EP2052537A1 - Booster circuit - Google Patents
Booster circuitInfo
- Publication number
- EP2052537A1 EP2052537A1 EP07808287A EP07808287A EP2052537A1 EP 2052537 A1 EP2052537 A1 EP 2052537A1 EP 07808287 A EP07808287 A EP 07808287A EP 07808287 A EP07808287 A EP 07808287A EP 2052537 A1 EP2052537 A1 EP 2052537A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- rejection filter
- frequency band
- booster circuit
- mobile communication
- 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.)
- Withdrawn
Links
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000010295 mobile communication Methods 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000002238 attenuated effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/191—Tuned amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H5/00—One-port networks comprising only passive electrical elements as network components
- H03H5/02—One-port networks comprising only passive electrical elements as network components without voltage- or current-dependent elements
-
- 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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
-
- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/114—Indexing scheme relating to amplifiers the amplifier comprising means for electro-magnetic interference [EMI] protection
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/165—A filter circuit coupled to the input of an amplifier
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/216—A coil being added in the input circuit, e.g. base, gate, of an amplifier stage
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/225—Indexing scheme relating to amplifiers the input circuit of an amplifying stage comprising an LC-network
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/237—A parallel resonance being added in series in the input circuit, e.g. base, gate, of an amplifier stage
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/391—Indexing scheme relating to amplifiers the output circuit of an amplifying stage comprising an LC-network
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/75—Indexing scheme relating to amplifiers the amplifier stage being a common source configuration MOSFET
Definitions
- the embodiment relates to a booster circuit.
- a mobile communication terminal has employed a function of receiving ground wave broadcasting, and an orthogonal frequency division multiplexing (OFDM) scheme, which is a European scheme, has been employed as one of ground wave broadcasting schemes.
- OFDM orthogonal frequency division multiplexing
- This phenomenon may occur when the intensity of a GSM signal input through an antenna and a citizen band filter is greater than the intensity of an oscillating frequency of an oscillator of the ground wave tuner.
- the oscillation of the ground wave tuner may be affected by the input GSM signal, so that an OSC killing phenomenon, in which the oscillator is not oscillated, occurs.
- the intensity of a GSM signal (OdBm to +1OdBm) is much greater than the intensity of a broadcasting channel signal (-8OdBm to -25dBm). If a signal having a strong intensity like the GSM signal is input to a booster, the signal is coupled with the broadcasting signal in the booster to make another interference signal.
- the booster amplifies the strong GSM signal, so that a stronger GSM signal causes an OSC killing phenomenon of killing an oscillator of a tuner, and a mutual interference exerts a fatal influence on a reception performance.
- the embodiment provides a booster circuit capable of reducing frequency in- terference by weakening the intensity of an unnecessary signal input to an OFDM tuner. [9] The embodiment provides a booster circuit capable of preventing an OSC killing phenomenon of a tuner by excluding an unnecessary broadcasting channel signal when a broadcasting channel signal is received.
- a booster circuit comprises a rejection filter for filtering a signal, which has a frequency band higher than a preset frequency band, among input signals, and a booster for receiving and amplifying a signal output from the rejection filter.
- a mobile communication terminal comprises a booster circuit, which comprises a rejection filter filtering a signal, which has a frequency band higher than a frequency band of a broadcasting channel signal, among input signals, and a booster amplifying a signal output from the rejection filter, and a tuner which receives a signal output from the booster circuit.
- OFDM tuner is weakened, thereby preventing frequency interference.
- an unnecessary broadcasting signal is excluded when a broadcasting channel signal is received, thereby preventing an OSC killing phenomenon of a tuner.
- FIG. 1 is a block diagram showing a booster circuit according to the embodiment
- FIG. 2 is a circuit diagram showing a booster circuit according to the embodiment.
- FIG. 3 is a graph showing the characteristic of a booster circuit according to the embodiment.
- FIG. 1 is a block diagram showing a booster circuit according to the embodiment.
- the booster circuit comprises a citizen band filter 11, a rejection filter 12, and a booster 13.
