CN1447307A - Reference voltage circuit with controllable temperature coefficient and its method - Google Patents

Reference voltage circuit with controllable temperature coefficient and its method Download PDF

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Publication number
CN1447307A
CN1447307A CN 02108109 CN02108109A CN1447307A CN 1447307 A CN1447307 A CN 1447307A CN 02108109 CN02108109 CN 02108109 CN 02108109 A CN02108109 A CN 02108109A CN 1447307 A CN1447307 A CN 1447307A
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voltage
circuit
reference voltage
temperature coefficient
selected
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CN 02108109
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林志儒
李仲平
黄云朋
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华邦电子股份有限公司
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Abstract

This invention discloses a reference voltage circuit and method in which, utilizing a logic operator to control a multitask device and selecting an output voltage from the supplying voltage circuit corresponding to difference temperature coefficients, again utilizing an operation amplifier and an other multitask device controlled by above logic operator to adjust and amplify the selected voltage to a same reference voltage since the adjusted voltages are the same, it can prevent LCD panel from redesigning a circuit due to the variation of the temperature coefficiency.

Description

可控制温度系数的参考电压电路及方法 A reference voltage circuit and method can control the temperature coefficient

技术领域 FIELD

本发明涉及一种参考电压电路及方法,特别是关于一种可控制温度系数的参考电压电路及方法,适用于液晶显示面板。 The present invention relates to a reference voltage circuit and method, particularly with respect to the reference voltage circuit and method capable of controlling the temperature coefficient for the liquid crystal display panel.

以往的作法是制作具有不同温度系数的IC(集成电路)来符合不同的需求。 Conventional practice to produce different temperature coefficients having IC (integrated circuit) to meet different needs. 请参照图1所示,图中示出一教科书上常见的基本供电压电路,若要配合一个具有不同温度系数的LCD面板,参考电压Vf(Vf=VBE+αVTln(m)=Vd(gf)+gfΔTin)可通过改变α值来获得不同gf。 Referring to FIG. 1, is shown on a common basic textbook voltage supply circuit, to an LCD panel with a different temperature coefficient, the reference voltage Vf (Vf = VBE + αVTln (m) = Vd (gf) + gfΔTin) can be obtained by varying α gf different values. 亦即提供不同αR的电阻以获得不同的参考电压Vf。 I.e., provide resistance to obtain different αR different reference voltages Vf. 温度电压当量(VT=kTin/q)具温度相依性,所以改变α便可以改变gf,可以稍微补偿面板温度效应,例如面板操作温度改变而使其亮度发生改变。 Equivalent temperature voltage (VT = kTin / q) has a temperature dependence, the GF can be changed α changes, the panel can be slightly compensated temperature effects, for example, the operation panel changes its brightness temperature change.

然而,虽然gf符合了LCD面板的需求了,但是,Vf中的DC电压Vd确会受α的变化而受影响(Vd=Vd(gf))。 However, although gf meet the needs of the LCD panel, however, the DC voltage Vd Vf is determined will be affected by changes in the affected α (Vd = Vd (gf)). 如果所产生的Vd飘移过大,便无法输出所要的LCD驱动电压,需重新设计LCD电压产生电路。 If Vd generated drift too large, it can not output the LCD drive voltage to the need to re-design LCD voltage generation circuit.

简单来说,当以习知的电压产生电路产生参考电压时,会有下列两项缺点:(1)如果改变LCD面板的温度系数,便必须重新设计一个新的IC,以获得正确的gf。 Briefly, when in the conventional voltage generating circuit generates a reference voltage, have the following two disadvantages: (1) If the change of the temperature coefficient of the LCD panel, they must be re-designed a new the IC, to obtain the correct gf.

(2)由于新的IC所产生的参考电压Vf中的DC电压Vd会随着gf的变化而不同,所以需再重新一驱动电压产生电路。 (2) Since the DC voltage Vd new reference voltage Vf generated in the IC will vary gf differ, so the need to re-driving a voltage generating circuit.

