandpass filter (11) which filters the combined signal to select and provide one of the 'sideband' signals produced by the mixer, i.e. F1 + F2, or F1 - F2, as its output signal F3, while suppressing the unwanted, other sideband signal. The output signal F3 from the filter (11) is further frequency divided by a second value N2 in a further frequency divider (17) to produce a signal of frequency Fout that can be used as a carrier frequency signal for a radio transmitter.
PCT/GB2001/004705 2000-10-23 2001-10-23 Radio transmitters WO2002035712A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01978599A EP1330881A2 (en) 2000-10-23 2001-10-23 Radio transmitters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0025902.8 2000-10-23
GB0025902A GB0025902D0 (en) 2000-10-23 2000-10-23 Radio transmitters

Publications (2)

Publication Number Publication Date
WO2002035712A2 WO2002035712A2 (en) 2002-05-02
WO2002035712A3 true WO2002035712A3 (en) 2002-09-06

Family

ID=9901793

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/004705 WO2002035712A2 (en) 2000-10-23 2001-10-23 Radio transmitters

Country Status (3)

Country Link
EP (1) EP1330881A2 (en)
GB (2) GB0025902D0 (en)
WO (1) WO2002035712A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI633760B (en) * 2016-01-29 2018-08-21 立積電子股份有限公司 Signal transmitter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2100534A (en) * 1981-06-16 1982-12-22 Standard Telephones Cables Ltd Frequency synthesiser
JPH0964734A (en) * 1995-08-21 1997-03-07 Sony Corp Pll circuit and receiver
US6087865A (en) * 1994-12-22 2000-07-11 Anritsu Company Programmable frequency divider
WO2001001562A1 (en) * 1999-06-24 2001-01-04 Siemens Aktiengesellschaft Electronic circuit arrangement generating a transmit frequency

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2595783B2 (en) * 1990-07-31 1997-04-02 日本電気株式会社 Transmitter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2100534A (en) * 1981-06-16 1982-12-22 Standard Telephones Cables Ltd Frequency synthesiser
US6087865A (en) * 1994-12-22 2000-07-11 Anritsu Company Programmable frequency divider
JPH0964734A (en) * 1995-08-21 1997-03-07 Sony Corp Pll circuit and receiver
WO2001001562A1 (en) * 1999-06-24 2001-01-04 Siemens Aktiengesellschaft Electronic circuit arrangement generating a transmit frequency

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KARLQUIST R: "A narrow band high-resolution synthesizer using a direct digital synthesizer followed by repeated dividing and mixing", FREQUENCY CONTROL SYMPOSIUM, 1995. 49TH., PROCEEDINGS OF THE 1995 IEEE INTERNATIONAL SAN FRANCISCO, CA, USA 31 MAY-2 JUNE 1995, NEW YORK, NY, USA,IEEE, US, 31 May 1995 (1995-05-31), pages 217 - 235, XP010155176, ISBN: 0-7803-2500-1 *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 07 31 July 1997 (1997-07-31) *

Also Published As

Publication number Publication date
WO2002035712A2 (en) 2002-05-02
GB2372163A (en) 2002-08-14
GB0025902D0 (en) 2000-12-06
GB0125455D0 (en) 2001-12-12
EP1330881A2 (en) 2003-07-30

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