TWI480717B - Output voltage is lower than the energy gap reference source and can provide a variety of different low-output voltage level regulator circuit - Google Patents
Output voltage is lower than the energy gap reference source and can provide a variety of different low-output voltage level regulator circuit Download PDFInfo
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本發明係關於一穩壓電路設計，尤指一種輸出電壓低於能隙電壓參考源，並且並聯多個穩壓分支電路來同時提供多種不同輸出電壓準位的穩壓電路。The invention relates to a voltage stabilizing circuit design, in particular to a voltage stabilizing circuit with an output voltage lower than a bandgap voltage reference source and paralleling a plurality of voltage stabilizing branch circuits to simultaneously provide a plurality of different output voltage levels.
隨著科技的進步，各種消費性電子產品的發展，如數位相機、智慧型手機、筆記型電腦、個人數位助理(personal digital assistant,PDA)、或多媒體娛樂裝置等已經成為人們所不可獲缺的一項重要工具。在通訊市場逐漸成熟發展之際，相關IC的應用更是不斷成長，而各種消費性電子產品多由電池提供能量。因此，供應電源的電池之使用時間的長短更顯得額外重要，而如何提高電池的效率並且維持其一定的穩定度是一個相當有挑戰的課題。With the advancement of technology, the development of various consumer electronic products, such as digital cameras, smart phones, notebook computers, personal digital assistants (PDAs), or multimedia entertainment devices, has become indispensable. An important tool. As the communications market matures, the application of related ICs continues to grow, and various consumer electronic products are mostly powered by batteries. Therefore, the length of use of the battery that supplies the power supply is even more important, and how to improve the efficiency of the battery and maintain its stability is a very challenging subject.
各種消費性電子產品的使用，其在電力供給及輸出之使用上，通常為求實際機具或輸出品質的穩定，對於實際供電品質都會以穩定的供壓為前提，期能使通電使用的各種消費性電子產品發揮高效率的輸出品質，其更重要的是可維持各種消費性電子產品的安全使用。The use of various consumer electronic products, in the use of power supply and output, usually for the stability of the actual machine or output quality, the actual supply quality will be based on a stable supply pressure, the period of energy consumption can be used for various consumption Sexual electronic products provide high-efficiency output quality, and more importantly, they can maintain the safe use of various consumer electronic products.
而幾乎所有消費性電子產品都具有經調節的電源，調節的目的是為了迎合電子設備的需求。其中，穩壓器就是這種電源的重要組成部分，它的作用是使輸出電壓和/或電流保持在期 望的範圍內，使輸入的電流及電壓做一較平穩的控制。另外，在各種消費性電子產品低功耗的要求下，愈來愈多的電子設備應用，需要有電源同時可以提供多種不同低電壓準位。因此，一種穩壓器的設計，可以滿足同時提供多種不同輸出電壓準位的需求，亦是非常的重要。Almost all consumer electronics products have regulated power supplies that are tuned to meet the needs of electronic devices. Among them, the regulator is an important part of this power supply, its role is to keep the output voltage and / or current in the period Within the range of hope, the input current and voltage are made a smoother control. In addition, in the low power consumption requirements of various consumer electronic products, more and more electronic equipment applications require a power supply and can provide a variety of different low voltage levels. Therefore, a regulator design is also very important to meet the needs of providing a variety of different output voltage levels.
請參閱第1圖，係顯示習知穩壓電路之電路架構示意圖。如圖所示，一般傳統的穩壓器設計，皆需要有一能隙電壓參考源(Bandgap voltage reference)Vs做為內部參考電壓，能隙電壓參考源Vs能提供一不隨溫度與電源變化的參考電壓準位。其中，能隙電壓參考源Vs大約為1.25伏特。Please refer to FIG. 1 , which is a schematic diagram showing the circuit structure of a conventional voltage regulator circuit. As shown in the figure, the conventional regulator design requires a Bandgap voltage reference Vs as the internal reference voltage. The bandgap voltage reference source Vs can provide a reference that does not vary with temperature and power supply. Voltage level. Wherein, the bandgap voltage reference source Vs is approximately 1.25 volts.
習知穩壓電路100係包括有一驅動元件11、一第一放大器12及一輸出分壓電路13。The conventional voltage stabilizing circuit 100 includes a driving element 11, a first amplifier 12 and an output voltage dividing circuit 13.
