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WO2003001688A2 - Dispositif de communications - Google Patents

Dispositif de communications Download PDF

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Publication number
WO2003001688A2
WO2003001688A2 PCT/EP2002/006334 EP0206334W WO03001688A2 WO 2003001688 A2 WO2003001688 A2 WO 2003001688A2 EP 0206334 W EP0206334 W EP 0206334W WO 03001688 A2 WO03001688 A2 WO 03001688A2
Authority
WO
WIPO (PCT)
Prior art keywords
filter
power amplifier
amplifier circuitry
transconductance
radio transmitter
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2002/006334
Other languages
English (en)
Other versions
WO2003001688A3 (fr
Inventor
Ulrika Sallenhag
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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
Priority claimed from GB0115088A external-priority patent/GB2376823B/en
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to US10/480,987 priority Critical patent/US20040157574A1/en
Priority to AU2002317789A priority patent/AU2002317789A1/en
Publication of WO2003001688A2 publication Critical patent/WO2003001688A2/fr
Publication of WO2003001688A3 publication Critical patent/WO2003001688A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/52—Transmission power control [TPC] using AGC [Automatic Gain Control] circuits or amplifiers

Definitions

  • This invention relates to a communications device, and in particular to a radio communication device, such as a mobile phone.
  • the invention relates to the adjustment of a filter within the transmit circuitry of the radio communication device, for use in different radio communication systems.
  • the different operating standards place different requirements on the power amplifier and the filter circuitry in the transmit circuitry of the radio communication device.
  • EP-A-0682458 discloses a radio communication device, which is capable of operating in GSM and PCN modes.
  • a power amplifier within a main unit of the device is set to produce output signals at power levels required by GSM, and a filter in the main unit is set so that it has a bandwidth required for GSM operation.
  • the device also includes an additional unit which contains an additional power amplifier.
  • the additional power amplifier is switched into the transmit signal path instead of the power amplifier within the main unit.
  • the additional power amplifier is set to produce output signals at power levels required for PCN operation. Further, the filter in the main unit is adjusted so that it has a bandwidth required for PCN operation.
  • a power level of a signal for transmission is detected, and the bandwidth of the filter is adjusted in response thereto.
  • a control signal which is used to control a mode of operation of an amplifier is detected, and the bandwidth of the filter is adjusted in response thereto.
  • the filter is a transconductance filter.
  • the bandwidth of the filter is advantageously adjusted by controlling a transconductance value within the filter.
  • Figure 1 is a block schematic diagram of a circuit in accordance with the invention.
  • Figure 2 is a block schematic diagram of a second circuit in accordance with the invention.
  • FIG. 3 is a block schematic diagram of a third circuit in accordance with the invention.
  • FIG. 1 is a block schematic diagram of the relevant components of a radio frequency transmitter.
  • the invention is described herein with reference to its use in a mobile phone, but it will be appreciated that the invention is generally applicable to portable radio communication equipment or mobile radio terminals, such as mobile telephones, pagers, communicators, electronic organisers, smartphones, personal digital assistants (PDAs), or the like.
  • portable radio communication equipment or mobile radio terminals such as mobile telephones, pagers, communicators, electronic organisers, smartphones, personal digital assistants (PDAs), or the like.
  • PDAs personal digital assistants
  • An input signal which could for example be an analog signal or a digital code signal after analog- digital conversion, is provided on an input line 10. This signal is applied to an amplifier 12, which could for example be an exponential amplifier.
  • the output from the amplifier 12 is a step function, which needs to be smoothed in order to provide an output with an acceptable switch spectrum, that is, in order to remove the transient spurious signals that are caused by the switching of the power amplifier.
  • the smoothing function is provided by means of a filter 14, which in this presently preferred embodiment of the invention is a second-order transconductance filter.
  • the filtered output is supplied to a further amplifier 16, which acts as a buffer, and provides signals at the correct input level for a power amplifier 18, which provides the amplified signal for trans ission over the air interface.
  • the amplifiers 12, 16 and an integrated part 19 of the filter 14 are provided on an integrated circuit 20.
  • the properties of the filter 14, such as the cut off frequency and the slope of the frequency characteristic, are determined by the effective value of resistance in the integrated part 19 of the filter 14, and by the values of capacitors 22, 24, which are provided off the integrated circuit 20.
  • the effective value of resistance in the integrated part 19 of the filter 14 is determined by the inverse (l/gm) of a transconductance value (gm) .
  • the illustrated power amplifier block 18 preferably contains separate amplifier circuitry for each mode in which the device can operate.
  • a triple-band mobile phone which is operable under the GSM (i.e. GSM at 900MHz) , DCS (i.e. GSM at 1800MHz) and PCS (i.e. GSM at 1900MHz) standards preferably contains at least partially separate amplifier circuitry for use in those three modes.
  • the mobile phone will typically be required to transmit signals at a power level which depends on the distance of the mobile phone from its serving base station. The power level will typically be determined by the network, and a corresponding signal sent to the mobile phone.
  • GSM Global System for Mobile Communications
  • the input signal which is provided on the input line 10, will vary in magnitude.
