JPS59152710A - Switching type variable attenuation circuit - Google Patents
Switching type variable attenuation circuitInfo
- Publication number
- JPS59152710A JPS59152710A JP2616383A JP2616383A JPS59152710A JP S59152710 A JPS59152710 A JP S59152710A JP 2616383 A JP2616383 A JP 2616383A JP 2616383 A JP2616383 A JP 2616383A JP S59152710 A JPS59152710 A JP S59152710A
- Authority
- JP
- Japan
- Prior art keywords
- attenuation
- switching
- output
- circuit
- signal
- 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
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/24—Frequency- independent attenuators
- H03H7/25—Frequency- independent attenuators comprising an element controlled by an electric or magnetic variable
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、切替可変減衰回路に関し、詳しくは減衰量の
可変時に発生する雑音を除去する減衰回路に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a switchable variable attenuation circuit, and more particularly to an attenuation circuit that removes noise generated when varying the amount of attenuation.
第１図は従来の切替可変減衰回路の回路図であり、第２
図は第１図−の切替形可変減衰回路の入力信号波形（α
）及び出力信号波形（，６１を示している。第１図にお
いて、１は入力端子、２は出力端子、３．．３’は制御
信号入力端子、 ４ 、４’はＩＣスイッチ、 ５
、５’ 、 ６ 、６’は抵抗である。Figure 1 is a circuit diagram of a conventional switching variable attenuation circuit.
The figure shows the input signal waveform (α
) and output signal waveform (, 61. In Fig. 1, 1 is an input terminal, 2 is an output terminal, 3..3' is a control signal input terminal, 4, 4' is an IC switch, 5
, 5', 6, and 6' are resistances.
以下、第１図及び第２図を用いて従来の切替形可変減衰
回路の動作について説明する。第１図の入力端子１に第
２図（ａ）に示すような入力信号波形を加える。制御信
号入力端子３．３より制御信号を加え、ＩＣスイッチ４
，４をそれぞれ開放あるいは短絡することにより入力信
号波形の減衰量を可変し、入力信号波形に応じて出力信
号波形の振幅を一定にしたり、また入力信号波形に対し
て一定の減衰量を与えることができる。ここで、第２図
（ｂ）に示すように、減衰量を可変するために制御信号
入力端子６，６より制御信号を加えＩＣスイッチ４，４
′を開放または短絡する際、パルス性の雑音Ｎが発生す
る。The operation of the conventional switching type variable attenuation circuit will be described below with reference to FIGS. 1 and 2. An input signal waveform as shown in FIG. 2(a) is applied to the input terminal 1 in FIG. 1. A control signal is added from the control signal input terminal 3.3, and the IC switch 4
, 4 are opened or shorted, respectively, to vary the amount of attenuation of the input signal waveform, to make the amplitude of the output signal waveform constant according to the input signal waveform, or to give a constant amount of attenuation to the input signal waveform. I can do it. Here, as shown in FIG. 2(b), in order to vary the amount of attenuation, a control signal is applied from the control signal input terminals 6, 6 to the IC switches 4, 4.
When opening or shorting ', a pulsed noise N is generated.
これは、ＩＣスイッチ４．４′の回路構成上、ＩＣ゛ス
イッチ内部の電極間の容量により制御信号が伝送信号側
に洩れ込むためであり、そのために、制御信号波形の立
上がり、立下がりをなめ □らかにしたとしても、Ｉ
Ｃスイッチ４，４′の内蔵インバータにより制御信号を
再生するために効果がなく、雑音を減少させることがで
きない４゜このように減衰量切替時に発生する雑音への
ために、伝送波形が特に音声の場合に通話品質が著しく
劣化する欠点があった。This is because the control signal leaks to the transmission signal side due to the capacitance between the electrodes inside the IC switch due to the circuit configuration of the IC switch 4.4'. □Even if I make it clear, I
The built-in inverters of the C switches 4 and 4' are ineffective in reproducing control signals and cannot reduce noise.4 Due to the noise generated when switching the attenuation amount, the transmission waveform is particularly There was a drawback that the call quality deteriorated significantly in the case of
〔発明６目的〕
本発明は、上記欠点に鑑みて発明されたもので、減衰量
切替時に発生するパルス性雑音を除去した切替形可変減
衰回路を提供することを目的とする。[Sixth Object of the Invention] The present invention was invented in view of the above-mentioned drawbacks, and an object of the present invention is to provide a switching type variable attenuation circuit that eliminates the pulse noise generated when switching the attenuation amount.