驅動元件11具有一閘極端111、一電源端節點112及一輸出電壓端113，其中電源端節點112係連接至一電源電壓Vin，輸出電壓端113係可輸出一輸出電壓Vout。而第一放大器12具有一能隙電壓連接端121(即放大器正輸入端)、一回授輸入端122(即放大器負輸入端)及一放大器輸出端123，能隙電壓連接端121係連接至能隙電壓參考源Vs，而放大器輸出端123係連接至驅動元件11之閘極端111。The driving component 11 has a gate terminal 111, a power terminal node 112 and an output voltage terminal 113. The power terminal node 112 is connected to a power voltage Vin, and the output voltage terminal 113 outputs an output voltage Vout. The first amplifier 12 has a bandgap voltage connection terminal 121 (ie, the amplifier positive input terminal), a feedback input terminal 122 (ie, the amplifier negative input terminal), and an amplifier output terminal 123. The bandgap voltage connection terminal 121 is connected to The bandgap voltage is referenced to source Vs and amplifier output 123 is coupled to gate terminal 111 of drive element 11.
輸出分壓電路13連接於驅動元件11之輸出電壓端113與一接地電位G之間，輸出分壓電路13包括有一第一輸出分壓電阻131及一第二輸出分壓電阻132。輸出分壓電路13具有一回授節點N1，位於第一輸出分壓電阻131及第二輸出分壓電阻132之連接點，回授節點N1係連接至第一放大器12之回授輸入端122。The output voltage dividing circuit 13 is connected between the output voltage terminal 113 of the driving component 11 and a ground potential G. The output voltage dividing circuit 13 includes a first output voltage dividing resistor 131 and a second output voltage dividing resistor 132. The output voltage dividing circuit 13 has a feedback node N1 at a connection point of the first output voltage dividing resistor 131 and the second output voltage dividing resistor 132. The feedback node N1 is connected to the feedback input terminal 122 of the first amplifier 12. .
經由習知之穩壓電路100之電路特性，可得知回授 節點N1之電壓準位等於能隙電壓參考源Vs的電壓準位(VN1 =Vs)，而驅動元件11之輸出電壓Vout之電壓準位係大於能隙電壓參考源Vs的電壓準位(Vout>Vs)。Through the circuit characteristics of the conventional voltage stabilizing circuit 100, it can be known that the voltage level of the feedback node N1 is equal to the voltage level of the bandgap voltage reference source Vs (V N1 = Vs), and the voltage of the output voltage Vout of the driving element 11 The level is greater than the voltage level of the bandgap voltage reference source Vs (Vout>Vs).
但隨著製程技術的不斷演進，穩壓器所需要提供的輸出電壓準位越來越低，而依據輸出電壓Vout之電壓準位係高於能隙電壓參考源Vs的電壓準位之電路特性，若需要提供低於的輸出電壓Vout，則需降低能隙電壓參考源Vs之電壓準位。However, with the continuous evolution of the process technology, the output voltage level required by the regulator is getting lower and lower, and the voltage level according to the output voltage Vout is higher than the voltage level of the gap voltage reference source Vs. If it is necessary to provide a lower output voltage Vout, the voltage level of the gap voltage reference source Vs needs to be lowered.
然而，一般傳統的穩壓器設計，若因需要較低的輸出電壓Vout而降低能隙電壓參考源Vs之電壓準位，容易發生輸出電壓不穩定之情形，進而影響消費性電子產品的使用。再則，為滿足單一穩壓器同時可以提供多種不同輸出電壓準位的電子設備應用需求趨勢，穩壓器多準位輸出設計也是非常重要的。因此，如何設計一個能同時提供多種不同較低且穩定的輸出電壓Vout之穩壓器是一個重要的課題。However, in the conventional voltage regulator design, if the voltage level of the gap voltage reference source Vs is lowered due to the need of a lower output voltage Vout, the output voltage is unstable, which may affect the use of consumer electronic products. Furthermore, in order to meet the trend of demand for electronic devices with a single regulator and a variety of different output voltage levels, the multi-level output design of the regulator is also very important. Therefore, how to design a voltage regulator that can provide a variety of different low and stable output voltages Vout is an important issue.
緣此，鑑於傳統穩壓器無法提供一較低且穩定之輸出電壓之缺失，而且還要滿足單一穩壓器同時可以提供多種不同低輸出電壓準位的電子設備應用需求，本發明之主要目的即是提供一種輸出電壓低於能隙電壓參考源的穩壓電路，且此穩壓電路可同時提供多種不同低輸出電壓準位。Therefore, the main purpose of the present invention is in view of the fact that conventional voltage regulators cannot provide a low and stable output voltage deficiency, and also meet the needs of a single voltage regulator that can provide a variety of different low output voltage levels for electronic equipment applications. That is, a voltage stabilizing circuit with an output voltage lower than the reference voltage reference source is provided, and the voltage stabilizing circuit can simultaneously provide a plurality of different low output voltage levels.