- the citizen band filter 11 removes a citizen band signal from an input signal.
- the input signal may be a broadcasting channel signal input through an antenna.
- the rejection filter 12 attenuates a signal, which is out of a desired frequency band, in signals having passed through the citizen band filter 11.
- the rejection filter 12 may be realized to attenuate a signal, which has a frequency band excluding a frequency band for a broadcasting signal, in broadcasting channel signals in which a citizen band signal is removed.
- the attenuated signal may have a frequency band greater than the frequency band of the broadcasting channel signal.
- the booster 13 amplifies a signal input thereto from the rejection filter 12.
- the booster 13 may receive a broadcasting channel signal output from the rejection filter 12 to amplify the broadcasting channel signal.
- a signal having an unnecessary frequency band is attenuated in the rejection filter 12, thereby inputting only a signal having a desired frequency band to the booster 13. Accordingly, a received broadcasting channel signal may be prevented from being affected by an external signal.
- Such a booster circuit may be variously realized. For instance, a circuit shown in
- FIG. 2 can be used as the booster circuit.
- FIG. 2 is a circuit diagram showing the booster circuit according to the embodiment
- FIG. 3 is a graph showing a characteristic of the booster circuit according to the embodiment.
- the booster circuit comprises a citizen band filter 21, a rejection filter 22, and a booster 23.
- the citizen band filter 21 comprises a capacitor C3 and an inductor L2.
- the citizen band filter 21 removes a signal having a citizen band in the range of 26MHz to 30MHz, which is not used, from broadcasting channel signals input from an antenna ANT.
- the rejection filter 22 comprises an inductor L3 and a capacitor C4.
- the rejection filter 22 may be realized to attenuate a signal except for the broadcasting channel signal input from the citizen band filter 21.
- the rejection filter 22 may be realized to attenuate a signal having a frequency band exceeding 900MHz, which is greater than a frequency band of the broadcasting channel signal.
- the frequency band of the attenuated signal may be set by adjusting the capacity of the inductor L3 and the capacitor C4.
- the rejection filter 22 can attenuate a GSM signal (948MHz) having the intensity within the range of OdBm to +1OdBm and employing a frequency band exceeding 900MHz as a central frequency.
- FIG. 2 shows a case in which the rejection filter 22 comprises the inductor L3 and the capacitor C4.
- the rejection filter 22 may be variously constructed if necessary.
- the rejection filter 22 may comprise a single step filter as shown in FIG. 2 or a multi-step filter.
- the rejection filter 22 may have a structure in which a plurality of filters including an inductor and a capacitor are serially connected to each other.
- the booster 23 comprises a transistor Ql and passive elements.
- the booster 23 amplifies and outputs the broadcasting channel signal input from the rejection filter 22 such that the broadcasting channel signal can be tuned in a superior reception state.
- the broadcasting channel signal is input through an antenna ANT, and then input to the citizen band filter 21 through a loop through 20.
- the citizen band filter 21 removes a signal having a frequency band in the range of 26MHz to 30MHz.
- the broadcasting channel signal is input to the booster 23 through the rejection filter 22.
- the booster 23 amplifies the input broadcasting channel signal and outputs the amplified broadcasting channel signal to the tuner.
- the rejection filer 22 attenuates a signal input through the antenna if the signal has a frequency band outside a broadcasting channel band. For example, if a GSM signal (948MHz), which has the intensity in the range of OdBm to +1OdBm, and employs a frequency band exceeding 900MHz as a central frequency, is received, the intensity of the GSM signal is attenuated to down as much as 3OdB to 4OdB through the rejection filter 22. As described above, the rejection filter 22 previously filters a signal having a great intensity except for a broadcasting channel signal. Accordingly, a signal excluding a broadcasting channel signal is not input to the booster 23, thereby preventing the broadcasting channel signal from being affected by an external signal.
- the above booster circuit is adaptable for a mobile communication terminal.
- the mobile communication terminal comprises a tuner (e.g., a ground wave tuner) for selecting a broadcasting channel signal.
