TW201105029A - An improved self oscillation audio amplifier and a method for retraining audio distortion of the improved self oscillation audio amplifier - Google Patents
An improved self oscillation audio amplifier and a method for retraining audio distortion of the improved self oscillation audio amplifier Download PDFInfo
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201105029 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種自我振盪音頻放大器，尤指具有抑 制失真功能之自我振盪音頻放大器，及其抑制音頻放大器 音頻失真之方法。 【先前技術】 音頻放大器係為驅動揚聲器之重要裝置，常見之音頻 • 放大器有AB類放大器及D類放大器，其中，〇類放大器 之效率又比AB類放大器之效率，高了二至五倍且相 較於AB類放大器，D類放大器所需之電源與功率損耗 (power dissipation)明顯地減小。 D類放大器主要係利用PWM( pulse Width Modulati〇n ) 調變技術將輸入音頻訊號轉變成為開關控制訊號，藉以控 制電力電子元件之導通與關閉，而達到放大音頻訊號之目 ® 的，除此之外，D類放大器本身包含的電感一電容（LC) 濾波器可在D類放大器工作的每個周期儲存足夠之能量， 使得控制電力電子元件於導通與關閉之時，不會在D類放 大器之負載端，例如一揚聲器端，造成功率之損耗（p〇wer dissipation ) 0 D類放大器之脈衝調變技術係可利用積分器之自我振 盪，或，藉由三角波產生器，以產生三角波訊號，之後， 再藉由比較器於執行比較後’輸出脈衝調變訊號。如第一 201105029 圖所示，係習知技術之自我振盪之音訊放大器之電路結構 圖，一種自我振盪之音訊放大器100，其主要包括：一音 頻訊號104、一時脈切換開關128、一時脈輸入源116、一 子音訊放大器106、一前置驅動器108、一電晶體組11()、 一濾波器電感112、一濾波器電容114、及一揚聲器12〇， 其中，接著如第二圖所示，係習知技術之自我振盪之音訊 放大器之子音訊放大器之電路結構圖，該子音訊放大器1〇6 • 主要係由一電阻124、一電容134、一比較器122、及一比 較器132所組成，係可將一音頻訊號轉換成一三角波訊 號’且’透過該比較器132可將該三角波訊號與一外加參 考電壓VREF進行比較，比較器132會後則輸出一脈衝調 變訊號。 如上述習知技術之自我振盪之音訊放大器1〇〇，係以 該子音訊放大器106之自我振盪，以達成音訊放大及脈衝 •調變之目的，其雖可高效率地輸出音頻訊號至揚聲器η。， 亦可藉由回授電阻回應輸入音頻訊號，但是，雖然積分器 電路可於無輸入音頻訊號的狀態下形成自我振盡，以達到 較低之失真’然而’卻無法抑制由於過高之功率輸出，所 造成之音頻訊號失真現象 因此，本案之發明人有鑑於習知之技術仍具各項隱含 之缺失&極力加以改良創新，終於研發完成本發明之一 種改良之自我振盈音頻放大器及抑制該自我振盛音頻放大 201105029 器之方法。 【發明内容】 本發明之主要目的，在於提供一種改良之自我㈣音 頻放大器，藉由使用抑制失真之電路，以偵測並有效地抑 制輸出端之音頻信號失真。 本發月之另目的，在於提供—種抑制自我振盛音頻 放大器音頻失真之方法，該方法係利用簡單的邏輯間與正 反器之配合，以防止音頻放大器於高增益輸出時，造成之 音頻訊號失之真現象，以保持揚聲器高品質之輸出。 為了達到上述之主要目的，本發明人研發完成一種改 良之自我振盪音頻放大器’㉟改良之自我振t音頻放大器 係包括：-訊號放大單t 1少_個自我㈣調變單元: 至少-個閘級驅動單元；至少-組輸出電晶體組；一音頻 放大器正輸㈣；一音頻放大器負輸出端；及—抑制失真 單元，係包括：至少一個D型正反器；及 久芏）一個反互斥 或邏輯閘。 本發明提供 另外，為了達到如上述說明之另—目@ 了一種抑制自我振盪音頻放大器音頻失直 穴具之方法，該抑制 自我振盪音頻放大器音頻失真之方法係句、 ’、括以下步驟：（1 ) 一訊號放大單元接收及放大一音頻訊號. j ，、2)—自我振盪 調變單元接收一放大音頻訊號以執行脈衝調變 級驅動單元接收該自我振盪調變單元所輪 間 «坩之一脈衝調變 201105029 訊號以控制一輸出電晶體 电日曰體組，（4)該輸出電晶體組輸出一 調變音頻訊號至一音頻放大 大盗正輸出端與一音頻放大器負 輸出端，（5 ) —拍7制生吉。W - Μ似 制失真早70判斷輸出於該音頻放大器正 輸出端與該音頻放大器負輸出端之該調變音頻訊號是否失 真’若是，則執行步驟（6)’若否，則執行步驟⑺;⑷ 該抑制失真單元抑制調變音頻訊號失真；&⑺音頻放大BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-oscillating audio amplifier, and more particularly to a self-oscillating audio amplifier having a distortion suppression function and a method of suppressing audio distortion of an audio amplifier. [Prior Art] Audio amplifiers are important devices for driving speakers. Common audio amplifiers have class AB amplifiers and class D amplifiers. Among them, the efficiency of the class amplifier is two to five times higher than that of the class AB amplifier. Compared to Class AB amplifiers, the power and power dissipation required for Class D amplifiers is significantly reduced. Class D amplifiers mainly use PWM (pulse Width Modulati〇n) modulation technology to convert the input audio signal into a switching control signal, thereby controlling the conduction and deactivation of the power electronic components to achieve the purpose of amplifying the audio signal. In addition, the Class-D amplifier itself contains an Inductor-Capacitor (LC) filter that stores enough energy per cycle of Class D operation to control the power electronics when turned on and off, not in Class D amplifiers. The load end, such as a speaker end, causes power loss. The pulse modulation technique of the class D amplifier can utilize the self-oscillation of the integrator, or, by a triangular wave generator, to generate a triangular wave signal, after which Then, the comparator outputs a pulse modulation signal after performing the comparison. As shown in the first 201105029, there is a circuit diagram of a self-oscillating audio amplifier of the prior art, a self-oscillating audio amplifier 100, which mainly includes an audio signal 104, a clock switch 128, and a clock input source. 116, a sub audio amplifier 106, a pre-driver 108, a transistor group 11 (), a filter inductor 112, a filter capacitor 114, and a speaker 12, wherein, as shown in the second figure, A circuit diagram of a sub-audio amplifier of a self-oscillating audio amplifier of the prior art. The sub-audio amplifier 1〇6 is mainly composed of a resistor 124, a capacitor 134, a comparator 122, and a comparator 132. The audio signal can be converted into a triangular wave signal 'and' through the comparator 132 to compare the triangular wave signal with an applied reference voltage VREF, and the comparator 132 outputs a pulse modulated signal. The self-oscillating audio amplifier 1A of the above-mentioned prior art self-oscillates the sub-audio amplifier 106 to achieve audio amplification and pulse modulation, which can efficiently output audio signals to the speaker η. . The input audio signal can also be responded to by the feedback resistor. However, although the integrator circuit can form self-excitation in the state without input audio signal, the lower distortion can be