本發明為解決習知技術之問題所採用之技術手段係在習知的穩壓器中增加一能隙電壓調整電路，藉由能隙電壓調整電路之電路特性，使本發明之輸出電壓低於能隙電壓參考源的穩壓電路能提供一可低於能隙電壓參考源之電壓準位的輸出電壓。並且設計使用一多種電壓準位輸出穩壓電路。The technical means adopted by the present invention to solve the problems of the prior art is to add a bandgap voltage adjusting circuit to the conventional voltage regulator, and the output voltage of the present invention is lower than the circuit characteristic of the bandgap voltage adjusting circuit. The voltage regulator circuit of the bandgap voltage reference source can provide an output voltage that can be lower than the voltage level of the bandgap voltage reference source. And the design uses a variety of voltage level output regulator circuits.
本發明中的能隙電壓調整電路係由一電源電壓經由一偏壓電流源提供所需之工作電流至能隙電壓調整電路，而能隙電壓調整電路係包括有一源極隨耦電晶體、一負載電晶體、一第二放大器及一分壓電路。其中，在能隙電壓調整電路中具有一能隙電壓參考源輸入端、一偏壓電流端節點及一分壓輸出節點。The bandgap voltage adjusting circuit of the present invention provides a required operating current to the bandgap voltage adjusting circuit by a power supply voltage via a bias current source, and the bandgap voltage adjusting circuit includes a source follower transistor, A load transistor, a second amplifier, and a voltage dividing circuit. Wherein, the bandgap voltage adjusting circuit has a bandgap voltage reference source input terminal, a bias current terminal node and a voltage dividing output node.
負載電晶體之汲極端係連接至源極隨耦電晶體之汲極端，源極端係連至接地電位，而閘極端係連接至電源電壓。其中，源極隨耦電晶體之源極端係連接至偏壓電流端節點。The 汲 extreme of the load transistor is connected to the 汲 terminal of the source follower transistor, the source terminal is connected to the ground potential, and the gate terminal is connected to the supply voltage. The source extremum of the source follower transistor is connected to the bias current end node.
第二放大器之放大器負輸入端係連接至偏壓電流端節點，第二放大器之放大器正輸入端係連接至能隙電壓參考源，而第二放大器之放大器輸出端係連接至源極隨耦電晶體之閘極端。分壓電路之第一分壓電阻與第二分壓電阻之連接點係作為分壓輸出節點，第一分壓電阻之另一端係連接至偏壓電流端節點，而第二分壓電阻之另一端係連接至接地電位。The negative input of the amplifier of the second amplifier is connected to the bias current terminal, the positive input of the amplifier of the second amplifier is connected to the bandgap voltage reference source, and the amplifier output of the second amplifier is connected to the source follower The gate of the crystal is extreme. The connection point of the first voltage dividing resistor and the second voltage dividing resistor of the voltage dividing circuit is a voltage dividing output node, and the other end of the first voltage dividing resistor is connected to the bias current end node, and the second voltage dividing resistor is The other end is connected to the ground potential.
藉由能隙電壓調整電路之電路特性，可使得偏壓電流端節點之電壓準位等於能隙電壓參考源的電壓準位(VN2 =Vs)，而分壓輸出節點之電壓準位則低於能隙電壓參考源的電壓準位(VN3 <Vs)，故驅動元件之輸出電壓端之電壓準位低於能隙電壓調整電路之偏壓電流端節點的電壓準位(Vout<VN2 )。By the circuit characteristic of the bandgap voltage adjusting circuit, the voltage level of the bias current terminal node is equal to the voltage level of the bandgap voltage reference source (V N2 = Vs), and the voltage level of the voltage dividing output node is low. The voltage level of the bandgap voltage reference source (V N3 <Vs), so the voltage level of the output voltage terminal of the driving component is lower than the voltage level of the bias current terminal of the bandgap voltage adjusting circuit (Vout<V N2 ).
本發明的較佳實施例中，多種電壓準位輸出穩壓電路係由數個穩壓分支電路並聯所組成。穩壓分支電路各別包括有一驅動元件、一第一放大器及一輸出分壓電路。驅動元件之電源端節點係連接至一電源電壓，另一端係作為輸出電壓端。而第一放大器之放大器正輸入端係連接至能隙電壓調整電路之分壓輸出節點，而第一放大器之放大器輸出端係連接至驅動元件之閘極 端。藉由其中各別穩壓分支電路中輸出分壓電路電阻值的不同組合，來產生多種不同的輸出電壓準位。In a preferred embodiment of the present invention, a plurality of voltage level output voltage stabilizing circuits are composed of a plurality of voltage stabilizing branch circuits connected in parallel. The voltage stabilizing branch circuits each include a driving component, a first amplifier, and an output voltage dividing circuit. The power supply node of the drive component is connected to a power supply voltage and the other end is used as an output voltage terminal. The positive input terminal of the first amplifier is connected to the voltage dividing output node of the bandgap voltage adjusting circuit, and the amplifier output of the first amplifier is connected to the gate of the driving component. end. A variety of different output voltage levels are generated by different combinations of the output voltage divider circuit resistor values in the respective voltage regulator branch circuits.
