WO2003001688A3 - Communications device - Google Patents

Communications device Download PDF

Info

Publication number
WO2003001688A3
WO2003001688A3 PCT/EP2002/006334 EP0206334W WO03001688A3 WO 2003001688 A3 WO2003001688 A3 WO 2003001688A3 EP 0206334 W EP0206334 W EP 0206334W WO 03001688 A3 WO03001688 A3 WO 03001688A3
Authority
WO
WIPO (PCT)
Prior art keywords
filter
adjusted
power level
depending
communications device
Prior art date
Application number
PCT/EP2002/006334
Other languages
French (fr)
Other versions
WO2003001688A2 (en
Inventor
Ulrika Sallenhag
Original Assignee
Ericsson Telefon Ab L M
Ulrika Sallenhag
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 Ericsson Telefon Ab L M, Ulrika Sallenhag filed Critical Ericsson Telefon Ab L M
Priority to US10/480,987 priority Critical patent/US20040157574A1/en
Priority to AU2002317789A priority patent/AU2002317789A1/en
Publication of WO2003001688A2 publication Critical patent/WO2003001688A2/en
Publication of WO2003001688A3 publication Critical patent/WO2003001688A3/en

Links

Classifications

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

Landscapes

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

Abstract

In a radio transmitter, such as a mobile communications device, a filter is adjusted, based on a power level of a signal for transmission is detected, and/or on a mode of operation of the device. The bandwidth of the filter is adjusted, by controlling a transconductance element in the filter. The filter can therefore be controlled to have characteristics which are suitable for the operating conditions of the device in which the filter is being used, and which give an acceptable switching spectrum for the signals, while also allowing the output power of the power amplifier to ramp up acceptably quickly. For example, the filter can be adjusted depending on the communications standard (e.g. GSM or PCS) under which the device is operating, and depending on the power level of transmitted signals.
PCT/EP2002/006334 2001-06-20 2002-06-10 Communications device WO2003001688A2 (en)

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
GB0115088.7 2001-06-20
GB0115088A GB2376823B (en) 2001-06-20 2001-06-20 Communications device
US30124401P 2001-06-26 2001-06-26
US60/301,244 2001-06-26

Publications (2)

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

Family

ID=26246213

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/006334 WO2003001688A2 (en) 2001-06-20 2002-06-10 Communications device

Country Status (2)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE531657C2 (en) 2007-01-31 2009-06-23 Nanoradio Ab Background scan method for WLAN client devices

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5291516A (en) * 1991-05-13 1994-03-01 Omnipoint Data Company, Inc. Dual mode transmitter and receiver
EP0682458A2 (en) * 1994-05-13 1995-11-15 Nec Corporation Radio communication device
EP1043833A1 (en) * 1999-04-07 2000-10-11 Lucent Technologies Inc. RF power control loop with variable loop filter
US6154664A (en) * 1998-06-24 2000-11-28 Conexant System, Inc. Dual band cellular phone with two power amplifiers and power control circuit therefore

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5291516A (en) * 1991-05-13 1994-03-01 Omnipoint Data Company, Inc. Dual mode transmitter and receiver
EP0682458A2 (en) * 1994-05-13 1995-11-15 Nec Corporation Radio communication device
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 (en) * 1999-04-07 2000-10-11 Lucent Technologies Inc. RF power control loop with variable loop filter

Also Published As

Publication number Publication date
WO2003001688A2 (en) 2003-01-03
AU2002317789A1 (en) 2003-01-08

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