JPH01106632A - Tuner circuit for satellite broadcast television receiver - Google Patents
Tuner circuit for satellite broadcast television receiverInfo
- Publication number
- JPH01106632A JPH01106632A JP26464387A JP26464387A JPH01106632A JP H01106632 A JPH01106632 A JP H01106632A JP 26464387 A JP26464387 A JP 26464387A JP 26464387 A JP26464387 A JP 26464387A JP H01106632 A JPH01106632 A JP H01106632A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- television receiver
- agc
- mixer
- 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.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 abstract description 11
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は衛星放送テレビ受信機のチューナ回路に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a tuner circuit for a satellite television receiver.
「従来の技術」
一般に、衛星放送テレビ受信機は、通常の地上放送テレ
ビ受信機の前段にアダプタとしてのチューナ回路が結合
される。"Prior Art" Generally, a satellite broadcast television receiver has a tuner circuit as an adapter connected to the front stage of a normal terrestrial broadcast television receiver.
このチューナ回路について説明すると、パラボラアンテ
ナで１１Ｇ＆帯と４ＧＩｋ帯の衛星放送信号を受信する
と、コンバータで、９５０〜１４５０ＭＨｚ帯の第１の
中間周波（ＩＦ）信号に変換し、この第１のＩＦ倍信号
増幅回路で増幅、され、プリセレクタ回路で所定の周波
数の信号を選択してミクサ回路に送り。To explain this tuner circuit, when a parabolic antenna receives a satellite broadcasting signal in the 11G&band and 4GIk band, the converter converts it into a first intermediate frequency (IF) signal in the 950-1450MHz band, and multiplies this first IF signal. The signal is amplified by the signal amplification circuit, and the preselector circuit selects a signal with a predetermined frequency and sends it to the mixer circuit.
このミクサ回路では発振回路の局部発振信号と混合し、
１３４．２６Ｍ七の第２の中間周波（ＩＦ）信号を得。This mixer circuit mixes with the local oscillation signal of the oscillation circuit,
Obtain a second intermediate frequency (IF) signal of 134.26M7.
これを増幅回路で増幅した後、ローパスフィルタ（ＬＰ
Ｆ）回路を経てさらに増幅回路で増幅し１通常のテレビ
受信機の復調回路へと送られる。After amplifying this with an amplifier circuit, a low-pass filter (LP
F) circuit, is further amplified by an amplifier circuit, and is sent to the demodulation circuit of a normal television receiver.
「発明が解決しようとする問題点」
しかるに、地上のテレビ信号は周波数が衛星放送に比し
低いため、ＡＧＣ（自動利得制御）は信号の入力側でか
けられ、しかも、ＡＧＣをかける増幅回路はトランジス
タを主体としたものでも充分な減衰量が得られる。とこ
ろが、衛星放送では周波数が高いため、入力側ではＡＧ
Ｃがかけられず、しかも増幅回路がトランジスタを主体
とすると。``Problem to be solved by the invention'' However, since the frequency of terrestrial television signals is lower than that of satellite broadcasting, AGC (automatic gain control) is applied on the signal input side, and the amplifier circuit that applies AGC is a transistor. A sufficient amount of attenuation can be obtained even if the main component is However, because the frequency of satellite broadcasting is high, the AG
If C is not applied and the amplifier circuit is mainly composed of transistors.
第３図の点線特性（Ｂ）のように充分な減衰量が得られ
ないという問題があった。There was a problem in that a sufficient amount of attenuation could not be obtained as shown in the dotted line characteristic (B) in FIG.
本発明は充分な減衰量の得られる回路を提供しようとす
るものである。The present invention aims to provide a circuit that can obtain a sufficient amount of attenuation.