achieved. However, the power cannot be suppressed due to excessive power. The audio signal distortion caused by the output, therefore, the inventor of the present invention has developed an improved self-vibration audio amplifier and the present invention in view of the implied omissions of the prior art. The method of suppressing the self-vibration audio amplification 201105029. SUMMARY OF THE INVENTION A primary object of the present invention is to provide an improved self (tetra) audio amplifier that detects and effectively suppresses distortion of an audio signal at an output by using a circuit that suppresses distortion. Another purpose of this month is to provide a method for suppressing the audio distortion of the self-vibrating audio amplifier. The method utilizes a simple logic and a flip-flop to prevent the audio amplifier from being caused by the high gain output. The signal is lost to maintain the high quality output of the speaker. In order to achieve the above main purpose, the inventors have developed an improved self-oscillating audio amplifier '35 modified self-vibrating t-amplifier system including: - signal amplification single t 1 less _ self (four) modulation unit: at least - one gate Stage drive unit; at least - group output transistor group; an audio amplifier forward (four); an audio amplifier negative output; and - suppression distortion unit, including: at least one D-type flip-flop; and a long time) an anti-mutation Reject or logic gate. In addition, in order to achieve the method of suppressing the self-oscillating audio amplifier audio straightening hole, the method for suppressing the audio distortion of the self-oscillating audio amplifier is described in the following sentence: 1) a signal amplifying unit receives and amplifies an audio signal. j, 2) - the self-oscillating modulation unit receives an amplified audio signal to perform a pulse modulation level driving unit to receive the self-oscillating modulation unit A pulse modulation 201105029 signal to control an output transistor electric corona body group, (4) the output transistor group outputs a modulated audio signal to an audio amplification thief positive output terminal and an audio amplifier negative output terminal, (5) ) — Shoot 7 to make a living. W - Μ 制 早 早 早 早 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断 判断(4) The suppression distortion unit suppresses distortion of the modulated audio signal; & (7) audio amplification
器正輸出端與音頻放大器負輸出端輸出調變音頻訊號以驅 動一揚聲器。 【實施方式】 為了能夠更清楚地描述本發明所提出之一種改良之自 我振盪音頻放大器及其方法，以下將配合圖示，詳盡說明 之。 請參閱第三圖，係一種改良之自我振盪音頻放大器之 電路結構圖，較佳地，該改良之自我振盪音頻放大器丄， _ 係包括： 一訊號放大單元（input amplifier unit) 2，係耗接一 音訊源104以接收一音頻訊號並將其放大為一放大音頻訊 號’同時§青參閱第四圖’係該訊號放大單元之電路結構圖， 訊號放大單元2包括：一完全差動放大器（fully diffefential amplifier) 21，係具有一差動放大器正輸入端vin+、一差 動放大器負輸入端Vin-、一差動放大器正輸出端v〇ut+、 及一差動放大器負輸出端Vout-，該差動放大器正輸入端 201105029The positive output of the device and the negative output of the audio amplifier output a modulated audio signal to drive a speaker. [Embodiment] In order to more clearly describe an improved self-oscillating audio amplifier and method thereof according to the present invention, the following will be described in detail with reference to the drawings. Please refer to the third figure, which is a circuit structure diagram of an improved self-oscillating audio amplifier. Preferably, the improved self-oscillating audio amplifier 丄, _ includes: an input amplifier unit 2 An audio source 104 receives an audio signal and amplifies it into an amplified audio signal. Meanwhile, the fourth circuit diagram is a circuit configuration diagram of the signal amplifying unit. The signal amplifying unit 2 includes: a fully differential amplifier (fully Diffefential amplifier 21 has a differential amplifier positive input terminal vin+, a differential amplifier negative input terminal Vin-, a differential amplifier positive output terminal v〇ut+, and a differential amplifier negative output terminal Vout-, the difference Active amplifier input terminal 201105029
Vin+與該差動放大器負輸入端Vin_係耦接該音訊源ι〇4以 接收音頻訊號，且該差動放大器正輸出端Vout+與該差動 放大器負輸出端Vout-係耦接下一級之一自我振盪調變單 元3,完全差動放大器21於將音頻訊號作訊號放大後，即 輸出該放大音頻訊號至自我振盪調變單元3; 一第一可變 電阻（variable resistor) RV1，係耦接於差動放大器正輸入 端Vin +與差動放大器負輸出端v〇ut_之間，藉由調整該第 籲一可變電阻RV1之電阻值，可調變差動放大器負輸出端 Vout-所輸出之放大音頻訊號之增益大小；及一第二可變電 阻（variable resistor) RV2,係耦接於差動放大器負輸入端 Vin與差動放大器正輸出端v〇ut+之間，藉由調整該第二可 變電阻RV2之電阻值，可調變差動放大器正輸出端v〇ut + 所輸出之放大音頻訊號之增益大小； 二個該自我振盪調變單元（self_〇scillati〇n modulation Φ unit ) 3，係耦接於該訊號放大單元2，以接收該放大音頻 訊號’並藉由自我振盪之方式執行放大音頻訊號之脈衝調 變後，輸出一脈衝調變訊號，同時請參閱第五圖，係自我 振盪調變單元之電路結構圖，自我振盪調變單元3包括： 一積分器（integrator ) 31’係連接於該訊號放大單元2， 以接收放大音頻訊號’並產生自我振盪以將放大音頻訊號 轉換成一二角波訊號，該積分器31包括：一積分器電阻 (integrator resistor ) Rint，該積分器電阻Rint係耦接於訊 201105029 號放大單7L 2’以作為放大音頻訊號輸入積分器31之緩 衝’積为器電谷（integrator capacitor ) Cint，該積分器 電谷Cint係輕接於積分器電阻Rint，當放大音頻訊號藉由 積分器電阻Rint輸入積分器31後，積分器電容cint即執 打充電與放電；及一運算放大器（OPA ) 3丨丨，係具有一運 算放大器正輸入端3112、一運算放大器負輸入端3111、及 運算放大器輸出端3113，該運算放大器正輸入端3112 係耦接於一外加參考電壓VREF，該運算放大器負輸入端 31丨1則麵接積分器電阻Rint，當積分器電容cint重覆地執 行充電與放電，該運算放大器311即可輸出具週期性之該 —角波§fl號’及一比較器（comparator) 