JPS6053316A - Low pass filter circuit - Google Patents
Low pass filter circuitInfo
- Publication number
- JPS6053316A JPS6053316A JP16169483A JP16169483A JPS6053316A JP S6053316 A JPS6053316 A JP S6053316A JP 16169483 A JP16169483 A JP 16169483A JP 16169483 A JP16169483 A JP 16169483A JP S6053316 A JPS6053316 A JP S6053316A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- output
- signal
- pass filter
- amplifier
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier
Landscapes
- Networks Using Active Elements (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は低域濾波器に関し、特に１？八１チユーナに
好適な低域濾波器に閂するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-pass filter, particularly 1? This is a low-pass filter suitable for the 81 tuner.
従来、この種の製箔″と１−で第１図接水すものがあっ
た。Conventionally, this type of foil manufacturing has been in contact with water in Figure 1.
図において人力Ｄａｔｌｉ子１１−１抵抗Ｒ□の一端に
接続され、他端は抵抗Ｒ２の一端々コンデンサＣ□の一
端に接続される。刃先抗Ｒ２のイ１Ｂ端はコンデンサＣ
２の−１１：！ａと増幅器３の非反転入力に接続され、
増幅器３の反転入力と出力とＣ２の他端は接続される。In the figure, one end of the human power input terminal 11-1 is connected to one end of the resistor R□, and one end of the resistor R2 is connected to one end of the capacitor C□. The A1B end of the cutting edge resistance R2 is the capacitor C.
2-11:! a and the non-inverting input of amplifier 3,
The inverting input and output of amplifier 3 and the other end of C2 are connected.
また、増幅器３の出力は抵抗Ｒ５の一端とコンデンサＣ
１の一端に接続され、抵抗Ｒ３の他端はコンデンサＣ３
の一端と抵抗ｆ４の一端に接ｈｅ Ｇれる。コンデンサ
Ｃ５及びＣ６の他端は接地される。Also, the output of amplifier 3 is connected to one end of resistor R5 and capacitor C
1, and the other end of resistor R3 is connected to capacitor C3.
One end of the resistor f4 is connected to the other end of the resistor f4. The other ends of capacitors C5 and C6 are grounded.
コンデンサＣ８の他端は抵抗ＩＩ、の一端とコンデンサ
Ｃ４の一端に接続され、抵抗Ｒ３の他ｉｈｉに接地され
る。また抵抗Ｒ４の他端とコンデンサＣ４のイｔ！」端
は接続されで出力端子２となる。The other end of the capacitor C8 is connected to one end of the resistor II and one end of the capacitor C4, and is grounded to the resistor R3 as well as ihi. Also, the connection between the other end of resistor R4 and capacitor C4 is! ' end is connected and becomes output terminal 2.
次に動作＋ｃついて説明する。Next, operation +c will be explained.
通常、ＦＭチューナーにおけるステレオ復調器の出力に
はサブキャリア等の不−Ｕな信号が含寸れるので、この
不要な４Ｍ号を取り除くために・）！１図に示すような
フィルタが用いられる。Normally, the output of the stereo demodulator in an FM tuner contains un-U signals such as subcarriers, so in order to remove this unnecessary 4M signal...)! A filter as shown in Figure 1 is used.
抵抗Ｒ，，Ｒ２，コンデンサＣＩ＋ Ｃ２及び増幅器３
で、１２ ｄ Ｂ ／ ｏ ｃ ｔのＬＰ１１’（ロー
パスフィルタ）を構成しており、１５ＫＨｚより上の帯
域全敗り除いている。また、抵抗Ｒ３，Ｒ，、Ｉζ５コ
ンデンサＣｓ、Ｃ４，Ｃｓによってサブキャリアの３８
．ＫＨｚを取シ除くツインＴ型回路が構成はれており、
上記ＬＰＦと合わせて出力に表われる不要１８号を取り
除いている。Resistor R,, R2, capacitor CI+ C2 and amplifier 3
This constitutes a 12 dB/oct LP11' (low-pass filter), and eliminates all losses in the band above 15 KHz. In addition, 38 of the subcarrier is
．． It has a twin T-type circuit that removes KHz.
Together with the above LPF, unnecessary No. 18 that appears in the output is removed.
Ｄｉ来の低域濾波回路は以上のようにノλ−成されてい
ノこので、ＩＩＪ’ ＩＩｌ＃ 帯域の１１１カイｌ、
号（２（ｌ ｆｌ ｚ 〜１ｓ ｔ（１１ｙ、 ）はフ
ィルターを通過することになり、信号の劣化を生じるな
どの欠点があった。Since the low-pass filter circuit of Di is constructed as above, 111 km of the IIJ'IIl# band,
No. 2 (l fl z ~1s t (11y, )) passes through a filter, which has drawbacks such as signal deterioration.