两项缺点都必须要设计并更换一个新的IC,这对于LCD制造厂而言,一方面会增加成本,另一方面会影响产品上市的时间,失去先机。 Two shortcomings must be designed and replaced with a new IC, which for the purposes of LCD factory, on the one hand increases the cost, on the other hand will affect the time to market, missing the boat.

为实现上述目的,本发明提出一可控制温度系数的参考电路,以两个步骤产生参考电压:第一步骤是依据所需要的温度系数选择一个输出电压,输出电压的温度系数为一个默认值,基本上已经符合需求,输出电压的直流电压可能不符合需求;第二步骤是将输出电压加以调节性的放大,以产生参考电压。 To achieve the above object, the present invention provides a controllable temperature coefficient reference circuit generating a reference voltage in two steps: The first step is the temperature coefficient selected based on a desired temperature coefficient of the output voltage, output voltage as a default value, basically meet the requirements, the output voltage of the DC voltage may not meet the demand; second step amplifies the output voltage of the regulator, to generate a reference voltage. 这样,参考电压中的DC电压与温度系数均会完全的符合需求。 Thus, the temperature coefficient of the reference voltage and the DC voltage are completely in line with needs.

根据本发明提供的一种可控制温度系数的参考电压电路,用以产生一参考电压,其输入端连接一微处理界面,而输出端连接一LCD电压产生电路,特特点是,包括:一逻辑运算器,用以接收一指令,相对应于一LCD面板的温度系数,并输出相对应于该指令的一选择信号;一选择性供电压电路,用以接收该选择信号来产生一择选电压,以对应该选择信号;其中,该参考电压系依据该择选电压而产生。 According to the present invention provides a controllable temperature coefficient reference voltage circuit for generating a reference voltage, an input terminal connected to a microprocessor interface, LCD output terminal is connected a voltage generating circuit, characterized Laid, comprising: a logic arithmetic unit for receiving an instruction corresponds to a temperature coefficient of the LCD panel, and outputs to the instruction corresponding to a selection signal; receiving the selection signal to generate a selection voltage is selected from a selective voltage supply circuit for , should be selected in order to signal; wherein the reference voltage line is selected according to the selection voltage is generated.

逻辑运算器接收一指令,耦合于选择性供电压电路及调整电压电路,当使用者需改变LCD面板温度系数时,选择性供电压电路接收逻辑运算器的选择信号并接着输出一择选电压至调整电压电路,此时,逻辑运算器同时输出选择信号至调整电压电路,使调整电压电路对应于择选电压并将其放大调整成具有相同DC电压的参考电压,然后输入LCD电压产生电路。 Logic operator receives a command, selectively coupled to the voltage supply circuit and a voltage adjustment circuit, when the user needs to change the temperature coefficient of the LCD panel, a selection signal to selectively supply voltage circuit receives logical operator and then outputs a voltage to the selected select voltage adjustment circuit, this time, the logic operation simultaneously outputs a selection signal to the voltage adjustment circuit, the adjustment circuit corresponding to the voltage selection and amplification adjustment voltage is selected to have the same voltage DC reference voltage, and an input voltage generation circuit LCD.

所述的选择性输出电压电路包括:一供电压电路,具有若干个输出端,用以输出对应若干个温度系数的若干个待选择电压;一第一多任务器,用以接收该逻辑运算器的选择信号,并选择该待选择电压其中之一来作为一择选电压。 Said selective output voltage circuit comprising: a voltage supply circuit having a plurality of output terminals, for outputting a number corresponding to a plurality of temperature coefficient to be selected voltage; a first multiplexer for receiving the logical operator a selection signal, and selects one of the voltage to be selected, wherein the selected voltage as a selection.