  • a connection is made between the input line 10 and the integrated part 19 of the filter 14. Based on the detected power level of the input signal, the value gm of the transconductance in the filter 14 is adjusted, so that the bandwidth, or cut-off frequency, of the filter takes a value which is appropriate for that power level .
  • the bandwidth, or cut-off frequency, of the filter affects the speed at which the power amplifier 18 can ramp up its output power to reach the required level.
  • a higher cut-off frequency that is, a wider bandwidth
  • the filter properties must therefore be chosen so that the ramping of the power amplifier can be as required.
  • the filter characteristic must therefore be chosen to allow the filter to meet the demands on the switching spectrum and the time ramping properties of the power amplifier.
  • Figure 2 is a block schematic diagram of the relevant components of an alternative radio frequency transmitter.
  • An input signal which could for example be an analog signal or a digital code signal after analog- digital conversion, is provided on an input line 30.
  • This signal is applied to an amplifier 32, which could for example be an exponential amplifier.
  • the output from the amplifier 32 is a step function, which needs to be smoothed in order to provide an output with an acceptable switch spectrum.
  • the smoothing function is provided by means of a filter 34, which in this presently preferred embodiment of the invention is a second-order transconductance filter.
  • the filtered output is supplied to a further amplifier 36, which acts as a buffer, and provides signals at the correct input level for a power amplifier 38, which provides the amplified signal for transmission over the air interface.
  • the amplifiers 32, 36 and an integrated part 39 of the filter 34 are provided on an integrated circuit 40.
  • the properties of the filter 34 are determined by the effective value of resistance in the integrated part 39 of the filter 34, and by the values of capacitors 42, 44, which are provided off the integrated circuit 40.
  • the effective value of resistance in the integrated part 39 of the filter 34 is determined by the inverse (l/gm) of a transconductance value (gm) .
  • the illustrated power amplifier block 38 preferably contains separate amplifier circuitry for each mode in which the device can operate. For example, a triple-band mobile phone which is operable under the GSM, DCS and PCS standards preferably contains at least partially separate amplifier circuitry for use in those three modes .
  • the mobile phone will typically be required to transmit signals at a power level which depends on the distance of the mobile phone from its serving base station.
  • the power level will typically be determined by the network, and a corresponding signal sent to the mobile phone.
  • GSM Global System for Mobile Communications
  • the input signal which is provided on the input line 10
  • the input signal will vary in magnitude.
  • a connection is made between the input line 30 and a control block 46.
  • the control block also receives an input signal PA_mode, which indicates whether the phone is operating in GSM, DCS or PCS mode, and is the signal which is also used to control the power amplifier block 38, as described above, so that the appropriate power amplifier circuitry is used.
  • PA_mode which indicates whether the phone is operating in GSM, DCS or PCS mode
  • control block 46 determines an appropriate value for the transconductance in the integrated section 39 of the filter 34, and it sends a control signal to the filter so that the value gm of the transconductance in the filter takes the desired value.
  • the bandwidth, or cut-off frequency, of the filter 34 then takes a value which is appropriate for that mode and power level .
  • Figure 3 is a block schematic diagram of the relevant components of a further alternative radio frequency transmitter.
  • An input signal which could for example be an analog signal or a digital code signal after analog- digital conversion, is provided on an input line 50.
  • This signal is applied to an amplifier 52, which could for example be an exponential amplifier.
  • the output from the amplifier 52 is a step function, which needs to be smoothed in order to provide an output with an acceptable switch spectrum.
  • the smoothing function is provided by means of a filter 54, which in this presently preferred embodiment of the invention is a second-order transconductance filter.
  • the filtered output is supplied to a further amplifier 56, which acts as a buffer, and provides signals at the correct input level for a power amplifier 58, which provides the amplified signal for transmission over the air interface.
  • the amplifiers 52, 56 and an integrated part 59 of the filter 54 are provided on an integrated circuit 60.
  • the properties of the filter 54 such as the cut off frequency and the slope of the frequency characteristic, are determined by the effective value of resistance in the integrated part 59 of the filter 54, and by the values of capacitors 62, 64, which are provided off the integrated circuit 60.
  • the effective value of resistance in the integrated part 59 of the filter 54 is determined by the inverse (l/gm) of a transconductance value (gm) .
  • the illustrated power amplifier block 58 preferably contains separate amplifier circuitry for each mode in which the device can operate. For example, a triple-band mobile phone which is operable under the GSM, DCS and PCS standards preferably contains at least partially separate amplifier circuitry for use in those three modes .
  • an input signal PA_mode which indicates whether the phone is operating in GSM, DCS or PCS mode, and is used to control the power amplifier block 58 so that the appropriate power amplifier circuitry is used, is also supplied to the integrated part 59 of the filter 58.
  • the transconductance device or devices in the integrated section 59 of the filter 54 are controlled so that the value gm of the transconductance in the filter takes the desired value.
  • the bandwidth, or cut-off frequency, of the filter 54 then takes a value which is appropriate for that mode and power level .

