CN103150077A - Circuit device - Google Patents

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CN103150077A
CN103150077A CN 201310105290 CN201310105290A CN103150077A CN 103150077 A CN103150077 A CN 103150077A CN 201310105290 CN201310105290 CN 201310105290 CN 201310105290 A CN201310105290 A CN 201310105290A CN 103150077 A CN103150077 A CN 103150077A
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capacitor
control
circuit
circuit device
terminal
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CN 201310105290
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Chinese (zh)
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保罗·格兰德维兹
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苏州瀚瑞微电子有限公司
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Abstract

The invention relates to a circuit device, a terminal of which is connected to a circuit network stimulated by a stimulating source, wherein the circuit device comprises at least one controllable power supply and at least one capacitor. The invention also relates to a method for connecting the terminal with the controllable power supply through the capacitor, wherein the control function of at least one output end of the controllable power supply is within a potential parameter range of the terminal or stimulating source. The circuit device is simple in structure; and because the circuit device is used for regulating the capacitor, in order to use an internal voltage source, nodes inside the circuit device are set, and thus the influence of a parasitic element is eliminated.

Description

电路装置 Circuit means

技术领域 FIELD

[0001] 本发明涉及一种电路装置,尤其是指高精度的不同电容调节方法,可用于测量手指或其它类似物体在触摸屏、触摸平板和触摸按键等应用上的电容变化。 [0001] The present invention relates to a circuit arrangement, particularly to high-precision capacitance adjustment Different methods can be used to measure the change in capacitance finger or the like object on the touch screen, touch pad and other touch key applications.

背景技术 Background technique

[0002]目前测量所述触摸感应表面电极间的电容方法有很多。 [0002] The method of the current capacitance measured between the electrodes of the touch sensing surface are numerous. 一种方法是通过测量每个电极之间的电容,并且将当前测量得到的电容量与相同电极的先前测量值进行比较,这种测量方法通过震荡电路中的电极以及测量电路中的频率而完成,所述震荡电路的频率与电极的电容量相关,且频率的变化与电极电容量的变化有关;另一种方法涉及电桥中的电极(参阅US2010/0315102A1),所述电桥上有电压变化,且可测量两个节点之间上的电压变化;由于电压的变化是用来计算电容量,所以第三种方法不是测量电桥中的电压变化,而是调整电桥直到所述两个节点间不存在电压差为止,在这种情况下,所述电桥电路中元器件的变化可以用来测量未知电容。 One method is by measuring the capacitance between each electrode and the current measured capacitance measurement previously obtained with the same electrodes value, this measurement is accomplished by an electrode and the oscillation circuit of the frequency measurement circuit the oscillation frequency of the electrode capacitance of the associated circuit, and the change of the electrode capacitance change related frequency; another method relates to an electrode in the bridge (see US2010 / 0315102A1), the electrical bridge voltage changes, and measurable change in the voltage between two nodes; due to changes in voltage are used to calculate the capacitance, the third method instead of measuring the voltage change in the bridge, but the bridge until the two adjustment the voltage difference between the node does not exist so far, in this case, the bridge circuit may be used to measure changes in components of the unknown capacitance.

[0003] 因此,对于平衡电路中一个实体的测量重量而言,整个平衡电路的测量重量不是很重要,仅需要一个模块中附加的重量与其他模块中未知的重量相匹配即可。 [0003] Thus, for measuring the weight of a balancing circuit entity, measuring the weight balance of the entire circuit is not important, only one module and the additional weight other modules to match the unknown weight. 所以,对于变化电容的测量、测量电桥电路中整体的电容量都不是很重要,只有满足电桥电路中元器件的变化与待测电极电容量的变化相匹配即可,如果电桥电路是由已知电容和已测电极构成,从已知元器件的关系中,就可以获得未知电极的电容值。 Therefore, it is important not to change the measured capacitance, the overall capacitance measuring bridge circuit, the bridge circuit only to meet changes in the capacitance change of the test electrode components to match, if the bridge circuit is and measured by the known capacitance electrodes, from the known relationship between the components, the unknown capacitance value can be obtained electrode. 如果电桥电路中配置了若干个电极,那么就可得知电容数值的变化量,对于电容式触控系统中触摸检测而言,涉及所述感应电极的绝对值就不重要了,只需要了它们的变化量即可。 If the bridge circuit arranged several electrodes, it can know the variation in capacitance values, for a capacitive touch system, the touch detection, relates to the absolute value of the sensing electrode is not important, only the they can change the amount.