所述的择选电压包含有一直流电压以及一电路温度系数,该参考电压电路还包括一调整电压电路,受控于该逻辑运算器,用以将该直流电压调整成一特定电压;所述的调整电压电路系为一电压放大电路,该逻辑运算器系控制该电压放大电路的放大倍数。 Optional said selected voltage comprises a DC voltage circuit and a temperature coefficient, the reference voltage circuit further comprises a voltage adjusting circuit, is controlled by the logical operator to adjust the DC voltage to a particular voltage; adjusting said voltage circuit is a voltage based amplifier circuit, the logical operator based amplification factor controlling the voltage amplification circuit. 而所述的调整电压电路包括:一运算放大器,具有一正输入端用以接收该择选电压、一负输入端以及一输出端;若干个电阻,串接于该输出端与一接地线之间,并形成若干个接点;一第二多任务器,受控于该逻辑运算器,以选择该等接点其中之一连接至该负输入端;所述的电阻具有相同的温度系数;所述的若干个电阻以同一型态的电阻所构成;或是多晶硅电阻或是井电阻。 And said voltage adjusting circuit comprising: an operational amplifier having a positive input terminal for receiving the selection voltage is selected, a negative input terminal and an output terminal; a plurality of resistors, connected in series with the output terminal and a ground line of between, and forming a plurality of contacts; a second multiplexer, controlled by the logical operator to select which one of these contacts is connected to the negative input terminal; resistor having the same temperature coefficient; the in several resistors of the same resistance patterns formed; or well resistors or polysilicon resistors.

一种产生一参考电压的方法,其包括下列步骤:提供若干个待选择电压,每个待选择电压有不同的温度系数;选择待选择电压之一为择选电压;以及相对应择选电压,输出参考电压。 A method for generating a reference voltage, comprising the steps of: providing a plurality of voltages to be selected, each selection voltage has to be different temperature coefficients; selecting one of the voltage to be selected as the selected selection voltage; and a voltage corresponding to a selection option, output reference voltage. 上述输出参考电压的步骤包括下列步骤:选择一放大倍数;以及以放大倍数放大择选电压而形成参考电压,该放大倍数是参考电压含有一不随温度系数不同而变化的直流电压。 Above the reference voltage output step comprises the steps of: selecting a magnification; and enlarged at a magnification selection voltage is selected to form the reference voltage, the amplification factor is a DC voltage with a reference voltage does not contain a different temperature coefficients varies.

本发明与已有技术相比,具有下列的优点:(1)利用原有的微处理器界面2来控制此参考电压电路,故其电路配置无需增加额外接脚,亦即保留习知的电路配置,方便于使用者直接使用;(2)使用不同温度系数的LCD面板时,不需更改参考电压电路,有助于简化制造工艺流程及降低成本;(3)由于本发明是先以通用的温度系数当作本发明的可控制温度系数的参考电压电路中参考电压的温度系数默认值(default value),所以大多数的LCD面板均可以直接使用本发明的电路。 Compared with the prior art the present invention has the following advantages: (1) 2 this reference voltage circuit is controlled, so that the circuit configuration without adding additional pins, i.e. to retain the conventional microprocessor interface circuit uses the original configuration convenient for a user directly; (2) using different temperature coefficients of the LCD panel, without changing the reference voltage circuit, helps to simplify the manufacturing process and reduce costs; (3) Since the present invention is the first generic to as the temperature coefficient of the reference voltage circuit of the present invention can control the temperature coefficient of the temperature coefficient of the reference voltage is the default value (default value), so most of the LCD panel can be used as the circuit according to the present invention. 而温度系数不同的LCD面板,也只要变更不同的程序数据D1设定,即可运用本发明的电路。 Different temperature coefficient of the LCD panel, but also by changing the setting of different program data D1, to the use of the circuit according to the present invention.

VoN~输出电压; Von~择选电压;Vfn~参考电压。 Output voltage VoN ~; Von ~ Optional selected voltage; Vfn ~ reference voltage.

请参照图2到图4,其显示出本发明实施例中一种可控制温度系数的参考电压电路。 Please refer to FIG. 2 to FIG. 4, which shows a reference voltage circuit in a controlled temperature coefficient of the embodiment of the present invention.