32，係具有一比較 器正輸入端321、一比較器負輸入端322、及一比較器輸出 端323，该比較器正輸入端321係耗接該運算放大器輸出 端3113,且，該比較器負輸入端322係耦接該外加參考電 壓VREF，該比較器輸出端323則耦接下一級之一閘極驅動 單元4,且於接收三角波訊號後，即執行三角波訊號與外 加參考電壓VREF之比較，並輸出該脈衝調變訊號至該閘 級驅動單元4 ; 二個該閘級驅動單元（gate drive unit) 4，係耦接於該 自我振堡調變單元3以接收該脈衝調變訊號，且，閘級驅 動單元4可基於脈衝調變訊號以控制下一級之一輸出電晶 體組輸出電晶體組5之導通與關閉； 201105029 二組該輸出電晶體 辆接於該閘級驅動單元 盪調變單元3所輸出之 組（output stage transistor) 5，係 4 ’閘級驅動單元4於接收自我振 該脈衝調變訊號之後，基於此脈衝 調變訊號以控制該輸出電 輸出電晶體組輸出一調變 晶體組5之導通與關閉，以使得 音頻訊號於該音頻放大器正輸出 端〇Ut與該音頻放大器負輸出端Outb以驅動-揚聲器12〇;Vin+ and the differential amplifier negative input terminal Vin_ are coupled to the audio source ι〇4 to receive an audio signal, and the differential amplifier positive output terminal Vout+ is coupled to the differential amplifier negative output terminal Vout- a self-oscillating modulation unit 3, the full differential amplifier 21, after amplifying the audio signal, outputs the amplified audio signal to the self-oscillation modulation unit 3; a first variable resistor (RV1), coupled Connected between the positive input terminal Vin + of the differential amplifier and the negative output terminal v〇ut_ of the differential amplifier, the negative output terminal Vout- of the differential amplifier can be adjusted by adjusting the resistance value of the first variable resistor RV1. The gain of the amplified audio signal is output; and a second variable resistor RV2 is coupled between the negative input terminal Vin of the differential amplifier and the positive output terminal v〇ut+ of the differential amplifier by adjusting The resistance value of the second variable resistor RV2 is adjustable by the gain of the amplified audio signal outputted by the positive output terminal v〇ut + of the differential amplifier; two self-oscillation modulation units (self_〇scillati〇n modulation Φ unit ) 3, The signal amplifying unit 2 is coupled to receive the amplified audio signal and perform a pulse modulation of the amplified audio signal by self-oscillating, and then output a pulse modulation signal, and refer to the fifth figure, which is self-oscillating. The circuit structure diagram of the modulation unit, the self-oscillating modulation unit 3 includes: an integrator 31' is connected to the signal amplifying unit 2 to receive the amplified audio signal ' and generate self-oscillation to convert the amplified audio signal into A two-dimensional wave signal, the integrator 31 includes: an integrator resistor Rint coupled to the amplifier 11L 2' of the 201105029 to be used as a buffer for the amplified audio signal input integrator 31. The integrator capacitor Cint is connected to the integrator resistor Rint. When the amplified audio signal is input to the integrator 31 by the integrator resistor Rint, the integrator capacitor cint is hit. Charging and discharging; and an operational amplifier (OPA) 3丨丨 having an operational amplifier positive input terminal 3112 and an operational amplifier negative input terminal 31 11. The operational amplifier output terminal 3113, the operational amplifier positive input terminal 3112 is coupled to an applied reference voltage VREF, and the operational amplifier negative input terminal 31丨1 is connected to the integrator resistor Rint, when the integrator capacitance cint is repeated. The charging and discharging are performed, and the operational amplifier 311 can output the periodicity-the angular wave §fl number and a comparator 32 having a comparator positive input terminal 321 and a comparator negative input terminal. 322, and a comparator output 323, the comparator positive input terminal 321 is connected to the operational amplifier output terminal 3113, and the comparator negative input terminal 322 is coupled to the external reference voltage VREF, the comparator output terminal 323 is coupled to one of the gate driving units 4 of the next stage, and after receiving the triangular wave signal, performs comparison of the triangular wave signal with the applied reference voltage VREF, and outputs the pulse modulation signal to the gate driving unit 4; The gate drive unit 4 is coupled to the self-vibration modulation unit 3 to receive the pulse modulation signal, and the gate drive unit 4 can be controlled based on the pulse modulation signal. One of the output transistor group output transistor group 5 is turned on and off; 201105029 two sets of the output transistor device is connected to the gate stage driving unit oscillating modulation unit 3 output stage transistor 5, system 4 After receiving the self-oscillation pulse modulation signal, the gate drive unit 4 controls the output electrical output transistor group to output the turn-on and turn-off of the modulation crystal group 5 based on the pulse modulation signal, so that the audio signal is The audio amplifier is outputting 〇Ut and the audio amplifier negative output terminal Outb to drive the speaker 12〇;
