JP4800688B2 - ミューティング回路を設けた半導体集積回路 - Google Patents
ミューティング回路を設けた半導体集積回路 Download PDFInfo
- Publication number
- JP4800688B2 JP4800688B2 JP2005200161A JP2005200161A JP4800688B2 JP 4800688 B2 JP4800688 B2 JP 4800688B2 JP 2005200161 A JP2005200161 A JP 2005200161A JP 2005200161 A JP2005200161 A JP 2005200161A JP 4800688 B2 JP4800688 B2 JP 4800688B2
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- JP
- Japan
- Prior art keywords
- muting
- transistor
- semiconductor integrated
- state
- integrated circuit
- 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.)
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- 239000004065 semiconductor Substances 0.000 title claims description 20
- 239000003990 capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
- H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits
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- Amplifiers (AREA)
Description
11〜14,30〜39 抵抗
15 スイッチ
16 電流源
17,27 アンプ
18,28 容量
21〜24 MOSトランジスタ
25 インバータ
26 外付け容量
Claims (2)
- MOSトランジスタのミューティングトランジスタと、前記ミューティングトランジスタのドレイン端子に入力される信号に応じ、前記ミューティングトランジスタのゲートとドレイン端子間に接続された、第1の抵抗と第2のMOSトランジスタとトランジスタの直列接続体、および、前記ミューティングトランジスタのバックゲートとドレイン端子間に接続された第2の抵抗によって、前記ミューティングトランジスタのゲートとバックゲートの電圧を制御する手段とを備え、
非ミューティング状態のときに前記ミューティングトランジスタのドレイン端子にマイナス電圧が印加されてもクリップしないことを特徴とするミューティング回路を設けた半導体集積回路。 - 電源オフを検出して前記ミューティングトランジスタを動作させ自動的にミューティング状態にする手段を備えたことを特徴とする請求項1記載のミューティング回路を設けた半導体集積回路。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005200161A JP4800688B2 (ja) | 2005-07-08 | 2005-07-08 | ミューティング回路を設けた半導体集積回路 |
US11/481,158 US7940940B2 (en) | 2005-07-08 | 2006-07-05 | Muting circuit and semiconductor integrated circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005200161A JP4800688B2 (ja) | 2005-07-08 | 2005-07-08 | ミューティング回路を設けた半導体集積回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007019948A JP2007019948A (ja) | 2007-01-25 |
JP4800688B2 true JP4800688B2 (ja) | 2011-10-26 |
Family
ID=37618338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005200161A Active JP4800688B2 (ja) | 2005-07-08 | 2005-07-08 | ミューティング回路を設けた半導体集積回路 |
Country Status (2)
Country | Link |
---|---|
US (1) | US7940940B2 (ja) |
JP (1) | JP4800688B2 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007096731A (ja) * | 2005-09-29 | 2007-04-12 | Matsushita Electric Ind Co Ltd | ミュート回路 |
KR100839487B1 (ko) * | 2006-10-16 | 2008-06-19 | 삼성전자주식회사 | 팝업 노이즈 방지 회로, 이를 포함하는 디지털 앰프 및디지털 앰프의 팝업 노이즈 방지 방법 |
US8218793B2 (en) * | 2006-12-11 | 2012-07-10 | Mediatek Inc. | Apparatus and muting circuit |
US8138828B2 (en) | 2010-03-30 | 2012-03-20 | Texas Instruments Incorporated | Active mute scheme for an amplifier |
US8526635B2 (en) * | 2010-07-01 | 2013-09-03 | Conexant Systems, Inc. | Grounding switch method and apparatus |
JP7305162B2 (ja) * | 2019-06-19 | 2023-07-10 | 株式会社オーディオテクニカ | 音電気変換装置 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58172019A (ja) * | 1982-04-01 | 1983-10-08 | Nec Corp | 半導体スイツチ回路 |
JPH0821911B2 (ja) | 1988-06-01 | 1996-03-04 | 株式会社日立製作所 | デジタル音声出力制御装置 |
JP3254972B2 (ja) | 1995-07-25 | 2002-02-12 | 松下電工株式会社 | 音声ミュート回路 |
US6016352A (en) * | 1997-11-20 | 2000-01-18 | Intel Corporation | Low distortion audio muting circuit |
JP3814118B2 (ja) * | 2000-02-28 | 2006-08-23 | ローム株式会社 | ミュート回路およびオーディオ増幅回路 |
JP2002111446A (ja) * | 2000-09-26 | 2002-04-12 | Mitsumi Electric Co Ltd | ミュート回路 |
JP4497265B2 (ja) * | 2001-03-08 | 2010-07-07 | ミツミ電機株式会社 | ミュート回路 |
JP4878092B2 (ja) | 2001-07-06 | 2012-02-15 | 旭化成エレクトロニクス株式会社 | ミュート回路 |
JP2003318656A (ja) * | 2002-04-23 | 2003-11-07 | Sanyo Electric Co Ltd | ショック音防止回路 |
JP2004320490A (ja) * | 2003-04-16 | 2004-11-11 | Mitsumi Electric Co Ltd | ミューティング回路 |
-
2005
- 2005-07-08 JP JP2005200161A patent/JP4800688B2/ja active Active
-
2006
- 2006-07-05 US US11/481,158 patent/US7940940B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US20070009110A1 (en) | 2007-01-11 |
US7940940B2 (en) | 2011-05-10 |
JP2007019948A (ja) | 2007-01-25 |
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