举例来说,本发明可应用于一LCD面板,首先请参照图2,图中示出本发明中可控制温度系数的参考电压电路示意图,其参考电压电路包括:一逻辑运算器1、一选择性供电压电路3及一调整电压电路5。 For example, the present invention is applicable to a LCD panel Referring first to FIG 2, there is shown a schematic diagram of the reference voltage circuit of the present invention can control the temperature coefficient, which is the reference voltage circuit comprises: a logic function, a selection 3 of the supply voltage circuit and a voltage adjustment circuit 5. 逻辑运算器1耦合于选择性供电压电路3及调整电压电路5,当使用者需改变LCD面板温度系数(亦即,使用不同LCD面板)时,将程序数据D1由原有的微处理器界面2输入至逻辑运算器1,逻辑运算器1便输出选择信号C1。 Logic function is selectively coupled to a supply voltage circuit 3 and the voltage adjustment circuit 5, when the user needs to change the temperature coefficient of the LCD panel (i.e., the use of the LCD panel), the microprocessor program data D1 from original interface 2 is input to the logical operator 1, a logical operator then outputs the selection signal C1. 选择性供电压电路3在接收到逻辑运算器1的选择信号C1后,便会输出一择选电压Von至调整电压电路5,此时,逻辑运算器1同时将选择信号C1输出至调整电压电路5,使调整电压电路5对应于择选电压Von并将其放大调整成具有相同DC电压的参考电压Vfn,然后输入LCD电压产生电路4。 Selective voltage supply circuit 3 after receiving the logical operator is a selection signal C1, the output will be selected from a selection voltage Von to the voltage adjusting circuit 5, at this time, while the logic function selection signal C1 to the output voltage adjusting circuit 5, the adjusting circuit 5 corresponding to the voltage selected from optional voltages Von and amplifies the reference voltage Vfn adjusted to have the same DC voltage, and an input voltage generation circuit 4 LCD.

接着请参照图3-1,图中示出上述选择性供电压电路3的示意图,其包括:一供电压电路7及一第一多任务器9。 Referring next to FIG 3-1, a schematic view of the above-described selective voltage supply circuit 3 is shown, comprising: a voltage supply circuit 7 and a first multiplexer 9. 此供电压电路7具有若干输出端,亦即其具有若干输出电压Vo1、Vo2、、、VoN,如图3-2所示,图中为运用于本发明的一个可产生多种输出电压值的电路,基本上为图1的改进,可同时具有多组不同αR的电阻存在于电路中,其参考电压Vf可由不同αR的电阻来获得,且参考电压Vf具温度相依性。 This voltage supply circuit having a plurality of output terminals 7, i.e. having a plurality of output voltages Vo1, Vo2 ,,, VoN, shown in Figure 3-2, the figures may be generated as a plurality of output voltage applied to the present invention. circuit, FIG. 1 is substantially improved, which can have a voltage Vf having a temperature dependence of resistance of different sets αR present in the circuit, which resistance may be different from the reference voltage Vf αR be obtained, and the reference. 第一多任务器9受控于逻辑运算器1且与供电压电路7相耦合。 A first multiplexer 9 is controlled by the logical operator 1 and the voltage supply circuit 7 is coupled. 对应一温度系数gfn,第一多任务器9接收来自逻辑运算器1的选择信号C1,以选择一自供电压电路7的若干输出端并输出一择选电压Von---(具温度相依性)至调整电压电路5。 GFN corresponding to a temperature coefficient, a first multiplexer 9 receives a selection signal C1 from the logic operation unit 1, to select the output of a plurality of self-powered voltage circuit 7 and outputs a selected select voltage Von --- (having a temperature dependency) 5 to adjust the voltage circuit. Von与温度的关系为Von=Vd(gfn)+(gfn/An)ΔTin-------(20)其中,An为一放大倍数,随着温度系数gfn而有所不同。 Von is the relationship between temperature and Von = Vd (gfn) + (gfn / An) ΔTin ------- (20) wherein, An is a magnification coefficient gfn as the temperature varies. 稍后会更详细的说明。 It will be described in more detail later.