- a tuner e.g., a ground wave tuner
- the ground wave tuner may be realized through an OFDM scheme
- the mobile communication terminal may be realized through a GSM scheme.
- example embodiment means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention.
- the appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
- the intensity of an undesired signal input in an OFDM tuner is weakened, thereby preventing frequency interference from occurring.
- an undesired signal is excluded when a broadcast channel signal is received, thereby preventing an OSC killing phenomenon of a tuner.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020060092262A KR20080026968A (en) | 2006-09-22 | 2006-09-22 | Input circuit of ground wave tuner |
PCT/KR2007/004497 WO2008035893A1 (en) | 2006-09-22 | 2007-09-18 | Booster circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2052537A1 true EP2052537A1 (en) | 2009-04-29 |
EP2052537A4 EP2052537A4 (en) | 2011-03-16 |
Family
ID=39200689
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07808287A Withdrawn EP2052537A4 (en) | 2006-09-22 | 2007-09-18 | Booster circuit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2052537A4 (en) |
KR (1) | KR20080026968A (en) |
WO (1) | WO2008035893A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6351294B1 (en) * | 1997-06-17 | 2002-02-26 | Alps Electric Co., Ltd. | Television signal receiving tuner capable of receiving FM broadcasting signals without being affected by other interference signals |
WO2002073794A2 (en) * | 2001-03-09 | 2002-09-19 | California Institute Of Technology | Switchless multi-resonant, multi-band power amplifier |
EP1418680A1 (en) * | 2001-08-10 | 2004-05-12 | Hitachi Metals, Ltd. | Bypass filter; multi;band antenna switch circuit; and layered module composite part and communication device using them |
JP2005080109A (en) * | 2003-09-02 | 2005-03-24 | Murata Mfg Co Ltd | High frequency switching circuit |
JP2005323063A (en) * | 2004-05-07 | 2005-11-17 | Hitachi Metals Ltd | Branching filter circuit |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR0160687B1 (en) * | 1994-04-29 | 1999-01-15 | 김광호 | Image signal receiving apparatus equipped with low noise amplifier |
JP3358724B2 (en) * | 1999-08-20 | 2002-12-24 | シャープ株式会社 | Electronic tuner |
KR100550875B1 (en) * | 2004-02-27 | 2006-02-10 | 삼성전기주식회사 | Rf modulator with narrow band pass filter |
-
2006
- 2006-09-22 KR KR1020060092262A patent/KR20080026968A/en not_active Application Discontinuation
-
2007
- 2007-09-18 EP EP07808287A patent/EP2052537A4/en not_active Withdrawn
- 2007-09-18 WO PCT/KR2007/004497 patent/WO2008035893A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6351294B1 (en) * | 1997-06-17 | 2002-02-26 | Alps Electric Co., Ltd. | Television signal receiving tuner capable of receiving FM broadcasting signals without being affected by other interference signals |
WO2002073794A2 (en) * | 2001-03-09 | 2002-09-19 | California Institute Of Technology | Switchless multi-resonant, multi-band power amplifier |
EP1418680A1 (en) * | 2001-08-10 | 2004-05-12 | Hitachi Metals, Ltd. | Bypass filter; multi;band antenna switch circuit; and layered module composite part and communication device using them |
JP2005080109A (en) * | 2003-09-02 | 2005-03-24 | Murata Mfg Co Ltd | High frequency switching circuit |
JP2005323063A (en) * | 2004-05-07 | 2005-11-17 | Hitachi Metals Ltd | Branching filter circuit |
Non-Patent Citations (1)
Title |
---|
See also references of WO2008035893A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008035893A1 (en) | 2008-03-27 |
EP2052537A4 (en) | 2011-03-16 |
KR20080026968A (en) | 2008-03-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20080329 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: LG INNOTEK CO., LTD. |
|
RBV | Designated contracting states (corrected) |
Designated state(s): ES FR GB |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: 8566 |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20110211 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: H03F 3/19 20060101ALI20110207BHEP Ipc: H03H 7/01 20060101ALI20110207BHEP Ipc: H04N 5/50 20060101AFI20080414BHEP |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20110913 |