一抑制失真單元（distortion restraint unit) 6，係耦接 該曰頻放大器正輸出端〇ut、該音頻放大器負輸出端 〇咖、及該訊號放大單元2,該抑制失真單元6係、可價測 輸出於音頻放大器正輸出端Out與音頻放大器負輸出端 Outb之該調變音頻訊號是否已經失真並抑制其失真同 時明參閱第八圖’係抑制失真單元之電路結構圖，抑制失 真單元6包括：一第一正反器組（fliP-fl〇p set) 01，係耦 接音頻放大器正輸出端〇ut與該訊號放大單元2，該第— 正反器組61可接收輸出電晶體組5輸出於音頻放大器正輸 出端Out之調變音頻訊號，且，當調變音頻訊號持續維持 高（低）準位超過兩個時脈訊號週期之時，第一正反器組 61即依其特性反應而輸出一第一調整訊號至訊號放大單元 2,以調整放大音頻訊號之增益，第一正反器組61包括： 一第一 D型正反器（Dflip_flop) 611，係具有一第一 〇端 6111、一第一 CK 端 6113、一第一 Q 端 6112、一第一处 端6114、及一第一 R端6115,該第一 〇端6丨11係耦接外 201105029 加之一工作電麼vcc’該第一 CK端6113係耦接該時脈訊 號（Clock)，該第一 Qb端6114為浮接狀態，且該第—r 端6115係耦接該音頻放大器正輸出端〇ut以接收該輸出電 晶體組5輸出於音頻放大器正輸出端〇ut之該調變音頻吨 號，當調變音頻訊號持續維持高（低）準位超過兩個時脈 訊號週期之時，該第一 D型正反器611即依其特性反應輸 出一第一正反器訊號至下一級之一第二D型正反器M2; •及該第二0型正反器612,係具有一第二D端、一第 二 CK 端 6123、一第二 Q 端 6122、一第二讲端 6124、及 一第二R端6125，該第二！>端6121係耦接第一 d型正反 器6U之第一 Q端6112以接收該第一正反器訊號，該第二 CK端6123則耦接時脈訊號，該第二Q端6122係耦接於 該訊號放大單元2,該第二如端6124則為浮接狀態，該 第二R端6125係連接音頻放大器正輸出端〇以以接收調變 ®音頻訊號，當調變音頻訊號持續維持高（低）準位超過兩 個時脈訊號週期，此時，第二R端6125即接收到第一 Q 端6122所輸出之第一正反器訊號，該第二D型正反器612 即依其特性反應輸出-第一調整訊號，並回授至訊號放大 單元2’以調整該第二可變電阻RV2調變該放大音頻訊號 之增益，以消除音頻失真之現象…第二正反器組以， 係輕接音頻放大器負輸出端〇utb與訊號放大單元2,該第 二正反器組62可接收輪出電晶體組5輸出於音頻放大器負 201105029 輸出端Outb之調變音頻訊號’且，當調變音頻訊號持續維 持低（高）準位超過兩個時脈訊號週期之時，第二正反器A distortion suppression unit 6 is coupled to the positive output terminal 〇ut of the chirped amplifier, the negative output terminal of the audio amplifier, and the signal amplifying unit 2, and the distortion suppression unit 6 is measurable Whether the modulated audio signal outputted to the audio amplifier positive output terminal Out and the audio amplifier negative output terminal Outb has been distorted and suppressed is distorted. Referring to the circuit diagram of the eighth figure 'system suppression distortion unit, the suppression distortion unit 6 includes: A first flip-flop set (fliP-fl〇p set) 01 is coupled to the audio amplifier positive output terminal 〇ut and the signal amplifying unit 2, and the first-reactor group 61 can receive the output transistor group 5 output. The modulated audio signal is outputted to the positive output terminal Out of the audio amplifier, and the first flip-flop group 61 reacts according to its characteristic when the modulated audio signal continues to maintain the high (low) level for more than two clock signal periods. And outputting a first adjustment signal to the signal amplifying unit 2 to adjust the gain of the amplified audio signal. The first flip-flop group 61 includes: a first D-type flip-flop (Dflip_flop) 611 having a first frame a terminal 6111, a first CK terminal 6113, a first Q terminal 6112, a first terminal 6114, and a first R terminal 6115. The first terminal 6丨11 is coupled to the external 201105029 plus one working power. The first CK end 6113 is coupled to the clock signal (Clock), the first Qb end 6114 is in a floating state, and the first r end 6115 is coupled to the audio amplifier positive output terminal 〇ut to receive The output transistor group 5 outputs the modulated audio tonnage of the audio amplifier positive output terminal ,ut. When the modulated audio signal continues to maintain the high (low) level for more than two clock signal periods, the first D The type flip-flop 611 outputs a first flip-flop signal according to its characteristic to the second D-type flip-flop M2 of the next stage; and the second 0-type flip-flop 612 has a second D a second CK terminal 6123, a second Q terminal 6122, a second speaker 6124, and a second R terminal 6125, the second! The end portion 6121 is coupled to the first Q end 6112 of the first d-type flip-flop 6U to receive the first flip-flop signal, and the second CK end 6123 is coupled to the clock signal, the second Q end 6122 The signal is coupled to the signal amplifying unit 2, the second end 6124 is in a floating state, and the second R end 6125 is connected to the audio amplifier positive output port to receive the modulated audio signal, when the audio signal is modulated. Continuously maintaining the high (low) level for more than two clock signal periods. At this time, the second R terminal 6125 receives the first flip-flop signal outputted by the first Q terminal 6122, and the second D-type flip-flop 612 is responsive to its characteristic output-first adjustment signal, and is fed back to the signal amplifying unit 2' to adjust the second variable resistor RV2 to adjust the gain of the amplified audio signal to eliminate the phenomenon of audio distortion... The inverter group is lightly connected to the audio amplifier negative output terminal 〇utb and the signal amplifying unit 2, and the second flip-flop group 62 can receive the modulated audio output of the turn-out transistor group 5 output to the audio amplifier negative 201105029 output terminal Outb. Signal 'and, when the tone signal continues to maintain low (high) level more than two When the period of the clock signal, a second flip-flop