本発明は、切替形可変減衰回路の出力段忙。 The present invention relates to an output stage of a switched variable attenuation circuit.
出力を切断しあるいは接地する手段を設け、減衰量を切
替えるその前後の時間、上記手段にて出力を切断しある
いは接地することによりパルス性の雑音を除去するよう
になしたことを特徴とする。The present invention is characterized in that a means for cutting off or grounding the output is provided, and pulse noise is removed by cutting off or grounding the output using the above means before and after switching the attenuation amount.
以下図面に示した一実施例により本発明の詳細な説明す
る。The present invention will be explained in detail below with reference to an embodiment shown in the drawings.
第３図は本発明の切替形′可変減衰回路の１実施例回路
図であり、第、１図と同一構成要素には同一番号を付し
ており１本回路においては、特に、Ｉｃ’スイッチ８′
、９及びインバータ１０を付加している。なお７は、ε
ニート信号入力端子である。また第４図は、第３図の切
替形可変減衰回路の各部の波形の１例を示している。FIG. 3 is a circuit diagram of one embodiment of the switching type variable attenuation circuit of the present invention. The same components as in FIGS. 8′
, 9 and an inverter 10 are added. Note that 7 is ε
This is a neat signal input terminal. Further, FIG. 4 shows an example of waveforms of each part of the switching type variable attenuation circuit shown in FIG. 3.
以下、第５図及び第４図を用いて本発明の切替形可変減
衰回路の動作について説明する。第３図の入力端子１に
第４図（ｃｌに示すような入力。Hereinafter, the operation of the switching type variable attenuation circuit of the present invention will be explained using FIGS. 5 and 4. Input as shown in FIG. 4 (cl) to the input terminal 1 in FIG. 3.
信号波形を加える。制御信号入力端子６．３′より制御
信号を加え、ＩＣスイッチ４．４′をそれぞれ開放ある
いは短絡することにより入力信号波形の減衰量を可変し
、出力信号波形の撮幅を可変１−る。この動作は従来回
路と同様であり。Add signal waveform. By applying a control signal from the control signal input terminal 6.3' and opening or shorting the IC switches 4.4', the amount of attenuation of the input signal waveform can be varied, and the width of the output signal waveform can be varied. This operation is similar to the conventional circuit.
従って抵抗５′の出力側には第４図（ｄ）に示すように
減衰量の切替時にパルス性の雑音Ｎが発生している。Therefore, a pulse noise N is generated on the output side of the resistor 5' when the attenuation amount is switched, as shown in FIG. 4(d).
本発明においては、第６図に示すようにＩＣスイッチ８
，９を新たに設け、減衰量の切替時にＳ Ｗ−ト信号入
力端子７より制御信号を加え。In the present invention, as shown in FIG.
, 9 are newly provided, and a control signal is added from the SW-to signal input terminal 7 when switching the attenuation amount.
切替の前後において出力を切断しまた接地するようにな
す。通常／ Ｃ’スイッチ８は短絡、ＩＣスイッチ９は
開放となっており、入力端子１に加えられた波形を減衰
して出力端子２より出力する。そして減衰量の切替時に
は、まず、εニート信号入力端子７より第４図（ｅ）に
示すようなミーート信号を加え、ｌＣスイッチ８を開放
。The output is cut off and grounded before and after switching. Normally, the /C' switch 8 is short-circuited and the IC switch 9 is open, so that the waveform applied to input terminal 1 is attenuated and output from output terminal 2. When switching the attenuation amount, first, a meet signal as shown in FIG. 4(e) is applied from the ε neat signal input terminal 7, and the IC switch 8 is opened.