經由本發明所採用之技術手段，使輸出電壓低於能隙電壓參考源的穩壓電路提供一可低於能隙電壓參考源之電壓準位的輸出電壓，供需要較低的輸出電壓各種消費性電子產品使用，取代傳統無法提供較低的輸出電壓之穩壓器。且藉由本發明中的多種電壓準位輸出穩壓電路可同時提供多種不同輸出電壓準位。Through the technical means adopted by the present invention, the voltage stabilizing circuit whose output voltage is lower than the energy gap voltage reference source provides an output voltage lower than the voltage level of the reference voltage reference source for various consumptions requiring a lower output voltage. The use of sex electronics replaces the traditional regulators that do not provide a lower output voltage. Moreover, a plurality of different output voltage levels can be simultaneously provided by the plurality of voltage level output voltage stabilizing circuits in the present invention.
本發明所採用的具體技術，將藉由以下之實施例及附呈圖式作進一步之說明。The specific techniques used in the present invention will be further illustrated by the following examples and the accompanying drawings.
100‧‧‧習知穩壓電路100‧‧‧Study voltage regulator circuit
1‧‧‧多種電壓準位輸出穩壓電路1‧‧‧Multiple voltage level output voltage regulator circuits
1A~1M‧‧‧穩壓分支電路1A~1M‧‧‧Variable branch circuit
11‧‧‧驅動元件11‧‧‧Drive components
11A~11M‧‧‧驅動元件11A~11M‧‧‧ drive components
111‧‧‧閘極端111‧‧‧ gate extreme
111A~111M‧‧‧閘極端111A~111M‧‧‧ gate extreme
112‧‧‧電源端節點112‧‧‧Power end node
112A~112M‧‧‧電源端節點112A~112M‧‧‧ power end node
113‧‧‧輸出電壓端113‧‧‧Output voltage terminal
113A~113M‧‧‧輸出電壓端113A~113M‧‧‧ output voltage terminal
12‧‧‧第一放大器12‧‧‧First amplifier
12A~12M‧‧‧第一放大器12A~12M‧‧‧First amplifier
121‧‧‧能隙電壓連接端121‧‧‧gap voltage connection
121A~121M‧‧‧能隙電壓連接端121A~121M‧‧‧gap voltage connection
122‧‧‧回授輸入端122‧‧‧Return input
122A~122M‧‧‧回授輸入端122A~122M‧‧‧ feedback input
123‧‧‧放大器輸出端123‧‧‧Amplifier output
123A~123M‧‧‧放大器輸出端123A~123M‧‧‧Amplifier output
13‧‧‧輸出分壓電路13‧‧‧Output voltage divider circuit
13A~13M‧‧‧輸出分壓電路13A~13M‧‧‧ Output voltage dividing circuit
131‧‧‧第一輸出分壓電阻131‧‧‧First output voltage divider resistor
131A~131M‧‧‧第一輸出分壓電阻131A~131M‧‧‧First output voltage divider resistor
132‧‧‧第二輸出分壓電阻132‧‧‧Second output voltage divider resistor
132A~132M‧‧‧第二輸出分壓電阻132A~132M‧‧‧Second output voltage dividing resistor
2‧‧‧能隙電壓調整電路2‧‧‧gap voltage adjustment circuit
21‧‧‧源極隨耦電晶體21‧‧‧Source pole-coupled transistor
211‧‧‧閘極端211‧‧ ‧ gate extreme
212‧‧‧源極端212‧‧‧ source extreme
213‧‧‧汲極端213‧‧‧汲 Extreme
22‧‧‧負載電晶體22‧‧‧Loading transistor
221‧‧‧閘極端221‧‧ ‧ extreme
222‧‧‧汲極端222‧‧‧汲 extreme
223‧‧‧源極端223‧‧‧ source extreme
23‧‧‧第二放大器23‧‧‧Second amplifier
231‧‧‧偏壓電流連接端231‧‧‧Butable current connection
232‧‧‧能隙電壓參考源輸入端232‧‧‧gap voltage reference source input
233‧‧‧輸出端233‧‧‧ Output
24‧‧‧分壓電路24‧‧‧voltage circuit
241‧‧‧第一分壓電阻241‧‧‧First voltage divider resistor
242‧‧‧第二分壓電阻242‧‧‧Second voltage divider resistor
G‧‧‧接地電位G‧‧‧ Ground potential
N1‧‧‧回授節點N1‧‧‧Return node
N1A~N1M‧‧‧回授節點N1A~N1M‧‧‧Responsive node
N2‧‧‧偏壓電流端節點N2‧‧‧ bias current end node
N3‧‧‧分壓輸出節點N3‧‧‧voltage output node
Vin‧‧‧電源電壓Vin‧‧‧Power supply voltage
Vout‧‧‧輸出電壓Vout‧‧‧ output voltage
Vout_A~Vout_M‧‧‧輸出電壓Vout_A~Vout_M‧‧‧Output voltage
Vs‧‧‧能隙電壓參考源Vs‧‧‧gap voltage reference source
I‧‧‧偏壓電流源I‧‧‧ bias current source
第1圖係顯示習知穩壓電路之電路架構示意圖。Figure 1 is a schematic diagram showing the circuit architecture of a conventional voltage regulator circuit.