組02即依其特性反應而輸出—第二調整訊號至訊號放大 單元2，以調整放大音頻訊號之增益，第二正反器組62包 括：一第三D型正反器621，係具有一第三！）端6211、一 第三CK端6213、一第三Q端6212、一第三Qb端6214、 及一第二R端6215,該第三D端6211係耦接外加之該工 作電壓vcc，該第三CK端6213係耦接該時脈訊號 (Clock) ’該第三Qb端6214為浮接狀態，且該第三R端 6215係耦接該音頻放大器負輸出端〇utb以接收該輸出電 晶體組5輸出於音頻放大器負輸出端〇utb之該調變音頻訊 號，當調變音頻訊號持續維持低（高）準位超過兩個時脈 訊號週期之時，該第三D型正反器621即依其特性反應輸 出一第二正反器訊號至下一級之一第四D型正反器 及該第四D型正反器622,係具有一第四〇端622ι '一第 四CK端6223、一第四Q端6222、一第四叭端6224、及 一第四R端6225,該第四〇端6221係耗接第三d型正反 器⑶之第三Q端6212以接收該第三正反器訊號，該第四 CK端6225則耦接時脈訊號，該第四卩端6222係耦接於 該訊號放大單元2’該第四训端6224則為浮接狀態，該 第四汉端6225係連接音頻放大器負輸出端〇_以接收調 變音頻訊號’當調變音頻訊號持續維持低（高）準位超過 12 201105029 兩個時脈訊號週期，此時，第四R端6225即接收到第三q 端6212所輸出之第三正反器訊號，該第四D型正反器622 即依其特性反應輸出一第二調整訊號，並回授至訊號放大 單元’以調整該第一可變電阻RV1而調變該放大音頻訊號 之增益’以消除音頻失真之現象； 二個回授電阻RFB ’其中’一回授電阻RFB係耦接於 遠音頻放大器正輸出端〇ut與與該自我振盪調變單元3之 間’且’另一回授電阻rFB係耦接於該音頻放大器負輸出 端Outb與與自我振盪調變單元3之間，以協助回授訊號至 自我振盪調變單元3;及 一個該時脈單元7,該時脈單元7耦接該抑制失真單 元6以提供其該時脈訊號。 上述清楚地揭露了該改良之自我振盪音頻放大器丨之 較佳實施例所具備之電路結構與功能，另外，請參閱第七 A圖與第七B圖，係一種抑制自我振盪音頻放大器音頻失 真之方法流程圖，該抑制自我振盪音頻放大器音頻失真之 方法係包括以下步驟： 首先，執行步驟（701)，一訊號放大單元2接收及放 大一音頻訊號；接著，執行步驟（7〇2)，一自我振盪調變 單元3接收一放大音頻訊號以執行脈衝調變；然後，執行 步驟（ 703 )’ -閘級驅動單元4接收該自我振盪調變單元 3所輪出之一脈衝調變訊號以控制一輸出電晶體組5;接 13 201105029 著。執仃步驟（704 ) ’該輪出電晶體組5輸出一調變音頻 訊號至θ頻放大器正輪出端Out與一音頻放大器負輪出 端〇Utb;繼續執行步驟（705)，-第-正反器、组61列斷 輸出於該曰頻放大器正輸出#㈤之該調變音頻訊號是否 失真右疋調變音頻訊號失真，則執行步驟（7〇6 )，抑制 輸出於音頻放大器正輸出端〇ut之調變音頻訊號之失真， 並可接著執行步驟（7G9)，音頻放大器正輸㈣Out與音 頻放大器負輸出端〇utb輸出調變音頻訊號以驅動一揚聲 器120;若否’則執行步驟（7〇7)’ 一第二正反器組心 斷輸出於該音頻；^ f 龙敌大1§負輸出端〇utb之調變音頻訊號是 否失真’若是音頻放大器負輸出端outb之調變音頻訊號已 左失真’則執仃步，驟（708 )，抑制輸出於音頻放大器負輪 出端Outb之調變音頻訊號之失真，並於抑制調變音頻訊號 之失真之後’執行步驟（709 );若否，則表示音頻放大器 正輸出端Out與音頻放大器負輸出端〇灿所輸出之調變音 頻訊號皆未失真’則不需要抑制調變音頻訊號之失真，因 此，可直接執行步驟（)，音頻放大H正輸出端Out與 音頻放大負輸出$ 0utb輸出調變音頻訊號以驅動一揚 聲器120。 如上述說明之該抑制之自我振盪音頻放大器音頻失真 之方法’I青參閱第八圖’係步驟（7〇1)之詳細步驟流程圖， 其中’步驟（7〇1)更包括以下之詳細步驟： 14 201105029 貫先，執行步驟（7011)，一完全差動放大器21接收 該音頻訊號；接著’執行步驟（7012)，該完全差動放大器 21執行曰頻訊號之訊號放大；以及，執行步驟（Mu)， 完全差動放大器21輸出該放大音頻訊號，並接續執行下一 個步驟，即，步驟（702)。 另外，請參閱第九圖，係步驟（7〇2 )之詳細步驟流程 圖，其中’該㈣（702)更包括以下之詳細步驟：The group 02 outputs a second adjustment signal to the signal amplification unit 2 to adjust the gain of the amplified audio signal, and the second flip-flop group 62 includes a third D-type flip-flop 621 having a third! a terminal 6211, a third CK terminal 6213, a third Q terminal 6212, a third Qb terminal 6214, and a second R terminal 6215. The third D terminal 6211 is coupled to the applied operating voltage vcc. The third CK terminal 6213 is coupled to the clock signal (Clock). The third Qb terminal 6214 is in a floating state, and the third R terminal 6215 is coupled to the audio amplifier negative output terminal 〇utb to receive the output power. The crystal group 5 outputs the modulated audio signal of the negative output terminal 〇utb of the audio amplifier. When the modulated audio signal continues to maintain the low (high) level for more than two clock signal periods, the third D-type flip-flop 621, according to its characteristic reaction, outputs a second flip-flop signal to one of the fourth D-type flip-flops and the fourth D-type flip-flop 622, and has a fourth terminal 622 ι ' a fourth CK a terminal 6223, a fourth Q terminal 6222, a fourth terminal 6224, and a fourth R terminal 6225. The fourth terminal 6221 is connected to the third Q terminal 6212 of the third d-type flip-flop (3) for receiving. The fourth CK terminal 6225 is coupled to the clock signal, and the fourth terminal 6222 is coupled to the signal amplification unit 2 ′. The fourth training terminal 6224 is floating. State, the fourth Han end 6225 is connected to the audio amplifier negative output terminal 〇 _ to receive the modulated audio signal 'When the modulated audio signal continues to maintain the low (high) level exceeds 12 201105029 two clock signal cycles, at this time, The fourth R terminal 6225 receives the third flip-flop signal outputted by the third q-terminal 6212, and the fourth D-type flip-flop 622 outputs a second adjustment signal according to its characteristic response, and returns the signal to the signal amplification. The unit 'modulates the gain of the amplified audio signal by adjusting the first variable resistor RV1' to eliminate the phenomenon of audio distortion; two feedback resistors RFB 'where a feedback resistor RFB is coupled to the far audio amplifier The output terminal 〇ut and the self-oscillation modulation unit 3 are coupled to the audio amplifier negative output terminal Outb and the self-oscillation modulation unit 3 to assist feedback. The signal is supplied to the self-oscillation modulation unit 3; and the clock unit 7 is coupled to the suppression distortion unit 6 to provide the clock signal. The above clearly reveals the circuit structure and function of the preferred embodiment of the improved self-oscillating audio amplifier. In addition, please refer to the seventh and seventh panels, which are to suppress the audio distortion of the self-oscillating audio amplifier. Method flow chart, the method for suppressing self-oscillating audio amplifier audio distortion comprises the following steps: First, performing step (701), a signal amplifying unit 2 receives and amplifies an audio signal; and then performs step (7〇2), one The self-oscillation modulation unit 3 receives an amplified audio signal to perform pulse modulation; then, performs step (703)' - the gate drive unit 4 receives one of the pulse modulation signals rotated by the