CN1255947C - 超高频通带中的开关 - Google Patents

超高频通带中的开关 Download PDF

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Publication number
CN1255947C
CN1255947C CNB028014413A CN02801441A CN1255947C CN 1255947 C CN1255947 C CN 1255947C CN B028014413 A CNB028014413 A CN B028014413A CN 02801441 A CN02801441 A CN 02801441A CN 1255947 C CN1255947 C CN 1255947C
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band
signal
circuit
diode
output
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CN1462506A (zh
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K·C·邝
Y·T·托
S·L·特奥
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02Automatic frequency control
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means

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  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Filters And Equalizers (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

在使用具有甚高频-H带通电路和超高频带通电路的组合输入的IC时,会出现由于调谐电路之一引起的并不希望出现的谐振。此问题通过提供一种开关装置可以得到解决,当甚高频-H频带信号由甚高频-H带通电路接收时,该开关装置用于使超高频带通电路与组合输入去耦合。该开关装置包括耦合在超高频带通电路和公用输入之间的开关。

Description

超高频通带中的开关
本发明涉及一种具有超高频通带电路和甚高频通带电路的调谐器。
US 6,225,865公开了一种在具有不同方向性的天线间切换的开关电路。不需要另外的衰减电路,该开关电路就可以在甚高频/超高频频带中为“off”信号提供隔离。它包括放大输入信号的放大器和把放大的信号耦合至公用输出端的开关装置。该开关电路还包括一个控制电路,该控制电路根据控制信号的第一状态以使开关装置处于导通状态同时使放大器放大输入信号。该控制电路还根据控制信号的第二状态以使开关装置处于不导通状态同时消除放大器的直流工作电压,以进一步把输入信号与输出隔离。
尤其是,本发明的一个目的是在第二带通电路向公用输入端提供输出信号时使第一带通电路与公用输入端去耦合。
本发明通过提供一种调谐器而解决了所述问题,该调谐器包括:第一带通电路,用于接收第一广播频带的第一信号并具有用于提供第一输出信号的第一输出端;第二带通电路,用于接收第二广播频带的第二信号并具有用于提供第二输出信号的第二输出端;混频器电路,具有既接收第一输出信号又接收第二输出信号的公用输入端;以及开关装置,当第二输出信号应当提供给公用输入端时,该开关装置用于把第一带通电路与至少一个公用输入端去耦合。
根据本发明的一个实施例,第一广播频带是超高频频带,而第二广播频带是甚高频-H频带。开关装置包括耦合于至少一个第一输出端与相应的公用输入端之一之间的开关。
根据本发明的另一个特征,该开关装置包括用于短路第一输出信号的开关,该开关是可由偏压控制的二极管。
参考附图可以更好地理解本发明,其中:
图1以示意图的形式表示超高频双调谐带通滤波器的实施例;
图2以示意图的形式表示具有两个开关二极管的超高频双调谐带通滤波器的实施例;
图3以示意图的形式表示具有两个开关二极管和反向偏压的超高频双调谐带通滤波器的实施例;并且
图4以示意图的形式表示具有一个开关二极管的超高频双调谐带通滤波器的实施例。
图1表示与具有第一和第二带通电路的公用输入的混频器电路连接的第一带通电路和第二带通电路。第一带通电路是典型的超高频带通滤波器1,用于接收超高频频带的信号并具有提供该信号的第一输出端。第二带通电路是甚高频-H带通滤波器4,用于接收甚高频频带的信号并具有用以提供该信号的第二输出端。两个输出端与混频器电路的组合输入端2,3连接。混频器电路是混频器和振荡器锁相环(MOPLL/MO)IC7。
超高频带通滤波器1接收的信号经耦合元件到达IC7。耦合元件是连接至IC7的输入端2的串联的线圈5和电容器6,以及与IC7的输入端3串联的线圈8和电容器9。当甚高频-H带通滤波器4接收信号时,在调谐至甚高频-H频带4时将会出现不希望的谐振。这些并不希望出现的谐振由超高频带通电路1的元件建立。
在图2中,诸如附加开关二极管10这样的开关装置串联在图1所示的超高频双调谐带通滤波器的线圈5和电容器6之间。第二附加开关二极管11串联在线圈8和电容器9之间。控制电流经电阻12馈送给开关二极管10的连接。第二控制电流经电阻13馈送给开关二极管11的连接。在二极管10和电容器6的连接点,分流电阻14接地。在二极管11与电容器9的连接点,分流电阻15也接地。二极管10和11优选Schottky(肖特基)阻挡层或PIN二极管。
超高频带通滤波器1接收的信号经线圈5、二极管10和电容器6到达IC7的输入端2,并经线圈8、二极管11和电容器9到达输入端3。二极管10,11通过在甚高频-H带通电路4接收信号时阻挡信号而起到开关的作用。这将防止超高频带通电路1引起的并不希望出现的谐振,并且信号到达IC7的输入端2,3。
图3表示具有反向偏压的附加开关二极管10,11。这些二极管通过使用ICDC偏压而反向。二极管10与IC7的输入端2直接连接,而不需要图2所示的分流电阻14和电容器6。二极管11与IC7的输入端3直接连接,并不需要图2所示的分流电阻15和电容器9。
超高频带通滤波器1接收的信号经线圈5和二极管10到达IC7的输入端2,并经线圈8和二极管11到达输入端3。二极管10,11通过在甚高频-H带通电路4接收信号时阻挡信号而起到开关的作用。这样做的优点在于防止并不希望出现的谐振,并且在二极管切换为OFF时,电容还将进一步降低。
在图4中,超高频带通滤波器1通过耦合元件,即图1所示的线圈5,8和电容器6,9连接至输入端2和3。甚高频-H带通滤波器4还与图1所示的IC7的组合输入端2,3连接。附加开关二极管16与超高频带通滤波器1和相应的线圈5,8的连接点连接。控制电流通过电阻12提供给二极管16,电阻12与超高频带通滤波器1与线圈5的连接点连接。
超高频带通滤波器1接收的信号经线圈5,8和电容器6,9到达IC7。当甚高频-H频带接收信号时,超高频通带滤波器1通过附加二极管16而短路。因而,接收的信号到达IC7的输入端2,3。