第2圖係顯示本發明輸出電壓低於能隙電壓參考源且可同時提供多種不同低輸出電壓準位的穩壓電路之電路方塊圖。Figure 2 is a block diagram showing the voltage regulator circuit of the present invention having an output voltage lower than the bandgap voltage reference source and capable of simultaneously providing a plurality of different low output voltage levels.
第3圖係顯示本發明輸出電壓低於能隙電壓參考源且可同時提供多種不同低輸出電壓準位的穩壓電路之較佳實施例電路圖。Figure 3 is a circuit diagram showing a preferred embodiment of the voltage stabilizing circuit of the present invention having an output voltage lower than the bandgap voltage reference source and capable of simultaneously providing a plurality of different low output voltage levels.
請參閱第2圖及第3圖，係分別顯示本發明輸出電壓低於能隙電壓參考源且可同時提供多種不同低輸出電壓準位的穩壓電路之電路方塊圖及較佳實施例電路圖。第2圖所示，本發明之能隙電壓調整電路2係連接在多種電壓準位輸出穩壓電路1與能隙電壓參考源Vs之間。能隙電壓參考源Vs提供一不隨溫度與電源變化的穩定參考電壓準位至能隙電壓調整電路2。Please refer to FIG. 2 and FIG. 3 , which are respectively a circuit block diagram and a circuit diagram of a preferred embodiment of the voltage stabilizing circuit of the present invention whose output voltage is lower than the bandgap voltage reference source and can simultaneously provide a plurality of different low output voltage levels. As shown in Fig. 2, the bandgap voltage adjusting circuit 2 of the present invention is connected between a plurality of voltage level output voltage stabilizing circuits 1 and a bandgap voltage reference source Vs. The bandgap voltage reference source Vs provides a stable reference voltage level that does not vary with temperature and power supply to the bandgap voltage adjustment circuit 2.
多種電壓準位輸出穩壓電路1由數個穩壓分支電路1A~1M並聯所組成。穩壓分支電路1A~1M分別具有一電源端節點112A~112M、一輸出電壓端113A~113M、一能隙電壓連接端121A~121M、一回授輸入端122A~122M、一回授節點N1A~N1M、一輸出電壓Vout_A~Vout_M、一接地電位G，其中該電源端節點112A~112M係連接至一電源電壓Vin。A plurality of voltage level output voltage stabilizing circuits 1 are composed of a plurality of voltage stabilizing branch circuits 1A to 1M in parallel. The voltage limiting branch circuits 1A~1M respectively have a power terminal node 112A~112M, an output voltage terminal 113A~113M, a bandgap voltage connection terminal 121A~121M, a feedback input terminal 122A~122M, and a feedback node N1A~ N1M, an output voltage Vout_A~Vout_M, a ground potential G, wherein the power terminal nodes 112A-112M are connected to a power supply voltage Vin.
穩壓分支電路1A~1M可採用習知的穩壓電路結構。例如在圖式中所示，各個穩壓分支電路1A~1M中包括有一驅動元件11A~11M、一第一放大器12A~12M及一輸出分壓電路13A~13M。The voltage stabilizing branch circuits 1A to 1M can adopt a conventional voltage stabilizing circuit structure. For example, as shown in the drawing, each of the voltage stabilizing branch circuits 1A to 1M includes a driving element 11A to 11M, a first amplifier 12A to 12M, and an output voltage dividing circuit 13A to 13M.