「問題点を解決するための手段」
本発明は上述のような目的を達成するためになされたも
ので、パラボラアンテナで受信した衛星放送信号をコン
バータで第１のＩＦ倍信号変換した後、プリセレクタ回
路で所定の周波数の信号を選択し、ミクサ回路で第２の
ＩＦ倍信号変換し、通常のテレビ受信機へ伝送するよう
にした回路において、前記ミクサ回路の後段に、前記第
２のＩＦ倍信号増幅する第２１Ｆ用増幅回路を設け、こ
の第２ＩＦ用増幅回路を構成するＭＯ５Ｏ５形Ｔのゲー
トにＡＧＣ回路を結合してなるものである。"Means for Solving the Problems" The present invention has been made to achieve the above-mentioned object, and after converting the satellite broadcasting signal received by the parabolic antenna into the first IF signal using the converter, In a circuit in which a selector circuit selects a signal of a predetermined frequency, a mixer circuit converts the signal into a second IF signal, and transmits the signal to a normal television receiver, the second IF is provided at a stage subsequent to the mixer circuit. A 21st F amplifier circuit for amplifying the signal by double is provided, and an AGC circuit is coupled to the gate of an MO5O5 type T constituting the second IF amplifier circuit.
「作用」
パラボラアンテナで１１ＧＨｚ帯と４ＧＨｚ帯の衛星放
送信号を受信すると、コンバータで９５０〜１４５０Ｍ
Ｈｚの第１のＩＦ倍信号変換され、さらにミクサ回路で
１３４．２６ＭＨｚの第２のＩＦ倍信号得、この信号は
第２ＩＦ用増幅回路で増幅される。この第２ＩＦ用増幅
回路はそのため、次段のプリセレクタでの伝送ロスに対
処する。プリセレクタを経てつぎのミクサ回路で第２の
ＩＦ倍信号変換されて通常のテレビ受信機の復調回路へ
信号が送られる。"Operation" When receiving satellite broadcasting signals in the 11GHz band and 4GHz band with a parabolic antenna, the converter receives 950~1450M
A first IF multiplied signal of Hz is converted, and a second IF multiplied signal of 134.26 MHz is obtained by a mixer circuit, and this signal is amplified by a second IF amplifier circuit. This second IF amplifier circuit therefore copes with transmission loss at the next stage preselector. After passing through the preselector, the signal is converted to a second IF signal by the next mixer circuit, and then sent to the demodulation circuit of a normal television receiver.
「実施例」 以下、本発明の一実施例を図面に基づき説明する。"Example" Hereinafter, one embodiment of the present invention will be described based on the drawings.
（１）はパラボラアンテナで、このパラボラアンテナ（
１）はコンバータ（２）を介してチューナ回路（３）の
入力端子（４）に結合されている。この入力端子（４）
は第１ＩＦ用増幅回路（５）、プリセレクタ回路（６）
を介してミクサ回路（７）に結合され、また、このミク
サ回路（７）には発振回路（８）と発振信号増幅回路（
９）が結合されている。このミクサ回路（７）の出力側
には、第２ＩＦ用の初段増幅回路（１１） 、ローパス
フィルタ（ＬＰＦ）回路（１２）、第２ＩＦ用の２段増
幅回路（１３）を介して出力端子（１４）が結合されて
いる。また、前記第２ＩＦ用の初段増幅回路（ｌ■）に
は自動利得制御（ＡＧＣ）回路（１０）が結合されてい
る。前記発振信号増幅回路（９）の出力側には第２ＩＦ
信号（１３４，２６ＭＨ２）のずれ検出用十分周回路（
１５）が結合されている。(1) is a parabolic antenna, and this parabolic antenna (
1) is coupled via a converter (2) to an input terminal (4) of a tuner circuit (3). This input terminal (4)
are the first IF amplifier circuit (5) and the preselector circuit (6)
The mixer circuit (7) is also connected to an oscillation circuit (8) and an oscillation signal amplification circuit (
9) are combined. The output side of this mixer circuit (7) is connected to an output terminal ( 14) are combined. Further, an automatic gain control (AGC) circuit (10) is coupled to the first stage amplifier circuit (1) for the second IF. A second IF is provided on the output side of the oscillation signal amplification circuit (9).
Sufficient circuit for detecting deviation of signal (134, 26MH2) (
15) are combined.
