TWI275251B - Audio digital to analog converter with harmonic suppression - Google Patents
Audio digital to analog converter with harmonic suppression Download PDFInfo
- Publication number
- TWI275251B TWI275251B TW093108461A TW93108461A TWI275251B TW I275251 B TWI275251 B TW I275251B TW 093108461 A TW093108461 A TW 093108461A TW 93108461 A TW93108461 A TW 93108461A TW I275251 B TWI275251 B TW I275251B
- Authority
- TW
- Taiwan
- Prior art keywords
- threshold
- circuit
- dac
- receiving
- input
- Prior art date
Links
- 230000001629 suppression Effects 0.000 title description 4
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000001502 supplementing effect Effects 0.000 claims 1
- 229920005994 diacetyl cellulose Polymers 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
- H03M1/0634—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale
- H03M1/0656—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale in the time domain, e.g. using intended jitter as a dither signal
- H03M1/066—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale in the time domain, e.g. using intended jitter as a dither signal by continuously permuting the elements used, i.e. dynamic element matching
- H03M1/0663—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale in the time domain, e.g. using intended jitter as a dither signal by continuously permuting the elements used, i.e. dynamic element matching using clocked averaging
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/0614—Continuously compensating for, or preventing, undesired influence of physical parameters of harmonic distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
- H03M1/0675—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy
- H03M1/0678—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy using additional components or elements, e.g. dummy components
- H03M1/068—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy using additional components or elements, e.g. dummy components the original and additional components or elements being complementary to each other, e.g. CMOS
- H03M1/0682—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence using redundancy using additional components or elements, e.g. dummy components the original and additional components or elements being complementary to each other, e.g. CMOS using a differential network structure, i.e. symmetrical with respect to ground
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Analogue/Digital Conversion (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Description
1275251 玖、發明說明·· 【發明所屬之技術領域】 本發明係關於一種具有諧波抑制功能之聲頻數位-類 比轉換器。 【先前技術】 數位-類比轉換器（DAC)係時下聲頻電路之基本架構， 在許多產品之成本及操作上構成很大衝擊。雖然在某些應 用上可製得價廉之低級數位-類比轉換器（l〇w end DAC)， 但此等價廉之DAC具有雜訊誤差（noise errors)之缺失。 尤其會在偶奇諧波（even and odd harmonics)中產生誤 差，導致聲頻輸出品質之低劣。雖然可製出高品質之DAC 來解消這些誤差，但目前之高級DAC構造複雜，價格高昂。 因此，亟需要一種比目前之DAC具有少誤差且又價廉 之改良聲頻DAC。由以下之說明可知，本發明已巧適的解 決上述先前技術之缺失。 【發明内容】 本發明提供一種比目前之價廉的DAC且又比高級DAC 便宜之具有較少誤差之改良聲頻DAC。即，本發明提供一 種運用數位信號處理校正（更正）產生於低級DAC中之誤 差的系統及方法。該數位信號處理提供，種可實質的消除 DAC輸出誤差之偶奇諧波的方法。因此，運用此數位處理 技術可改進構造較不複雜及價廉之低级（low end)DAC的操 作性能。結果可以廉價（包括聲頻晶片上電路之佈局及大 小）提供具有一如高級（high end)DAC之高品質DAC。以下 1275251 之說明包括本發明之實施例。但本發明之範圍不侷限於所 提示之實施例，而應由所附之專利申請範圍及其等效物來 界定。 消除系統之誤差之偶（數）諧波（even harmonics)的方 法為習知，以往俗稱為"auto zero”。此習知之方法之一為 使用截波（chop wave)。在頻率領域（即頻域）中，以往之 偶諧波抑制被認為可把信號誤差之偶諧波移動包圍截波頻 率（chopping frequency)。第1圖為習知DAC之構造簡圖。 圖中DAC輸出，Vout，係Vlo及Vhi之間之電壓，它是與 輸入碼Din成比例。此種習知之DAC可具二次或較高次之 諧波且可精確到少至9或10位元之譜。 【實施方式】 依本發明，使用第2圖所示之改良電路時，可消除偶 諧波。其DAC可輸出VI及V2(DAC之高及低信號界線）之間 之輸出電壓Vont。該VI及V2係分別由開關Swl及Sw2 導出。該等開關係根據截波信號（chop signal)振盪，由Vhi 反向轉換至Vlo。然後經由乘法器Ml，將Din乘以負1( 一 1 )之乘值輸入至DAC中。 在此電路中，一如第1圖之習知電路，DAC產生一介 於Vlo及Vhi之輸出。但，本發明之改良電路可將Vlo及 Vhi之任務（role)反轉。若是其任務被反轉，與此同時，輸 入至DAC之值被負化（negated)，或乘以負1( — 1)，偶數譜 波或稱偶諧波即被移動至頻帶（band)外。此截波輸入信號 (chop input signal)在頻率 256Fs 或約 lOMhz 運作（runs)，該 等偶諧波可完全被移除至Fs/2頻帶之外。 1275251 正當(？)= 當該額外信號移動DAC進::J 誤差。隨後， (-))則輸出信號將且c性區内（此區誤差為負 :合、士匕饭疋為事實’則上述方式為不可行’蓋因該誤差 ^會被交#地轉換為正（+)及負（-)。但，此不致於發 口為截波L號，縱使諧波抑制法已去除不改變正負號 之任何誤差信號，仍係DAC特性上之一偶諧信號。因此: ，術之組合，即截波器及頻帶外之額外信號可一起抑制偶 奇諧波。 上面已就以廉價（包括聲頻晶片上電路之佈局及大小） 提供具有一如高級DAC之高品質DAC加以說明。此說明包 括本發明之可取實施例。但，本發明之範圍不受所舉實施 例之限制，應依所附申請專利範圍及其等效物界定。