驅動元件11A~11M具有一閘極端111A~111M、一電源端節點112A~112M及一輸出電壓端113A~113M，其中電源端節點112A~112M係連接至一電源電壓Vin，輸出電壓端113A~113M係可分別輸出一輸出電壓Vout_A~Vout_M。而第一放大器12A~12M具有一能隙電壓連接端121A~121M、一回授輸入端122A~122M及一放大器輸出端123A~123M，能隙電壓連接端121A~121M係連接至能隙電壓調整電路2之分壓輸出節點N3，而放大器輸出端123A~123M係連接至驅動元件11A~11M之閘極端111A~111M。The driving components 11A-11M have a gate terminals 111A-111M, a power terminal node 112A-112M, and an output voltage terminal 113A-113M. The power terminal nodes 112A-112M are connected to a power supply voltage Vin, and the output voltage terminals 113A-113M. An output voltage Vout_A~Vout_M can be respectively output. The first amplifiers 12A~12M have a bandgap voltage connection end 121A~121M, a feedback input end 122A~122M and an amplifier output end 123A~123M, and the bandgap voltage connection end 121A~121M is connected to the bandgap voltage adjustment. The circuit 2 is divided by the output node N3, and the amplifier outputs 123A to 123M are connected to the gate terminals 111A to 111M of the driving elements 11A to 11M.
輸出分壓電路13A~13M連接於驅動元件11A~11M之輸出電壓端113A~113M與一接地電位G之間，輸出分壓電路13A~13M包括有一第一輸出分壓電阻131A~131M及一第二輸出分壓電阻132A~132M。輸出分壓電路13A~13M具有一回授節點N1A~N1M，位於第一輸出分壓電阻131A~131M及第二輸出分壓電阻132A~132M之連接點，回授節點N1A~N1M係連接至第一放 大器12A~12M之回授輸入端122A~122M。The output voltage dividing circuits 13A to 13M are connected between the output voltage terminals 113A to 113M of the driving elements 11A to 11M and a ground potential G. The output voltage dividing circuits 13A to 13M include a first output voltage dividing resistor 131A to 131M and A second output voltage dividing resistor 132A~132M. The output voltage dividing circuits 13A-13M have a feedback node N1A~N1M, which are located at the connection points of the first output voltage dividing resistors 131A-131M and the second output voltage dividing resistors 132A-132M, and the feedback nodes N1A~N1M are connected to First release The feedback terminals 122A~122M of the large 12A~12M are returned.
能隙電壓調整電路2包括有一偏壓電流端節點N2、一分壓輸出節點N3、一能隙電壓參考源輸入端232，其中該能隙電壓參考源輸入端232係連接於能隙電壓參考源Vs，該偏壓電流端節點N2之電壓準位等於該能隙電壓參考源Vs的電壓準位，該分壓輸出節點N3之電壓準位低於該能隙電壓參考源Vs的電壓準位，且該穩壓分支電路1A~1M之輸出電壓端113A~113M所輸出之輸出電壓Vout_A~Vout_M之電壓準位低於偏壓電流端節點N2的電壓準位，亦即該多種電壓準位輸出穩壓電路1之輸出電壓端113A~113M所輸出的輸出電壓Vout_A~Vout_M之電壓準位低於該能隙電壓參考源Vs的電壓準位。The bandgap voltage adjustment circuit 2 includes a bias current terminal node N2, a voltage dividing output node N3, and a bandgap voltage reference source input terminal 232, wherein the bandgap voltage reference source input terminal 232 is connected to the bandgap voltage reference source. Vs, the voltage level of the bias current terminal N2 is equal to the voltage level of the bandgap voltage reference source Vs, and the voltage level of the voltage dividing output node N3 is lower than the voltage level of the bandgap voltage reference source Vs. The voltage levels of the output voltages Vout_A~Vout_M outputted by the output voltage terminals 113A-113M of the voltage stabilizing branch circuits 1A~1M are lower than the voltage level of the bias current terminal N2, that is, the output of the plurality of voltage levels is stable. The voltage level of the output voltages Vout_A~Vout_M outputted by the output voltage terminals 113A-113M of the voltage circuit 1 is lower than the voltage level of the bandgap voltage reference source Vs.
電源電壓Vin經由一偏壓電流源I提供所需之工作電流至能隙電壓調整電路2。The supply voltage Vin supplies the required operating current to the bandgap voltage adjustment circuit 2 via a bias current source I.
能隙電壓調整電路2包括有一源極隨耦電晶體21、一負載電晶體22、一第二放大器23及一分壓電路24。其中，在能隙電壓調整電路2中具有一偏壓電流端節點N2及一分壓輸出節點N3。The bandgap voltage adjusting circuit 2 includes a source follower transistor 21, a load transistor 22, a second amplifier 23, and a voltage dividing circuit 24. The bandgap voltage adjustment circuit 2 has a bias current end node N2 and a voltage dividing output node N3.