self-oscillation modulation unit 3 to control An output transistor group 5; connected 13 201105029. Performing step (704) 'The round out transistor group 5 outputs a modulated audio signal to the θ frequency amplifier positive wheel output Out and an audio amplifier negative wheel output terminal 〇Utb; continue to perform the step (705), - The flip-flop and the group 61 are disconnected and outputted to the chirped-amplifier positive output #(5), whether the modulated audio signal is distorted, and the right-hand modulation audio signal is distorted, then the step (7〇6) is executed to suppress the output to the audio amplifier. The 〇 ut modulates the distortion of the audio signal, and can then perform the step (7G9), the audio amplifier forwards (4) Out and the audio amplifier negative output 〇utb outputs the modulated audio signal to drive a speaker 120; if no, then the steps are performed (7〇7)' A second flip-flop group is outputted in the audio; ^ f Long enemy big 1 § negative output 〇utb modulation audio signal distortion? If the audio amplifier negative output outb modulation The audio signal has been left-distorted, then step (708), suppressing the distortion of the modulated audio signal outputted to the output end of the audio amplifier negative output Outb, and after suppressing the distortion of the modulated audio signal, 'execution step (709) If not, it means The audio amplifier positive output terminal Out and the audio amplifier negative output terminal output the modulated audio signal are not distorted', so there is no need to suppress the distortion of the modulated audio signal, therefore, the step () can be directly performed, the audio amplification H positive output The terminal Out and the audio amplification negative output $0utb output the modulated audio signal to drive a speaker 120. The method for suppressing the audio distortion of the self-oscillating audio amplifier as described above is described in detail in the eighth step of the step (7〇1), wherein the step (7〇1) further includes the following detailed steps. : 14 201105029 First, the execution step (7011), a fully differential amplifier 21 receives the audio signal; then 'execution step (7012), the fully differential amplifier 21 performs signal amplification of the chirp signal; and, the execution step ( Mu), the fully differential amplifier 21 outputs the amplified audio signal, and continues to perform the next step, step (702). In addition, please refer to the ninth figure, which is a detailed step flow diagram of the step (7〇2), wherein 'the (four) (702) further includes the following detailed steps:
首先，執行步驟（7〇2)詳細步驟之第一個步驟，步驟 7021 ) ’ 一積分器31同時接收該放大音頻訊號及一時脈 訊號；接著’執行步驟（7叫該積分器3丨依照該時脈 訊號之週期而產生自我振盪，以轉換放大音頻訊號為一三 角波訊號；然後’執行步驟（ 7023 )，積分器31輸出該三 角波訊號至-比較器32;接續步驟（7()23)之後執行步 驟（7024 )’該比較器32同時接收三角波訊號及一外加參 考電壓以執仃比較；以及，執行步驟（)，比較器η 輸出該脈衝調變訊號，並繼續步驟（7〇3)。 ° 凊再參閱第十圖，係步驟（7G5)之詳細步驟流程圖， 步驟（705 )更包括以下詳細步驟： 首先，執行步驟（705 1 )，—第一 D型正反器6ιι接收 輸出於該音頻放大器正輸㈣⑽之該調變音頻訊號；接 著執订步驟（7052 )，判斷是否調變音頻訊號維持高（低） 準位超過兩個時脈訊號週期’若是調變音頻訊號維持高 15 201105029 (低）準<立超過兩個時脈訊號週期，則執行步驟（7053 )， 該第，正反器611輸出一第一正反器訊號至一第二d 型正反器612之一第二0端6121’並繼續執行步驟(706 ); 若否’則執行該步驟（707 )。 另外，請再參閱第十一圖’係步驟（7〇6)之詳細步驟 流程圖，其中，舟勸（, 乂驟（706 )更包括以下之詳細步驟： 步驟（706)詳《田..First, the first step of the detailed step (7〇2) is performed, step 7021) 'an integrator 31 simultaneously receives the amplified audio signal and a clock signal; then 'execution step (7 is called the integrator 3丨 according to the The period of the clock signal generates self-oscillation to convert the amplified audio signal into a triangular wave signal; then 'execution step (7023), the integrator 31 outputs the triangular wave signal to the comparator 32; after the step (7 () 23) Step (7024) is performed to: the comparator 32 simultaneously receives the triangular wave signal and an applied reference voltage to perform the comparison; and, in the step (), the comparator η outputs the pulse modulation signal, and proceeds to the step (7〇3). ° 凊 Refer to the tenth figure, which is a detailed step flow chart of step (7G5). Step (705) further includes the following detailed steps: First, step (705 1 ) is performed, and the first D-type flip-flop 6 is received and outputted. The audio amplifier is positively inputting (4) (10) of the modulated audio signal; then, the binding step (7052) is performed to determine whether the modulated audio signal maintains a high (low) level exceeding two clock signal periods 'if the tone is adjusted The variable audio signal remains high 15 201105029 (low) accurate < more than two clock signal cycles, then step (7053) is performed, the first, flip-flop 611 outputs a first flip-flop signal to a second d-type The second 0 end 6121' of one of the flip-flops 612 continues to perform step (706); if not, the step (707) is performed. In addition, please refer to the eleventh figure for the details of the step (7〇6). Step flow chart, wherein, Zhou Yu (, step (706) further includes the following detailed steps: Step (706) details "Field..