Claims (1)
1275251 |呢年7月丨牛日修(更)正替換頁 第93108461號專利申請案 、補充、修正後無劃線之說明書修正頁一式三份 拾、申請專利範圍： 1. 一種數位-類比轉換器（DAC)，包括：
第一電路，用以去除輸出信號之偶波誤差，該第一電 路備有：用以接收第一閾值之第一閾輸入及用以接收第二 閾值之第二閾輸入之第一 DAC模組，該二閾輸入界定一 在低電壓閾及高電壓閾之間變化之閾值範圍；及用以使該 第一及第二閾輸入之間之閾值反向之轉接（開關）電路； 第二電路，用以去除輸出信號之奇諧波誤差，該第二 電路備有：用以接收第三閾值之第三閾輸入及用以接收第 四閾值之第四閾輸入之第二DAC模組，該第三及第四閾輸 入界定一在低電壓閥及高電壓閾之間變化之閾值範圍；及 用以使該第一及第二閾輸入之間之閾值反向之轉接電路； 及一差動放大器，用以接收第一電路之輸出及第二電路之 已反向輸出（invert erd output)，並傳輸一輸出信號。
11
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US45890203P | 2003-03-28 | 2003-03-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW200505172A TW200505172A (en) | 2005-02-01 |
| TWI275251B true TWI275251B (en) | 2007-03-01 |
Family
ID=33131838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW093108461A TWI275251B (en) | 2003-03-28 | 2004-03-29 | Audio digital to analog converter with harmonic suppression |
Country Status (3)
| Country | Link |
|---|---|
| US (2) | US6897795B2 (zh) |
| TW (1) | TWI275251B (zh) |
| WO (1) | WO2004088847A2 (zh) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2322042B (en) * | 1997-02-05 | 2002-02-06 | Ericsson Telefon Ab L M | Radio architecture |
| EP1596625A1 (en) * | 2004-05-11 | 2005-11-16 | AKG Acoustics GmbH | Circuit for the control of a loudspeaker |
| US7450044B2 (en) * | 2007-03-27 | 2008-11-11 | Agilent Technologies, Inc. | Sub-harmonic image mitigation in digital-to-analog conversion systems |
| US7619549B2 (en) * | 2007-10-18 | 2009-11-17 | Honeywell International Inc. | Methods and systems for reducing a sign-bit pulse at a voltage output of a sigma-delta digital-to-analog converter |
| US9385741B2 (en) | 2014-10-27 | 2016-07-05 | Mediatek Inc. | Digital-to-analog conversion apparatus for generating combined analog output by combining analog outputs derived from using different sampling clocks and related method thereof |
| JP2019161622A (ja) * | 2018-03-16 | 2019-09-19 | 旭化成エレクトロニクス株式会社 | Ｄａ変換装置およびｄａ変換方法 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4289403A (en) * | 1977-03-04 | 1981-09-15 | Isco, Inc. | Optical phase modulation instruments |
| US5363856A (en) * | 1993-08-13 | 1994-11-15 | Abbott Laboratories | Correcting thermal drift in cardiac output determination |
| US5537435A (en) * | 1994-04-08 | 1996-07-16 | Carney; Ronald | Transceiver apparatus employing wideband FFT channelizer with output sample timing adjustment and inverse FFT combiner for multichannel communication network |
| US6324030B1 (en) * | 1995-05-02 | 2001-11-27 | International Business Machines Corporation | Digital pes demodulation for a disk drive servo control system using synchronous digital sampling |
| US6580314B1 (en) * | 2000-10-11 | 2003-06-17 | The United States Of America As Represented By The Secretary Of The Navy | Demodulation system and method for recovering a signal of interest from a modulated carrier sampled at two times the phase generated carrier frequency |
| US7034611B2 (en) * | 2004-02-09 | 2006-04-25 | Texas Instruments Inc. | Multistage common mode feedback for improved linearity line drivers |
-
2004
- 2004-03-26 US US10/810,314 patent/US6897795B2/en not_active Expired - Fee Related
- 2004-03-26 WO PCT/US2004/009348 patent/WO2004088847A2/en not_active Ceased
- 2004-03-29 TW TW093108461A patent/TWI275251B/zh not_active IP Right Cessation
-
2005
- 2005-04-26 US US11/115,974 patent/US6987475B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US6897795B2 (en) | 2005-05-24 |
| WO2004088847A3 (en) | 2005-05-12 |
| WO2004088847A2 (en) | 2004-10-14 |
| US6987475B2 (en) | 2006-01-17 |
| US20050219104A1 (en) | 2005-10-06 |
| US20040212525A1 (en) | 2004-10-28 |
| TW200505172A (en) | 2005-02-01 |
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| MM4A | Annulment or lapse of patent due to non-payment of fees |