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

Selon l'invention, dans un émetteur radioélectrique, tel qu'un dispositif de communications mobile, un filtre est réglé, en fonction d'un niveau de puissance d'un signal de transmission détecté, et/ou en fonction d'un mode de fonctionnement du dispositif. La bande passante est réglée, par contrôle d'un élément de transconductance présent dans le filtre. Ledit filtre peut ensuite être contrôlé pour présenter des caractéristiques qui sont appropriées pour les conditions de fonctionnement du dispositif dans lequel le filtre est utilisé, et qui permettent d'obtenir un spectre de commutation acceptable pour les signaux, tout en permettant à la puissance de sortie de l'amplificateur de puissance d'accélérer rapidement de manière acceptable. Par exemple, ledit filtre peut être réglé en fonction des normes de communications (par exemple, GSM ou PCS) sous lesquelles le dispositif fonctionne et en fonction du niveau de puissance des signaux transmis.
PCT/EP2002/006334 2001-06-20 2002-06-10 Dispositif de communications Ceased WO2003001688A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/480,987 US20040157574A1 (en) 2001-06-20 2002-06-10 Communications device
AU2002317789A AU2002317789A1 (en) 2001-06-20 2002-06-10 Communications device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0115088A GB2376823B (en) 2001-06-20 2001-06-20 Communications device
GB0115088.7 2001-06-20
US30124401P 2001-06-26 2001-06-26
US60/301,244 2001-06-26

Publications (2)

Publication Number Publication Date
WO2003001688A2 true WO2003001688A2 (fr) 2003-01-03
WO2003001688A3 WO2003001688A3 (fr) 2003-03-20

Family

ID=26246213

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/006334 Ceased WO2003001688A2 (fr) 2001-06-20 2002-06-10 Dispositif de communications

Country Status (2)

Country Link
AU (1) AU2002317789A1 (fr)
WO (1) WO2003001688A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2108221A4 (fr) * 2007-01-31 2014-07-09 Samsung Electronics Co Ltd Procede de balayage d'arriere-plan pour dispositifs clients de reseau local sans fil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2140092A (en) * 1991-05-13 1992-12-30 Omnipoint Corporation Dual mode transmitter and receiver
JP2586333B2 (ja) * 1994-05-13 1997-02-26 日本電気株式会社 無線通信装置
US6154664A (en) * 1998-06-24 2000-11-28 Conexant System, Inc. Dual band cellular phone with two power amplifiers and power control circuit therefore
EP1043833A1 (fr) * 1999-04-07 2000-10-11 Lucent Technologies Inc. Boucle de réglage de puissance pour fréquences radio avec filtre de boucle variable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2108221A4 (fr) * 2007-01-31 2014-07-09 Samsung Electronics Co Ltd Procede de balayage d'arriere-plan pour dispositifs clients de reseau local sans fil
US9125140B2 (en) 2007-01-31 2015-09-01 Samsung Electronics Co., Ltd Background scanning method for WLAN client devices

Also Published As

Publication number Publication date
WO2003001688A3 (fr) 2003-03-20
AU2002317789A1 (en) 2003-01-08

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