本発明は上記のような従来のものの欠点を除去するため
に成さ第１たもので、可聴ｊＷ城の信号は入力から出力
にターイレクトにつ々がれ、１だ不要なザブキャリア領
域はキャンセル１！１路によってキャンセルするように
ｔｌ！成さ；ｉＬ、 ｐＪ聴帯域の信号は、フィルタを
：＋１０過ぜす、（Ｉ’ｊ号劣化がないようにした低域
（濾波器を提供することを目的としている。The present invention was first made to eliminate the drawbacks of the conventional ones as described above, and the audible JW signal is passed directly from the input to the output, and the unnecessary subcarrier area is canceled. 1! tl to cancel by 1 way! The signal in the hearing band is filtered by +10, which is intended to provide a low-frequency filter with no I'j deterioration.
以下この発明の一実施例を図に基づいて説明する。An embodiment of the present invention will be described below based on the drawings.
；ｒｒ、 ２図において、入力端子１は抵抗比の一端と
抵抗Ｒ７の一端と抵抗Ｒ，の一端にそれぞれ接続され、
抵抗Ｒｙの他端はインタフタＬの一端に接伏される。イ
ンタ゛クタＬの他端はコンデンサ６丁の一端に接続され
、抵抗Ｒ，の他端はコンデンサＣ８の一端に接続され６
゜コンデンサＣ８の他Ｑｊ＋□４はコンデン゛Ｃ７の他
端、ｊＧ１１！：ｇ回路３の反転入力、抵抗Ｉ（。の一
端にそ扛ぞれ接続ネれ、’Ｗ幅益３の非反転の入力は接
地される。増幅器３の出力は抵抗Ｒ９の他端及び抵抗Ｒ
８゜の一端に接続官ｔ１．る。;rr, In Figure 2, the input terminal 1 is connected to one end of the resistance ratio, one end of the resistor R7, and one end of the resistor R, respectively.
The other end of the resistor Ry is grounded to one end of the interfter L. The other end of inductor L is connected to one end of capacitor 6, and the other end of resistor R is connected to one end of capacitor C8.
゜In addition to capacitor C8, Qj+□4 is the other end of capacitor C7, jG11! :The inverting input of the circuit 3 is connected to one end of the resistor I(.), and the non-inverting input of the W gain 3 is grounded.The output of the amplifier 3 is connected to the other end of the resistor R9 and the resistor I. R
Connector t1 at one end of 8°. Ru.
Ｒ＋ｏの他産１：はＲｓの他端と接続嘔れ、出力ｙ＃子
２となる。R+o's other end 1: is connected to the other end of Rs, resulting in output y# child 2.
次にこの発明の作用について説明する。Next, the operation of this invention will be explained.
入力端子１からｊｊｊ１幅器３の出力をみプこときの特
性は、サブキャリア周波数である３ ８ Ｋ Ｊ（Ｚニ
ピークを持ったバイパス形のフィルタ／ｉ−！、性を示
している。この特性を第４図に示す３゜また、入力端子
ｌに加えられる信号と増（１’、’、’＝ Ｒ，’ｉ３
の出力は逆相となっており、出力端子２においてサブ領
域信号の位相ｆｄ：抵抗ＩＣ，を、＋Ｉ’Ｄるものと、
抵抗Ｒ８ｏを通るものとで逆相となり、ツブ・１菖＋３
頭域はキャンセルされ、結局入力端子対出力Ｏｊｊ子の
特性は−【：３図のようになる。The characteristic of looking at the output of the jjj1 width filter 3 from the input terminal 1 is that the subcarrier frequency is 3 8 K J (a bypass type filter with Z peaks/i-!). The characteristics are shown in Figure 4.3゜Also, the signal applied to the input terminal
The output of is in reverse phase, and the phase fd of the sub-area signal at the output terminal 2: resistance IC, is +I'D,
The phase is opposite to the one passing through the resistor R8o, and the tsubu 1 iris + 3
The head area is canceled, and the characteristics of the input terminal versus output Ojj child become as shown in -[:3 figure.
この結果、入力端子１に加えられた信号成分のうち、口
Ｊ聴帯域のイへ号はフィルターｔＭＵらず出力端子に表
われる。As a result, among the signal components applied to the input terminal 1, the A signal in the mouth J hearing band appears at the output terminal without the filter tMU.
壕だ、上記実施例ではキャンセル回ｔ′６は、抵抗Ｒｙ
、 Ｒａ 、コンデンサＣ？ｖ Ｃ１１＋ インタフ
タし、増幅器３を用いて構成されていたが、仁れを別の
構成のＨＰＦとよ・きかえても同様な動作となる。In the above embodiment, the cancellation time t'6 is the resistance Ry.
, Ra, capacitor C? v C11+ interface and was configured using amplifier 3, but the same operation will occur even if the input is replaced with an HPF of a different configuration.