Claims (3)

1.一种调谐器,包括:
-第一带通电路,用于接收第一广播频带的第一信号并具有用于提供第一输出信号的第一输出端,
-第二带通电路,用于接收第二广播频带的第二信号并具有用于提供第二输出信号的第二输出端,
-混频器电路,具有既接收第一输出信号又接收第二输出信号的公用输入端,和
-开关装置,当第二输出信号应当提供给公用输入端时,该开关装置使第一带通电路与至少一个公用输入端去耦合,
其中该开关装置包括二极管,其直接连接到所述第一输出端用于短路第一输出信号,并且连接到耦合元件用于将第一广播频带的信号耦合到混频器电路。
2.如权利要求1所述的调谐器,其中第一广播频带是超高频频带,而第二广播频带是甚高频-H频带。
3.如权利要求1所述的调谐器,其中该开关可由偏压控制。
CNB028014413A 2001-04-27 2002-04-24 超高频通带中的开关 Expired - Fee Related CN1255947C (zh)

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US (1) US7209726B2 (zh)
EP (1) EP1386395A1 (zh)
JP (1) JP2004520758A (zh)
KR (1) KR20040000298A (zh)
CN (1) CN1255947C (zh)
WO (1) WO2002089327A1 (zh)

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US7672653B2 (en) * 2007-03-20 2010-03-02 Intel Corporation Removing interfering signals in a broadband radio frequency receiver

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WO2002089327A1 (en) 2002-11-07
EP1386395A1 (en) 2004-02-04
JP2004520758A (ja) 2004-07-08
KR20040000298A (ko) 2004-01-03
US7209726B2 (en) 2007-04-24
CN1462506A (zh) 2003-12-17
US20040108916A1 (en) 2004-06-10

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