JP2007500989A - 自動利得制御を有するチャネルセレクタ - Google Patents
自動利得制御を有するチャネルセレクタ Download PDFInfo
- Publication number
- JP2007500989A JP2007500989A JP2006530891A JP2006530891A JP2007500989A JP 2007500989 A JP2007500989 A JP 2007500989A JP 2006530891 A JP2006530891 A JP 2006530891A JP 2006530891 A JP2006530891 A JP 2006530891A JP 2007500989 A JP2007500989 A JP 2007500989A
- Authority
- JP
- Japan
- Prior art keywords
- attenuator
- signal
- switching
- preamplifier
- channel
- 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- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
-
- 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
- H04N5/52—Automatic gain control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
Abstract
【解決手段】自動利得制御(AGC)電圧は、所定の「テイク・オーバー・ポイント(TOP)」の後でRF前置増幅器の利得を低減させるためにIF出力信号から得られる(遅延AGC)。混合器のIF出力経路には切替え減衰器が設けられ、これは、自動利得制御電圧の制御下でオン及びオフに切替えられる。減衰器はTOPを超えたレベルでオンである。
Description
Claims (3)
- 受信したRFチャネル信号を増幅する利得制御されたRF前置増幅器と、
該増幅されたRFチャネル信号をIFチャネル信号に変換するための混合段と、
該混合段の出力に接続され、該IFチャネル信号から望ましいチャネル信号を選択するIFフィルタと、
該IFフィルタの出力に接続され、該選択されたIFチャネル信号のレベルが所定のレベルを上回るときに、高レベルモードで該RF前置増幅器の利得を低減し、該選択されたIFチャネル信号のレベルが該所定のレベルを下回るときに、低レベルモードで該RF前置増幅器の利得を十分に一定に保つAGC電圧を該選択されたIFチャネル信号から得る手段とを縦列に有するチャネルセレクタにおいて、
該混合段の出力と該IFフィルタの入力との間に切替え減衰器を有し、該切替え減衰器は、該高レベルモードの少なくとも一部で作動し、該低レベルモードの少なくとも一部で作動しないように、該AGC電圧によって制御されることを特徴とするチャネルセレクタ。 - 前記切替え減衰器に並列接続された切替え増幅器を有し、該切替え増幅器は、前記切替え減衰器が作動しない前記低レベルモードの一部で作動するように、前記AGC電圧によって制御されることを特徴とする、請求項1記載のチャネルセレクタ。
- 前記切替え減衰器及び前記切替え増幅器は、前記AGC電圧と所定のDC電圧とを比較する比較器によって夫々切替えられることを特徴とする、請求項2記載のチャネルセレクタ。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IB0303970 | 2003-05-27 | ||
PCT/IB2004/050758 WO2004107574A1 (en) | 2003-05-27 | 2004-05-24 | Channel selector with automatic gain control |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2007500989A true JP2007500989A (ja) | 2007-01-18 |
Family
ID=33485268
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006530891A Withdrawn JP2007500989A (ja) | 2003-05-27 | 2004-05-24 | 自動利得制御を有するチャネルセレクタ |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1632027A1 (ja) |
JP (1) | JP2007500989A (ja) |
KR (1) | KR20060013554A (ja) |
CN (1) | CN100546184C (ja) |
WO (1) | WO2004107574A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4676365B2 (ja) * | 2006-03-20 | 2011-04-27 | 新日本無線株式会社 | 利得切換増幅器 |
KR102211171B1 (ko) * | 2020-04-17 | 2021-02-01 | 삼성에스디아이 주식회사 | 이차전지 및 그 케이스 제조방법 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4172239A (en) * | 1978-10-06 | 1979-10-23 | Rca Corporation | Signal attenuator |
JP3371506B2 (ja) * | 1994-02-14 | 2003-01-27 | 株式会社日立製作所 | 受信装置 |
US5940143A (en) * | 1995-10-06 | 1999-08-17 | Hitachi, Ltd. | High-definition television signal receiving apparatus and gain control circuit thereof |
JP2996170B2 (ja) * | 1996-03-21 | 1999-12-27 | 日本電気株式会社 | 利得制御回路 |
JP3627783B2 (ja) * | 1996-12-26 | 2005-03-09 | シャープ株式会社 | ケーブルモデム用チューナ |
CN1190964C (zh) * | 2000-02-14 | 2005-02-23 | 夏普公司 | 电缆调制解调器的调谐器 |
WO2004098052A1 (en) * | 2003-04-29 | 2004-11-11 | Koninklijke Philips Electronics N. V. | Receiver circuit with adjustable if amplifier gain |
-
2004
- 2004-05-24 CN CNB2004800147532A patent/CN100546184C/zh not_active Expired - Fee Related
- 2004-05-24 WO PCT/IB2004/050758 patent/WO2004107574A1/en not_active Application Discontinuation
- 2004-05-24 KR KR1020057022395A patent/KR20060013554A/ko not_active Application Discontinuation
- 2004-05-24 EP EP04734584A patent/EP1632027A1/en not_active Withdrawn
- 2004-05-24 JP JP2006530891A patent/JP2007500989A/ja not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CN1795612A (zh) | 2006-06-28 |
KR20060013554A (ko) | 2006-02-10 |
EP1632027A1 (en) | 2006-03-08 |
CN100546184C (zh) | 2009-09-30 |
WO2004107574A1 (en) | 2004-12-09 |
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