坪細步驟之第一個步驟為，執行步驟 (7〇61)’該第二〇端61?1拔价姑银 ^ 121接收該第一正反器訊號；接著，The first step of the grading step is to perform the step (7〇61)', the second terminal 61?1 pulls the price of the yin silver ^121 to receive the first flip flop signal; then,
執行步驟（7062 )，玆笛-ΓΛ π丨丨τ rr W X第一 D型正反|§ 612輸出—第一調整 訊號至該訊號放大單亓^ Η 早兀2，以及，執仃步驟（7〇63 )，調整 該訊號放大單元2夕一访 ^ ^ 第一可變電阻RV2 ’以調變放大音 頻訊號之增益而消除音瓶生吉 '、㈢頻失真之現象，並繼續執行步驟 (709 )。 參閱第十—圖，係步驟（7〇7)之詳細步驟流圖， 其中，步驟㈤）更包括以下之詳細步驟： 首先，執行步驟（7〇71)，—第三D型正反器621接收 輸出於該音頻放大器負輸出端⑽之該調變音頻訊號；接 ¥ 7072 ；) ’判斷是否調變音頻訊號維持低（高）準位 超過兩個時脈訊號週期，若是音頻訊號維持低（高）準位 超過兩個時脈訊號週期，則執行步驟（ 7073 )，該第三D ^•正反器輸出一第二正反器訊號至一第四D型正反器之一 第四D端’並繼續執行步驟（ 708 );若否，則表示調變音 16 201105029 頻讯號無失真，故，直接執行步驟（7〇9)以透過音頻放大 器正輸出端與音頻放大器負輸出端輸出調變音頻訊號以驅 動該揚聲器。 凊再參閱第十三圖，係步驟（708 )之詳細步驟流程圖， 其中，該步驟（ 708 )更包括以下之詳細步驟： 步驟（ 708 )詳細步驟之第一個步驟為，步驟（7〇81)， 該第四D端接收該第一正反器訊號；接著，步驟⑺以)， 該第四D型正反器輸出_第二調整訊號至該訊號放大單 兀，以及，步驟（7083 )，調整該訊號放大單元之—第一可 變電阻’以調變放大音頻訊號之增益而消除音頻失真之現 象，並繼續執行步驟（7〇9)。 本發明之-種改良之自我振盡音頻放大器及抑制該自 我振盤音頻放大器音頻失真之方法，已藉由上述之較佳實Execution step (7062), zird-ΓΛ π丨丨τ rr WX first D-type positive and negative | § 612 output - first adjustment signal to the signal amplification unit 亓 ^ 兀 early 兀 2, and, the enforcement step (7 〇 63), adjusting the signal amplifying unit 2 to visit the first variable resistor RV2' to adjust the gain of the amplified audio signal to eliminate the phenomenon of the sound bottle Sonic ', (three) frequency distortion, and continue to perform the step (709 ). Referring to the tenth-figure, the detailed step flow diagram of the step (7〇7), wherein the step (5)) further comprises the following detailed steps: First, the step (7〇71) is performed, the third D-type flip-flop 621 Receiving the modulated audio signal outputted to the negative output terminal (10) of the audio amplifier; receiving ¥ 7072 ;) 'determining whether the modulated audio signal maintains a low (high) level for more than two clock signal periods, if the audio signal remains low ( If the high level exceeds two clock signal periods, the step (7073) is performed, and the third D ^• flip-flop outputs a second flip-flop signal to one of the fourth D-type flip-flops. End 'and continue to perform the step ( 708 ); if not, it means that the tuned sound 16 201105029 frequency signal has no distortion, so directly perform the step (7 〇 9) to pass through the audio amplifier positive output and the audio amplifier negative output output The audio signal is modulated to drive the speaker. Referring to FIG. 13 again, it is a detailed step flow chart of step (708), wherein the step (708) further comprises the following detailed steps: Step (708) The first step of the detailed step is, step (7) 81), the fourth D terminal receives the first flip-flop signal; then, in step (7), the fourth D-type flip-flop outputs a second adjustment signal to the signal amplification unit, and, step (7083 The first variable resistor of the signal amplifying unit is adjusted to cancel the gain of the amplified audio signal to eliminate the distortion of the audio, and the step (7〇9) is continued. The improved self-vibrating audio amplifier of the present invention and the method for suppressing the audio distortion of the self-vibrating audio amplifier have been improved by the above
•i而疋整地說明，因此，综合上述’相對於其它習知技 術，本發明係具有下列之優點： 1 ·本發明應用一抑隹丨|春吉苗- 早7G於一自我振盈音頻放大器， 係可監測該自我振盪音 頻放大器所輸出之音頻訊號是否 失真’若其所輸出之音 … 3頻訊號產生失真之現象’該抑制 失真早7L可立即有效地抑制音頻失真。 2‘另外，本發明之該抑制 方法，係利用正反器組 之音頻訊號是否失真， 自我振盪音頻放大器音頻失真之 以判斷輸出於音頻放大器輸出端 並藉由正反器組具有之二個串接 201105029 u 2止汉β，以抑制立 θ頻放大器所輪出之音頻訊號之失 真現象，以保持揚聲器高品質之輸出。 上述之詳細說明係針對本發明之—可行實施例之具體 說明’惟該實施例並非用以限制本發明之專利範圍，凡未 脫離本發明技藝精神所為之等效實施或變更，均應包含於 本案之專利範圍中。• i and 疋 地 , , 因此 因此 因此 因此 因此 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 综合 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对 相对It can monitor whether the audio signal output by the self-oscillating audio amplifier is distorted 'if the sound it outputs... 3 frequency signal produces distortion phenomenon' The suppression distortion is 7L early and can effectively suppress the audio distortion immediately. 2' In addition, the suppression method of the present invention utilizes whether the audio signal of the flip-flop group is distorted, and self-oscillates the audio distortion of the audio amplifier to determine the output of the audio amplifier output and the two strings of the flip-flop group. Connect 201105029 u 2 stop β, to suppress the distortion of the audio signal rotated by the vertical θ frequency amplifier to maintain the speaker's high quality output. The detailed description of the present invention is intended to be illustrative of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.