为了同时解决Vd随着gfn不同而改变的问题,本发明在参考电压电路中加入一调整电压电路5。 In order to simultaneously solve the problems with different gfn Vd is changed, the present invention is added to the reference voltage circuit, a voltage adjusting circuit 5. 接着请参照图4,图中示出上述调整电压电路5的示意图,其包括:一运算放大器(Op.Amp.,OA)11及一第二多任务器13。 Next, please refer to FIG. 4, a schematic view of the adjustment voltage circuit 5 is shown, which comprises: (. Op.Amp, OA) an operational amplifier 11 and a second multiplexer 13. 此运算放大器11的输出端至接地线间串接具有相同温度系数的若干电阻(如R1、R2至RN等);正输入端则耦合于第一多任务器9;第二多任务器13受控于逻辑运算器1及运算放大器11之间,用以选择串联电阻中的一接点与运算放大器11的负输入端相连接。 This output terminal of the operational amplifier 11 to the ground line connected in series between the plurality of resistors having the same temperature coefficient (e.g., R1, R2 to RN, etc.); the positive input terminal coupled to the first multiplexer 9; second multiplexer 13 by logical operator control to the operational amplifier between 1 and 11, to select a point in the series resistance of the operational amplifier 11 is connected to the input negative. 当放大器11接收选择电压Von时,选择信号C1同时使第二多任务器13选择串接若干电阻中一接点。 When the amplifier 11 receives a selection voltage Von, a second selection signal C1 while the multiplexer 13 selects a plurality of resistors connected in series in a joint. 如此,对应不同的择选电压Von,第二多任务器13可从若干电阻中选择适当的接点。 Thus, corresponding to different voltage Von selected optional, second multiplexer 13 may be appropriately selected from the plurality of resistor contacts. 串联电阻的负回馈与运算放大器11构成了一个放大电路,所以调整电压电路5的放大倍数An便可以确定。 Negative feedback series resistor and operational amplifier 11 constitute an amplifying circuit, the adjustment magnification An voltage circuit 5 can determine. 经由放大器11产生对应的放大倍数An,所以Vfn=Von*An=[Vd(gfn)+gfn/An*ΔTin]*An=Vd(gfn)*An+gfn*ΔTin-------(21)如果,在电路设计时,便将Vd(gfn)*An设计为不随着gfn变化的常数值Vdd,则方程式(21)将变成Vfn=Vdd+gfn*ΔTin---------(22) An amplification factor produced by a corresponding amplifier 11, so Vfn = Von * An = [Vd (gfn) + gfn / An * ΔTin] * An = Vd (gfn) * An + gfn * ΔTin ------- ( 21) If the circuit design, put Vd (gfn) * An designed not as a constant value Vdd gfn change, equation (21) becomes Vfn = Vdd + gfn * ΔTin ------- --(twenty two)

方程式(22)有一个特点,不论gfn为多少,Vfn的直流电压Vdd都将会是个常数。 Equation (22) has a characteristic, regardless of how much gfn, DC voltage Vdd are Vfn will be a constant. 换句话说,就算是LCD面板的温度系数有所改变,本发明仅仅需要对逻辑处理器1写入不同的程序数据D1,便可以获得到一个参考电压Vfn。 In other words, even if the temperature coefficient of the LCD panel is changed, the present invention is only necessary to write a different logical processor program data D1, it is possible to obtain a reference voltage Vfn. 这个参考电压Vfn中的温度系数gfn可以符合LCD面板的温度系数。 The temperature coefficient of the reference voltage Vfn gfn may comply with the temperature coefficient of the LCD panel. 同时,参考电压Vfn中直流电压Vdd将会是可预期的一个固定值,所以,LCD电压产生电路4将不必要重新设计。 Meanwhile, the reference voltage of the DC voltage Vdd Vfn contemplated will be a fixed value, therefore, the LCD voltage generating circuit 4 unnecessary redesign.

