JPS61322U - filter circuit - Google Patents
filter circuitInfo
- Publication number
- JPS61322U JPS61322U JP8461584U JP8461584U JPS61322U JP S61322 U JPS61322 U JP S61322U JP 8461584 U JP8461584 U JP 8461584U JP 8461584 U JP8461584 U JP 8461584U JP S61322 U JPS61322 U JP S61322U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- filter circuit
- series connection
- connection circuit
- capacitor
- 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.)
- Granted
Links
Landscapes
- Filters And Equalizers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は帯域除去型フィルタの基本回路図、第２図は第
１図のフィルタの伝送周波数特性図、第３図は大切スイ
ッチ素子を付加した従来の第１例のフィルタ回路を示す
回路図、第４図は理想的なフィルタ切換特性を示す実測
周波数特性図、第５図はスイッチ素子としてトランジス
タを用いた場合の従来の第２例のフィルタ回路を示す回
路図、第６図は該従来の第２例におけるフィルタ・バイ
パス時の近似等価回路図、第７図は従来の第２例と本考
案の一実施例によるフィルタ・バイパス時の実測周波数
特性図、第８図は本考案の一実施例の回路図、第９図は
本考案の一実施例のフィルタ・バイパス時の近似等価回
路図、第１０図は本考案の一実施例の高周波領域での等
価回路と周波数特性を示す図、第１１図は本考案の他の
実施例を示す回路図である。
１，２は抵抗、３はインダクタ、４はコンデンサ、５は
スイッチ素子、６はフィルタ人切指令信号、７は周波数
特性補正用コンデンサである。
なお図中同一符号は同一又は相当部分を示す。Figure 1 is a basic circuit diagram of a band-rejection filter, Figure 2 is a transmission frequency characteristic diagram of the filter in Figure 1, and Figure 3 is a circuit diagram showing the first example of a conventional filter circuit with an added important switch element. , Fig. 4 is a measured frequency characteristic diagram showing ideal filter switching characteristics, Fig. 5 is a circuit diagram showing a second example of a conventional filter circuit using a transistor as a switching element, and Fig. 6 is a diagram showing the conventional filter circuit. Fig. 7 is an approximate equivalent circuit diagram when the filter is bypassed in the second example of the present invention. Fig. 7 is an actual measured frequency characteristic diagram when the filter is bypassed according to the second conventional example and an embodiment of the present invention. A circuit diagram of an embodiment, FIG. 9 is an approximate equivalent circuit diagram of an embodiment of the present invention at the time of filter bypass, and FIG. 10 is a diagram showing an equivalent circuit and frequency characteristics in a high frequency region of an embodiment of the present invention. , FIG. 11 is a circuit diagram showing another embodiment of the present invention. 1 and 2 are resistors, 3 is an inductor, 4 is a capacitor, 5 is a switch element, 6 is a filter cut-off command signal, and 7 is a frequency characteristic correction capacitor. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (2)
一端がこの抵抗の出力端に接続されたインダクタ、コン
デンサ、抵抗よりなるＬＣＲ直列接続回路と、このＬＣ
Ｒ直列接続回路の他端と接地との間に直列に接続された
大切可能なスイッチ素子と、上記ＬＣＲ直列接続回路の
両端間に並列に接続された周波数特性補正用コンデンサ
とを備えたことを特徴とするフィルタ回路。(1) A resistor inserted equivalently in series in the signal transmission path,
An LCR series connection circuit consisting of an inductor, a capacitor, and a resistor, one end of which is connected to the output end of this resistor, and this LC
A switch element connected in series between the other end of the R series connection circuit and ground, and a frequency characteristic correction capacitor connected in parallel between both ends of the LCR series connection circuit. Characteristic filter circuit.
により生じる高城しゃ断周波数を信号周波数帯域より高
く設定したことを特徴とする特許請求の範囲第１項記載
のフィルタ回路。(2) The filter circuit according to claim 1, wherein the Takagi cutoff frequency generated by the resistor and the frequency characteristic compensation capacitor is set higher than the signal frequency band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8461584U JPS61322U (en) | 1984-06-05 | 1984-06-05 | filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8461584U JPS61322U (en) | 1984-06-05 | 1984-06-05 | filter circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61322U true JPS61322U (en) | 1986-01-06 |
| JPH0526818Y2 JPH0526818Y2 (en) | 1993-07-07 |
Family
ID=30634280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8461584U Granted JPS61322U (en) | 1984-06-05 | 1984-06-05 | filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61322U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62269407A (en) * | 1986-05-16 | 1987-11-21 | Sony Corp | Filtering device |
-
1984
- 1984-06-05 JP JP8461584U patent/JPS61322U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62269407A (en) * | 1986-05-16 | 1987-11-21 | Sony Corp | Filtering device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0526818Y2 (en) | 1993-07-07 |
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