18 201105029 【圖式簡 第一圖 第二圖 第三圖 第四圖 第五圖 第六圖 第七A圖 • 第八圖 第九圖 第十圖 第十一圖 第十二圖 第十三圖 單說明】 係習知技術之可自我振盪之音訊 放大之電路結構圖， 係習知技術之可自我振盪之音訊 放大器之子音訊放大器之電路結 構圖； 係一種改良之自我振盪音頻放大 器之電路結構圖； 係訊號放大單元之電路結構圖； 係自我振盪調變單元之電路結構 圖， 係抑制失真單元之電路結構圖； 與第七B圖 係一種抑制自我振盪音頻放大器 音頻失真之方法流程圖； 係步驟（701 )之詳細步驟流程圖； 係步驟（702 )之詳細步驟流程圖； 係步驟（705 )之詳細步驟流程圖； 係步驟（706 )之詳細步驟流程圖； 係步驟（707 )之詳細步驟流程圖； 及 係步驟（708 )之詳細步驟流程圖。 201105029 【主要元件符號說明】 100 104 106 108 改良之自我振盪音頻放大器 自我振盪之音訊放大器 音頻訊號 子音訊放大器 前置驅動器 110 電晶體組18 201105029 [Picture first diagram second diagram third diagram fourth diagram fifth diagram sixth diagram seventh diagram A• eighth diagram ninth diagram tenth diagram eleventh diagram twelfth diagram thirteenth diagram Single circuit diagram The circuit structure diagram of the self-oscillating audio amplification of the conventional technology, which is a circuit structure diagram of a sub-audio amplifier of a self-oscillating audio amplifier of the prior art; a circuit structure diagram of an improved self-oscillating audio amplifier The circuit structure diagram of the signal amplification unit; the circuit structure diagram of the self-oscillation modulation unit, the circuit structure diagram of the suppression distortion unit; and the seventh B diagram are a flow chart of the method for suppressing the audio distortion of the self-oscillating audio amplifier; Detailed step flow chart of step (701); detailed step flow chart of step (702); detailed step flow chart of step (705); detailed step flow chart of step (706); detail of step (707) Step flow chart; and a detailed step flow chart of step (708). 201105029 [Explanation of main component symbols] 100 104 106 108 Improved self-oscillating audio amplifier Self-oscillating audio amplifier Audio signal Sub-audio amplifier Front-mounted driver 110 Crystal group
112 114 116 118 120 濾波器電感 濾波器電容 時脈輸入源 時脈選擇開關 揚聲器 122、132 比較器 124 、 126 、 130 鲁128 134 140 、 142 144 2 電阻 時脈切換開關 振盪電容 電晶體 電壓源 訊號放大單元（signal amplifier unit ) 完全差動放大器 (fully differential amplifier) 自我振盪調變單元 20 21 201105029 31 311 3111 3112 3113 32 # 321 322 323 4 5 6 ♦ 61 611 6111 6112 6113 6114 6115 612 (self-oscillation modulation unit) 積分器（integrator ) 運算放大器（OPA) 運算放大器負輸入端 運算放大器正輸入端 運算放大器輸出端 比較器（comparator) 比較器正輸入端 比較器負輸入端 比較器輸出端 閘極驅動單元（gate drive unit ) 輸出電晶體組（output stage transistor) 抑制失真單元 (distortion restraint unit ) 第一正反器組（flip-flop set ) 第一 D型正反器（D flip-flop ) 第一 D端 第一 Q端 第一 CK端 第一 Qb端 第一 R端 第二D型正反器 21 201105029112 114 116 118 120 Filter Inductor Filter Capacitor Clock Input Source Clock Selector Switch Speakers 122, 132 Comparators 124, 126, 130 Lu 128 134 140, 142 144 2 Resistance Clock Switching Switching Oscillator Capacitor Voltage Source Signal Signal amplifier unit fully differential amplifier self-oscillation modulation unit 20 21 201105029 31 311 3111 3112 3113 32 # 321 322 323 4 5 6 ♦ 61 611 6111 6112 6113 6114 6115 612 (self-oscillation Modulator unit (integrator) operational amplifier (OPA) operational amplifier negative input operational amplifier positive input operational amplifier output comparator (comparator) comparator positive input comparator negative input comparator output (gate drive unit) output stage transistor suppression restraint unit first flip-flop set first d-type flip-flop (D flip-flop) first D End first Q end first CK end first Qb end first R end second D type flip-flop 21 20110502 9
6121 第 二 D端 6122 第 二 Q端 6123 第 二 CK端 6124 第 二 Qb端 6125 第 二 R端 62 第 二 正反器組 621 第 二 D型正反器 6211 第 二 D端 6212 第 二 Q端 6213 第 —— CK端 6214 第 二 Qb端 6215 第 二 R端 622 第 四 D型正反器 6221 第 四 D端 6222 第 四 Q端 6223 第 四 CK端 6224 第 四 Qb端 6225 第 四 R端 7 時脈單元（clock unit) 701〜 709 方法步驟 7011， -7013 方法步驟 7021 〜7025 方法步驟 22 201105029 705 1 〜7053 方法步驟 7061 〜7063 方法步驟 7071 〜7073 方法步驟 7081 〜7083 方法步驟 Cint 積分器電容（integrator capacitor) Out 音頻放大器正輸出端 Outb 音頻放大器負輸出端 # RV1 第一可變電阻（variable resistor) RV2 第一可變電阻（variable resistor ) RFB 回授電阻（feedback resistor) Rint 積分器電阻（integrator resistor) QN N型功率場效電晶體 (N type power field transistor) QP • P型功率場效電晶體 (P type power field transistor) Vin+ 差動放大器正輸入端 Vin- 差動放大器負輸入端 Vout+ 差動放大器正輸出端 Vout- 差動放大器負輸出端 VREF 外加參考電壓 VCC 外加工作電壓 t s ] 236121 second D terminal 6122 second Q terminal 6123 second CK terminal 6124 second Qb terminal 6125 second R terminal 62 second flip flop group 621 second D type flip flop 6211 second D terminal 6212 second Q terminal 6213 - CK end 6214 second Qb end 6215 second R end 622 fourth D type flip-flop 6221 fourth D end 6222 fourth Q end 6223 fourth CK end 6224 fourth Qb end 6225 fourth R end 7 Clock unit 701~709 Method steps 7011, -7013 Method steps 7021~7025 Method step 22 201105029 705 1~7053 Method steps 7061~7063 Method steps 7071~7073 Method steps7081~7083 Method step Cint Integrator capacitance (integrator capacitor) Out Audio amplifier positive output Outb Audio amplifier negative output # RV1 First variable resistor (RV2) First variable resistor (variable resistor) RFB Feedback resistor Rint Integrator resistor ( Integrator resistor) QN N-type power field transistor QP • P-type power field effect Crystal (P type power field transistor) Vin + Vin- differential amplifier positive input terminal of the differential amplifier negative input terminal of the positive output Vout + of the differential amplifier of the differential amplifier end of the negative output Vout- terminal VREF reference voltage VCC applied to the operating voltage applied t s] 23
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| TWI334268B (en) * | 2006-09-11 | 2010-12-01 | Elite Semiconductor Esmt | Class-d audio amplifier with half-swing pulse-width-modulation |
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| CN103166574A (en) * | 2011-12-15 | 2013-06-19 | 普诚科技股份有限公司 | Amplifying circuit capable of improving audio signal surge |
| TWI460989B (en) * | 2011-12-15 | 2014-11-11 | Princeton Technology Corp | Amplifying circuit capable of improving spikes of an audio signal |
| US9065398B2 (en) | 2011-12-15 | 2015-06-23 | Princeton Technology Corporation | Amplifying circuit capable of suppressing spikes of an audio signal |
| CN103166574B (en) * | 2011-12-15 | 2016-07-06 | 普诚科技股份有限公司 | Amplifying circuit capable of improving audio signal surge |
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