前記第２ＩＦ用の初段増幅回路（１１）は第２図に示す
ように、ＭＯＳ形Ｆ Ｅ Ｔ （１６）の他に、抵抗（
１７） （１８） （１９） （２０） （２１） （
２２） （２３） （２４）、コンデンサ（２５） （
２６） （２７） （２８）、コイル（２９） （３０
） （３１）からなり、第１ゲート側に、前記ミクサ回
路（７）が結合され。As shown in FIG. 2, the first stage amplifier circuit (11) for the second IF includes, in addition to a MOS type FET (16), a resistor (
17) (18) (19) (20) (21) (
22) (23) (24), capacitor (25) (
26) (27) (28), coil (29) (30
) (31), and the mixer circuit (7) is coupled to the first gate side.
第２ゲート側に前記ＡＧＣ回路（１０）が結合され、ソ
ースと第１ゲート側に電源（十Ｂ）が結合され、ドレン
側に前記ＬＰＦ回路（１２）が結合されている。The AGC circuit (10) is coupled to the second gate side, a power supply (10B) is coupled to the source and first gate sides, and the LPF circuit (12) is coupled to the drain side.
つぎに本発明の詳細な説明する。Next, the present invention will be explained in detail.
パラボラアンテナ（１）で１１ＧＨｚ帯と４ＧＨｚ帯の
衛星放送信号を受信すると、コンバータ（２）で、９５
０〜１４５０ＭＨｚ帯の第１の中間周波（ＩＦ）信号に
変換してチューナ回路（３）の入力端子（４）に入力す
る。この入力端子（４）に入力した第１のＩＦ倍信号第
１ＩＦ用の増幅回路（５）で増幅され、プリセレクタ回
路（６）で所定周波数を選択してミクサ回路（７）に送
られる。このミクサ回路（７）では発振回路（８）と発
振信号増幅回路（９）を介して送られてきた局部発振信
号と混合し、 １３４．２６ＭＨｚの第２の中間周波（
ＩＦ）信号が出力する。この第２のＩＦ倍信号第１ＩＦ
用の初段増幅回路（１１）で増幅されるが、このときＡ
ＧＣ回路（１０）からのＡＧＣ電圧で所定の利得に制御
される。すなわち、第３図の実線特性（Ａ）のように、
ＡＧＣ電圧の変化で減衰量が制御される。When the parabolic antenna (1) receives satellite broadcast signals in the 11 GHz band and 4 GHz band, the converter (2) converts the 95
It is converted into a first intermediate frequency (IF) signal in the 0 to 1450 MHz band and input to the input terminal (4) of the tuner circuit (3). The first IF multiplied signal input to this input terminal (4) is amplified by the first IF amplifier circuit (5), a preselector circuit (6) selects a predetermined frequency, and the signal is sent to the mixer circuit (7). This mixer circuit (7) mixes the local oscillation signal sent via the oscillation circuit (8) and the oscillation signal amplification circuit (9), and generates a second intermediate frequency of 134.26MHz (
IF) signal is output. This second IF multiplied signal first IF
It is amplified by the first stage amplifier circuit (11) for A.
It is controlled to a predetermined gain by the AGC voltage from the GC circuit (10). That is, like the solid line characteristic (A) in Fig. 3,
The amount of attenuation is controlled by changing the AGC voltage.
その後、ローパスフィルタ（ＬＰＦ）回路（１２）を経
て第２ＩＦ用の２段増幅回路（１３）で増幅され、この
１３４．２６Ｍ七の第２のＩＦ倍信号、出力端子（１４
）を経て通常のテレビ受信機の復調回路へと送られる。After that, it passes through a low-pass filter (LPF) circuit (12) and is amplified by a two-stage amplifier circuit (13) for the second IF, and this 134.26M7 second IF multiplied signal is output from the output terminal (14).
) and then sent to the demodulation circuit of a normal television receiver.
「発明の効果」
本発明は上述のようにＡＧＣをミクサ回路の後の第２Ｉ
Ｆ信号にかけるようにし、かつ、増幅回路をＭＯＳ形Ｆ
ＥＴを主体として構成したので、充分なゲインリダクシ
ョンを得ることができる。"Effects of the Invention" As described above, the present invention provides an AGC in the second I after the mixer circuit.