源極隨耦電晶體21具有一閘極端211、一源極端212及一汲極端213。其中，源極端212係連接至偏壓電流端節點N2。而負載電晶體22具有一閘極端221、一汲極端222及一源極端223，其中汲極端222係連接至源極隨耦電晶體21之汲極端213，源極端223係連至接地電位G，而閘極端221係連接至電源電壓Vin。The source follower transistor 21 has a gate terminal 211, a source terminal 212 and a drain terminal 213. The source terminal 212 is connected to the bias current terminal node N2. The load transistor 22 has a gate terminal 221, a drain terminal 222 and a source terminal 223. The drain terminal 222 is connected to the drain terminal 213 of the source follower transistor 21, and the source terminal 223 is connected to the ground potential G. The gate terminal 221 is connected to the power supply voltage Vin.
第二放大器23具有一偏壓電流連接端231，其為第二放大器23之負輸入端、一能隙電壓參考源輸入端232，其為第 二放大器23之正輸入端、及一輸出端233，其中偏壓電流連接端231係連接至偏壓電流端節點N2，能隙電壓參考源輸入端232係連接至能隙電壓參考源Vs，而輸出端233係連接至源極隨耦電晶體21之閘極端211。The second amplifier 23 has a bias current connection terminal 231, which is a negative input terminal of the second amplifier 23, and a bandgap voltage reference source input terminal 232, which is a positive input terminal of the second amplifier 23 and an output terminal 233, wherein the bias current connection terminal 231 is connected to the bias current terminal node N2, and the bandgap voltage reference source input terminal 232 is connected to the bandgap voltage reference source Vs, and The output terminal 233 is connected to the gate terminal 211 of the source follower transistor 21.
分壓電路24具有一第一分壓電阻241及一與第一分壓電阻241串聯連接之第二分壓電阻242，其中第一分壓電阻241與第二分壓電阻242之連接點係作為分壓輸出節點N3，第一分壓電阻241之另一端係連接至偏壓電流端節點N2，而第二分壓電阻242之另一端係連接至接地電位G。The voltage dividing circuit 24 has a first voltage dividing resistor 241 and a second voltage dividing resistor 242 connected in series with the first voltage dividing resistor 241. The connection point between the first voltage dividing resistor 241 and the second voltage dividing resistor 242 is As the voltage dividing output node N3, the other end of the first voltage dividing resistor 241 is connected to the bias current terminal node N2, and the other end of the second voltage dividing resistor 242 is connected to the ground potential G.
經由能隙電壓調整電路2之電路特性，可使得偏壓電流端節點N2之電壓準位等於能隙電壓參考源Vs的電壓準位(VN2 =Vs)，而分壓輸出節點N3之電壓準位則低於能隙電壓參考源Vs的電壓準位(VN3 <Vs)，故驅動元件11A~11M之輸出電壓端113A~113M之輸出電壓Vout_A~Vout_M之電壓準位低於能隙電壓調整電路2之偏壓電流端節點N2的電壓準位(Vout_A~Vout_M<VN2 )。Through the circuit characteristic of the bandgap voltage adjusting circuit 2, the voltage level of the bias current terminal N2 can be made equal to the voltage level of the bandgap voltage reference source Vs (V N2 = Vs), and the voltage of the voltage dividing output node N3 is The bit is lower than the voltage level of the bandgap voltage reference source Vs (V N3 <Vs), so the voltage levels of the output voltages Vout_A~Vout_M of the output voltage terminals 113A to 113M of the driving elements 11A to 11M are lower than the bandgap voltage adjustment. The voltage level of the bias current terminal N2 of the circuit 2 (Vout_A~Vout_M<V N2 ).
由上述可知，本發明之輸出電壓低於能隙電壓參考源的穩壓電路係可提供一可低於能隙電壓參考源Vs之多種不同低輸出電壓準位的輸出電壓Vout_A~Vout_M，用以供需要較低的多種不同輸出電壓的各種消費性電子產品使用。It can be seen from the above that the voltage stabilizing circuit of the present invention whose output voltage is lower than the bandgap voltage reference source can provide an output voltage Vout_A~Vout_M which can be lower than the different low output voltage levels of the bandgap voltage reference source Vs. For use in a variety of consumer electronics products that require a lower number of different output voltages.
以上所舉實施例僅係用以說明本發明，並非用以限制本發明之範圍，凡其他未脫離本發明所揭示之精神下而完成的等效修飾或置換，均應包含於後述申請專利範圍內。The above-mentioned embodiments are only intended to illustrate the invention, and are not intended to limit the scope of the invention, and other equivalent modifications or substitutions which are not departing from the spirit of the invention are intended to be included in the scope of the appended claims. Inside.