Ｉ Ｃ”スイッチ９を短絡することにより出力端子２を
接地し、その後制御信号入力端子６，３′に制御信号を
加え、減衰量を変える。従ってへ４・図（ｄｌに示すパ
ルス性の雑音Ｎは、出力端子２が接地されているために
雑音が出力されることはない。そして減衰量を切替えた
後、１（、”スイッチ８及び９をそれぞれ元の短絡及び
開放状態に復帰せしめる。このような動作により、出力
波形は第４図（ｆｌに示すような波形となり、］くルス
性の雑音Ｎは除去されるものである。By shorting the IC" switch 9, the output terminal 2 is grounded, and then a control signal is applied to the control signal input terminals 6 and 3' to change the amount of attenuation. Therefore, the pulse noise shown in Figure 4 (dl) Since the output terminal 2 of N is grounded, no noise is output. After switching the attenuation amount, 1(," returns the switches 8 and 9 to their original short-circuited and open states, respectively. With this operation, the output waveform becomes the waveform shown in FIG. 4 (fl), and the turbulent noise N is removed.
以上述べたように１本発明により減衰量の切替時に発生
するパルス性の雑音を除去することができ、伝送波形が
音声の場合１通話品質を劣化させることなく波形を伝送
できるものである。。As described above, according to the present invention, it is possible to remove the pulse noise generated when switching the attenuation amount, and when the transmission waveform is voice, the waveform can be transmitted without deteriorating the call quality. .
第１図は従来の切替形可変減衰回路、第２図は第１図の
回路の入力信号と出力信号の波形図。
第３図は本発明による切替可変減衰回路の７−実施例回
路図、第４図は第３図の回路の各部の波形図である。
６・・・制御信号入力端子。
４．４′・・・ＩＣスイッチ。
５ 、５′、 ６ 、６’・・・抵抗。
７・・・εニート信号入力端子。
８．９・・・ＩＣスイッチ。
１０・・・インバータ。
代世人弁理士 高 橋 明 夫
第 １（２）
第１
＋Ｖ 〜 へ第 ３必
ワ
第 １
＝５FIG. 1 is a conventional switching type variable attenuation circuit, and FIG. 2 is a waveform diagram of an input signal and an output signal of the circuit of FIG. FIG. 3 is a circuit diagram of a seventh embodiment of the switching variable attenuation circuit according to the present invention, and FIG. 4 is a waveform diagram of each part of the circuit of FIG. 6...Control signal input terminal. 4.4'...IC switch. 5, 5', 6, 6'...resistance. 7...ε NEET signal input terminal. 8.9...IC switch. 10...Inverter. Generation Patent Attorney Akio Takahashi No. 1 (2) No. 1 +V ~ To No. 3 Necessary Wa No. 1 = 5
Claims (1)
るようにした減衰回路において、上記減衰回路の出力段
に、該出力を切断または接地する手段を設け、よ記減衰
量の切替前後において該手段を駆動せしめるようにして
構成され。 上記切替時に発生する雑音を除去するようにしたことを
特徴とする切替形可変減衰回路。[Scope of Claims] In an attenuation circuit in which the amount of attenuation is varied by controlling a changeover switch, the output stage of the attenuation circuit is provided with means for cutting off or grounding the output, and The device is configured to drive the means before and after switching. A switching type variable attenuation circuit characterized in that the noise generated at the time of switching is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2616383A JPS59152710A (en) | 1983-02-21 | 1983-02-21 | Switching type variable attenuation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2616383A JPS59152710A (en) | 1983-02-21 | 1983-02-21 | Switching type variable attenuation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59152710A true JPS59152710A (en) | 1984-08-31 |
Family
ID=12185878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2616383A Pending JPS59152710A (en) | 1983-02-21 | 1983-02-21 | Switching type variable attenuation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59152710A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0210783A2 (en) * | 1985-07-23 | 1987-02-04 | Hewlett-Packard Company | Pin diode switched RF step attenuator |
| JPH0422207A (en) * | 1990-05-16 | 1992-01-27 | Matsushita Electric Ind Co Ltd | Attenuator |
-
1983
- 1983-02-21 JP JP2616383A patent/JPS59152710A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0210783A2 (en) * | 1985-07-23 | 1987-02-04 | Hewlett-Packard Company | Pin diode switched RF step attenuator |
| JPH0422207A (en) * | 1990-05-16 | 1992-01-27 | Matsushita Electric Ind Co Ltd | Attenuator |
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