调整电压电路5中的串接电阻可以用相同型态的电阻来构成,譬如说,全部都是井电阻,或是全部都是多晶硅电阻。 Series resistor voltage adjustment circuit 5 may be constituted by the same resistance patterns, for instance, are all well resistors, or are all polysilicon resistor. 如此,调整电压电路5的放大倍数(An=(R1+...+Rn)/RT,RT=R1+...+RN)将不会受到温度的影响而改变,也才不会对最后的参考电压Vfn的温度系数产生不良的影响。 Thus, the voltage magnification adjustment circuit 5 (An = (R1 + ... + Rn) / RT, RT = R1 + ... + RN) will not be affected by temperature changes, will not be the last reference to the temperature coefficient of the voltage Vfn adverse effect.

本发明虽以较佳实施例公开如上,但是它并不是用来限定本发明的范围,任何熟习此项技艺者,在不脱离本发明的精神和范围内,应当可做一些更动与润饰,因此本发明的保护范围应当以本专利申请的权利要求书所界定的范围为准。 Although the disclosed embodiment of the present invention to the preferred embodiments described above, but it is not intended to limit the scope of the present invention, any person skilled in the art, without departing from the spirit and scope of the present invention, should do some alterations and modifications, Therefore, the scope of the invention should be claimed in the present patent application, the scope of the claims and their equivalents.

Claims (11)