F signal, and the amplifier circuit is a MOS type F signal.
Since the configuration is based on ET, sufficient gain reduction can be obtained.
第１図は本発明によるチューナ回路中の第２ＩＦ用増幅
回路の一実施例を示す電気回路図、第２図は一般的な衛
星放送テレビ受信機のチューナ回路のブロック図、第３
図はゲインリダクション特性図である。
（１）・・・パラボラアンテナ、（２）・・・コンバー
タ、（３）・・・チューナ回路、（４）・・・入力端子
、（５）・・・増幅回路。
（６）・・・プリセレクタ、（７）・・・ミクサ回路、
（８）・・・発振回路、（９）・・・発振信号増幅回路
、（１０）・・・ＡＧＣ回路、（１１）・・・第２ＩＦ
用初段増幅回路、 （１２）・・・ＬＰＦ回路、 （１
３）・・・第２ＩＦ用２段増幅回路、 （１４）・・・
出力端子、 （１６）・・・ＭＯ５第５形Ｔ。
出願人 株式会社富士通ゼネラル
ｊ煮ニー」FIG. 1 is an electric circuit diagram showing an embodiment of the second IF amplifier circuit in the tuner circuit according to the present invention, FIG. 2 is a block diagram of the tuner circuit of a general satellite broadcast television receiver, and FIG.
The figure is a gain reduction characteristic diagram. (1) Parabolic antenna, (2) Converter, (3) Tuner circuit, (4) Input terminal, (5) Amplifier circuit. (6)...Preselector, (7)...Mixer circuit,
(8)...Oscillation circuit, (9)...Oscillation signal amplification circuit, (10)...AGC circuit, (11)...Second IF
first stage amplifier circuit, (12)...LPF circuit, (1
3)...Two-stage amplifier circuit for second IF, (14)...
Output terminal, (16)...MO5 fifth type T. Applicant: Fujitsu General Co., Ltd.
Claims (1)
バータで第１のＩＦ信号に変換した後、プリセレクタ回
路で所定の周波数の信号を選択し、ミクサ回路で第２の
ＩＦ信号に変換し、通常のテレビ受信機へ伝送するよう
にした回路において、前記ミクサ回路の後段に、前記第
２のＩＦ信号を増幅する第２ＩＦ用増幅回路を設け、こ
の第２ＩＦ用増幅回路を構成するＭＯＳ形ＦＥＴのゲー
トにＡＧＣ回路を結合してなることを特徴とする衛星放
送テレビ受信機のチューナ回路。(1) After converting the satellite broadcasting signal received by the parabolic antenna to the first IF signal using the converter, the preselector circuit selects a signal of a predetermined frequency, and the mixer circuit converts it to the second IF signal. In the circuit configured to transmit data to a television receiver, a second IF amplifier circuit for amplifying the second IF signal is provided after the mixer circuit, and a MOS type FET constituting the second IF amplifier circuit is provided. A tuner circuit for a satellite broadcasting television receiver, characterized in that an AGC circuit is coupled to a gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26464387A JPH01106632A (en) | 1987-10-20 | 1987-10-20 | Tuner circuit for satellite broadcast television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26464387A JPH01106632A (en) | 1987-10-20 | 1987-10-20 | Tuner circuit for satellite broadcast television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01106632A true JPH01106632A (en) | 1989-04-24 |
Family
ID=17406203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26464387A Pending JPH01106632A (en) | 1987-10-20 | 1987-10-20 | Tuner circuit for satellite broadcast television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01106632A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0429277U (en) * | 1990-06-30 | 1992-03-09 | ||
| KR20020012851A (en) * | 2000-08-09 | 2002-02-20 | 밍 루 | Sleep device of universal joint |
-
1987
- 1987-10-20 JP JP26464387A patent/JPH01106632A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0429277U (en) * | 1990-06-30 | 1992-03-09 | ||
| KR20020012851A (en) * | 2000-08-09 | 2002-02-20 | 밍 루 | Sleep device of universal joint |
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