1‧‧‧多種電壓準位輸出穩壓電路1‧‧‧Multiple voltage level output voltage regulator circuits
1A‧‧‧穩壓分支電路1A‧‧‧Variable branch circuit
112A‧‧‧電源端節點112A‧‧‧Power end node
113A‧‧‧輸出電壓端113A‧‧‧Output voltage terminal
121A‧‧‧能隙電壓連接端121A‧‧‧gap voltage connection
122A‧‧‧回授輸入端122A‧‧‧Return input
1B‧‧‧穩壓分支電路1B‧‧‧Variable branch circuit
112B‧‧‧電源端節點112B‧‧‧Power end node
113B‧‧‧輸出電壓端113B‧‧‧Output voltage terminal
121B‧‧‧能隙電壓連接端121B‧‧‧gap voltage connection
122B‧‧‧回授輸入端122B‧‧‧Return input
1M‧‧‧穩壓分支電路1M‧‧‧ regulated branch circuit
112M‧‧‧電源端節點112M‧‧‧ power end node
113M‧‧‧輸出電壓端113M‧‧‧ output voltage terminal
121M‧‧‧能隙電壓連接端121M‧‧‧gap voltage connection
122M‧‧‧回授輸入端122M‧‧‧ feedback input
2‧‧‧能隙電壓調整電路2‧‧‧gap voltage adjustment circuit
232‧‧‧能隙電壓參考源輸入端232‧‧‧gap voltage reference source input
G‧‧‧接地電位G‧‧‧ Ground potential
N1A‧‧‧回授節點N1A‧‧‧Feedback node
N1B‧‧‧回授節點N1B‧‧‧Feedback node
N1M‧‧‧回授節點N1M‧‧‧Feedback node
N2‧‧‧偏壓電流端節點N2‧‧‧ bias current end node
N3‧‧‧分壓輸出節點N3‧‧‧voltage output node
Vin‧‧‧電源電壓Vin‧‧‧Power supply voltage
Vout_A‧‧‧輸出電壓Vout_A‧‧‧ output voltage
Vout_B‧‧‧輸出電壓Vout_B‧‧‧ output voltage
Vout_M‧‧‧輸出電壓Vout_M‧‧‧ output voltage
Vs‧‧‧能隙電壓參考源Vs‧‧‧gap voltage reference source
I‧‧‧偏壓電流源I‧‧‧ bias current source
Claims (3)
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| TW102109817A TWI480717B (en) | 2013-03-20 | 2013-03-20 | Output voltage is lower than the energy gap reference source and can provide a variety of different low-output voltage level regulator circuit |
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| TW102109817A TWI480717B (en) | 2013-03-20 | 2013-03-20 | Output voltage is lower than the energy gap reference source and can provide a variety of different low-output voltage level regulator circuit |
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Citations (6)
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| US5550495A (en) * | 1994-05-12 | 1996-08-27 | Sierra Semiconductor Corporation | All MOS voltage to current converter |
| US5610505A (en) * | 1995-08-31 | 1997-03-11 | Lucent Technologies, Inc. | Voltage-to-current converter with MOS reference resistor |
| CN102354241A (en) * | 2011-07-29 | 2012-02-15 | 美商威睿电通公司 | Voltage/current conversion circuit |
| TW201207591A (en) * | 2010-08-10 | 2012-02-16 | Novatek Microelectronics Corp | Linear voltage regulator and current sensing circuit thereof |
| TW201229737A (en) * | 2011-01-04 | 2012-07-16 | Richtek Technology Corp | Circuit and method for power path management |
| CN102945059A (en) * | 2012-11-21 | 2013-02-27 | 上海宏力半导体制造有限公司 | Low dropout linear regulator and pole adjustment method thereof |
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| US5550495A (en) * | 1994-05-12 | 1996-08-27 | Sierra Semiconductor Corporation | All MOS voltage to current converter |
| US5610505A (en) * | 1995-08-31 | 1997-03-11 | Lucent Technologies, Inc. | Voltage-to-current converter with MOS reference resistor |
| TW201207591A (en) * | 2010-08-10 | 2012-02-16 | Novatek Microelectronics Corp | Linear voltage regulator and current sensing circuit thereof |
| TW201229737A (en) * | 2011-01-04 | 2012-07-16 | Richtek Technology Corp | Circuit and method for power path management |
| CN102354241A (en) * | 2011-07-29 | 2012-02-15 | 美商威睿电通公司 | Voltage/current conversion circuit |
| CN102945059A (en) * | 2012-11-21 | 2013-02-27 | 上海宏力半导体制造有限公司 | Low dropout linear regulator and pole adjustment method thereof |
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