1.一种可控制温度系数的参考电压电路,用以产生一参考电压,其输入端连接一微处理界面,而输出端连接一LCD电压产生电路,特征在于,包括:一逻辑运算器,用以接收一指令,相对应于一LCD面板的温度系数,并输出相对应于该指令的一选择信号;一选择性供电压电路,用以接收该选择信号来产生一择选电压,以对应该选择信号;其中,该参考电压系依据该择选电压而产生。 1. A controlled temperature coefficient reference voltage circuit for generating a reference voltage, an input terminal connected to a microprocessor interface, LCD output terminal is connected a voltage generating circuit, comprising: a logical operation unit, with to receive an instruction corresponds to a temperature coefficient of the LCD panel, and outputs to the instruction corresponding to a selection signal; a selective voltage supply circuit for receiving the selection signal to generate a selection voltage is selected to be of a selection signal; wherein the reference voltage line is selected according to the selection voltage is generated.
2.如权利要求1所述的可控制温度系数的参考电压电路,其特征在于,所述的选择性输出电压电路包括:一供电压电路,具有若干个输出端,用以输出对应若干个温度系数的若干个待选择电压;一第一多任务器,用以接收该逻辑运算器的选择信号,并选择该待选择电压其中之一来作为一择选电压。 2 can control the temperature coefficient of the reference voltage circuit as claimed in claim 1, wherein said selective output voltage circuit comprising: a voltage supply circuit having a plurality of output terminals, for outputting a corresponding plurality of temperature a plurality of coefficients to be selected voltage; a first multiplexer for receiving the selection signal of the logical operator, and select the one to be selected as a voltage selected from optional voltages.
3.如权利要求1所述的可控制温度系数的参考电压电路,其特征在于,所述的择选电压包含有一直流电压以及一电路温度系数,该参考电压电路还包括一调整电压电路,受控于该逻辑运算器,用以将该直流电压调整成一特定电压。 3 can control the temperature coefficient of the reference voltage circuit as claimed in claim 1, wherein said selection voltage is selected with a DC voltage circuit and a temperature coefficient, the reference voltage circuit further includes a voltage adjustment circuit, receiving the logical operator to control, for adjusting the DC voltage to a certain voltage.
4.如权利要求3所述的可控制温度系数的参考电压电路,其特征在于,所述的调整电压电路系为一电压放大电路,该逻辑运算器系控制该电压放大电路的放大倍数。 As claimed in claim 3 can control the temperature coefficient of the reference voltage circuit, wherein the voltage adjusting circuit is a voltage based amplifier circuit, the logical operator based amplification factor controlling the voltage amplification circuit.
5.如权利要求3所述的可控制温度系数的参考电压电路,其特征在于,所述的调整电压电路包括:一运算放大器,具有一正输入端用以接收该择选电压、一负输入端以及一输出端;若干个电阻,串接于该输出端与一接地线之间,并形成若干个接点;一第二多任务器,受控于该逻辑运算器,以选择该等接点其中之一连接至该负输入端。 5 can control the temperature coefficient of the reference voltage circuit as claimed in claim 3, wherein said voltage adjusting circuit comprising: an operational amplifier having a positive input terminal for receiving the selection voltage is selected, a negative input terminal and an output terminal; a plurality of resistors connected in series between the output terminal and a ground line, and a plurality of contacts are formed; a second multiplexer, controlled by the logical operator to select the point where such one is connected to the negative input terminal.
6.如权利要求5所述的可控制温度系数的参考电压电路,其特征在于,所述的电阻具有相同的温度系数。 As claimed in claim 5, wherein controllable temperature coefficient reference voltage circuit, wherein said resistor has the same temperature coefficient.
7.如权利要求5所述的可控制温度系数的参考电压电路,其特征在于,所述的若干个电阻以同一型态的电阻所构成。 As claimed in claim 5, wherein controllable temperature coefficient reference voltage circuit, characterized in that said plurality of resistors in the resistor formed of the same patterns.
8.如权利要求7所述的可控制温度系数的参考电压电路,其特征在于,所述型态的电阻为多晶硅电阻或是井电阻。 As claimed in claim 7 controllable temperature coefficient reference voltage circuit, wherein the resistance patterns is well resistors or polysilicon resistors.
9.一种产生可控制温度系数的参考电压的方法,其包括下列步骤:提供若干个待选择电压,每个待选择电压有不同的温度系数;选择该待选择电压之一为择选电压;以及相对应该择选电压,输出该参考电压。 A method of controlling the temperature coefficient of the reference voltage is generated, comprising the steps of: providing a plurality of voltages to be selected, each selection voltage has to be different temperature coefficients; selecting a selected one of the voltage to be selected from the selection voltage; should be selected and the relative selection voltage, the reference voltage output.
10.如权利要求9所述的产生可控制温度系数的参考电压的方法,其特征在于,所述输出参考电压的步骤包括下列步骤:选择一放大倍数;以及以放大倍数放大该择选电压而形成该参考电压。 10. The generating method of claim 9, said reference voltage temperature coefficient can be controlled, characterized in that the reference voltage output step comprises the steps of: selecting a magnification; and a magnification of the zoom option selection voltage the reference voltage is formed.
11.如权利要求10所述的产生可控制温度系数的参考电压的方法,其特征在于,所述放大倍数使该参考电压含有一不随温度系数不同而变化的直流电压。 11. The generation method of claim 10, said reference voltage temperature coefficient can be controlled, characterized in that said magnification such that the reference voltage comprises a DC voltage does not vary with the temperature coefficient varies.
CN 02108109 2002-03-26 2002-03-26 Reference voltage circuit with controllable temperature coefficient and its method CN1447307A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100412944C (en) 2005-01-14 2008-08-20 川崎微电子股份有限公司 Overdrive circuit and liquid crystal display panel driving apparatus including the same
US8462180B2 (en) 2006-06-30 2013-06-11 Thomson Licensing Method for grayscale rendition in an AM-OLED

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100412944C (en) 2005-01-14 2008-08-20 川崎微电子股份有限公司 Overdrive circuit and liquid crystal display panel driving apparatus including the same
US8462180B2 (en) 2006-06-30 2013-06-11 Thomson Licensing Method for grayscale rendition in an AM-OLED

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