ノン上のように、この発明によれば、川聴帯域のイ８郵
は入力から出力にタイレフトに接続され、呻／コ不９３
サブキャリア領域の信号はキャンセル回路によってキャ
ンセルするように構成したので、可聴づ１シ域（２０Ｈ
ｚ 〜１５Ｋ）（ｚ）の信号は、フィルターを全く通過
せず、出力信号としては信号の劣化がないものを得るこ
とができる。As shown above, according to this invention, the I8 post of the river listening band is connected to the tie left from the input to the output, and the moan/ko fu 93
Since the signal in the subcarrier area is configured to be canceled by a cancellation circuit, the signal in the audible range (20H
The signal of z ~ 15K) (z) does not pass through the filter at all, and an output signal without signal deterioration can be obtained.
第１図は従来の低域４１７波回路を示す図、第２図は本
発明の一実施例による低域波回路を示す図、第３ ｒ＝
＋は第２図の回路の周波数対利得特性を示す図、第４図
は第２図中のキャンセル回路の特性を示す図である。
１・・・・・・入力端子
２・・・・・・出力端子
３・・・・・・力１１幅器
４コｒ許出願人
パイオニア株式会社
第３図
−７１−FIG. 1 is a diagram showing a conventional low-frequency 417-wave circuit, FIG. 2 is a diagram showing a low-frequency circuit according to an embodiment of the present invention, and 3rd r=
+ is a diagram showing the frequency versus gain characteristics of the circuit in FIG. 2, and FIG. 4 is a diagram showing the characteristics of the cancellation circuit in FIG. 2. 1...Input terminal 2...Output terminal 3...Power 11 Width device 4 Cor Applicant: Pioneer Corporation Figure 3-71-
Claims (1)
端子と増幅器の反転入力間に互いに並列接続されたｚ；
３１及び第２の直列共振ＩＪ路と、増幅器の反転入力と
出力間に接続した抵抗と、増幅器の出力に結合しプこ出
力端子とをイ＋１ｉｆｆえたことを特徴とする低域濾波
回路。z connected in parallel with each other between the input terminal and the non-inverting input input of the amplifier, which is grounded, and the input terminal and the inverting input of the amplifier;
31, a second series resonant IJ path, a resistor connected between the inverting input and the output of the amplifier, and a puco output terminal coupled to the output of the amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16169483A JPS6053316A (en) | 1983-09-02 | 1983-09-02 | Low pass filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16169483A JPS6053316A (en) | 1983-09-02 | 1983-09-02 | Low pass filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6053316A true JPS6053316A (en) | 1985-03-27 |
Family
ID=15740082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16169483A Pending JPS6053316A (en) | 1983-09-02 | 1983-09-02 | Low pass filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6053316A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5478053A (en) * | 1977-12-02 | 1979-06-21 | Matsushita Electric Ind Co Ltd | Filter circuit |
| JPS576725A (en) * | 1980-05-12 | 1982-01-13 | American Cyanamid Co | Manufacture of film for barrier of acrylonitrile polymer biaxial-oriented |
-
1983
- 1983-09-02 JP JP16169483A patent/JPS6053316A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5478053A (en) * | 1977-12-02 | 1979-06-21 | Matsushita Electric Ind Co Ltd | Filter circuit |
| JPS576725A (en) * | 1980-05-12 | 1982-01-13 | American Cyanamid Co | Manufacture of film for barrier of acrylonitrile polymer biaxial-oriented |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6143884B2 (en) | ||
| JPH04245807A (en) | Filter device | |
| JPS6053316A (en) | Low pass filter circuit | |
| JPS5560320A (en) | Active filter | |
| US4423394A (en) | Multiple pole bandpass filter having monolithic crystal elements | |
| JPS6362133B2 (en) | ||
| JPS5834813Y2 (en) | Multi-frequency “ro” wave device | |
| JPS6010155Y2 (en) | speaker network | |
| JPS5834812Y2 (en) | Noise removal circuit | |
| JPS5931052Y2 (en) | band pass filter | |
| JPS6117369B2 (en) | ||
| JPS631457Y2 (en) | ||
| JPH0635543Y2 (en) | Equalizer circuit | |
| JPS6017997Y2 (en) | stereo microphone | |
| JPS6024036Y2 (en) | trap device | |
| JP2959138B2 (en) | Bandpass filter circuit | |
| KR930006837Y1 (en) | Color signal filter circuit | |
| JPH0112437Y2 (en) | ||
| JPS60247314A (en) | Fdnr type low pass filter | |
| JPS5936005Y2 (en) | shared device | |
| JPS6143315Y2 (en) | ||
| JPS6083411A (en) | Emphasis and deemphasis system using band-pass filter | |
| JPS6324348B2 (en) | ||
| JPS59174011A (en) | Electric signal filter | |
| JPH0231507A (en) | Two-way information plug socket and two-way information distributor |