[0004] 由于所述电容器只转移可变电压,所以电容式电桥电路必须使用可变电压,目前原则上有多种方法可以获得可变电压,第一种方法是使用具有恒定频率的交流电压如正弦波电压;第二种方法是使用突变电压,其可选择系统从初始平衡到下一个平衡。 [0004] Since the transfer only the variable capacitor voltage, the capacitive bridge circuit is a variable voltage must be used, there are several ways to obtain a variable voltage, in principle, the first method is to use an AC voltage having a constant frequency the sine wave voltage; second method uses the abrupt voltage, which selectively system from an initial balance to a balance. 第一种方法的缺点是对于一个确定的物理系统,其阻抗是不可避免的,而测量电压的幅值也取决于此阻抗值,且所有电路的元器件中都包括电阻,用于感应界面的线路的电阻或者开关或者电极之间也存在电阻。 Disadvantage of the first method for determining a physical system, and its impedance is inevitable, but the amplitude of the voltage measured impedance value also depends on this, and all the components circuit comprises a resistor for sensing interface there is resistance or resistance between the electrodes or the switching lines. 由于电容电路中频率的响应依赖于电阻R和电容C,因此第二种方法可以克服上述缺点,其通过平衡状态使这些电阻的影响消失。 Since the capacitive circuit in response to the frequency-dependent resistor R and a capacitor C, with the second method can overcome the above disadvantages, which make influence by the disappearance of these resistors equilibrium state.

[0005] 当测量传感器电极的不同电容时,传统方法可以使用三个电极组成一个电桥电路。 [0005] When different sensor electrode capacitance measurement, the conventional method may be used to form a three electrode bridge circuit. 请参阅图1所示意的一个实施例,图1是三个电极的抽象平面图,在三个电极之间连有非常关键的三个电容,若所述三个电极分别命名为A,B和C,所述一个电极的电压通过外部电压源或者依赖其它节点上的电压以及电极间节点的电容值来获得,每个电极与参考地之间的电容称为Cb,电极节点之间的电容称为Cf。 Please refer to FIG. 1 one embodiment of the illustrated embodiment, FIG. 1 is a plan view of three electrodes abstract, there are between three electrodes connected three capacitors very critical, if the three electrodes are designated as A, B and C , a voltage of the electrode through the external voltage source or voltage-dependent capacitance value between the electrodes and the node on the other nodes to obtain the capacitance between each electrode and the reference referred Cb, the capacitance between the electrodes referred to as nodes Cf.

[0006] 由于所述系统可被抽象成一个普通的电容网络,因此可以忽略被电压源控制的节点之间的电容,且该电容不会影响其它的电路。 [0006] Since the system can be abstracted into a common capacitor network, the capacitance can be ignored between nodes is controlled voltage source, and the capacitor does not affect other circuits. 下面开始不同的假设,若激发节点B并且测量节点A和C的数值,此时得到一个电桥电路,请参考图2所示;若激发节点A和C并且测量节点B的数值,此时得到一个T型网络,称为电平衡电路,请参考图3所示,第一种方法被称为方法O或MO,第二种方法被称为方法I或Ml。 The following assumptions different start, if the Node B and the measurement value of excitation nodes A and C, this time to obtain a bridge circuit, please refer to FIG. 2; if the excitation nodes A and C and the value of the Node B measurements obtained at that time a T-network, called an electric balance circuit, please refer to FIG. 3, a first method is referred to method O or MO, the second method is referred to method I or Ml.

[0007] 如果用一种优良的方法设计和制造感应区,所述电容Cb可以互相匹配,电容Cf也可以互相匹配。 [0007] If an excellent design and manufacturing method of sensing area, the capacitance Cb can be match with each other, capacitance Cf can be matched to each other. 那么在方法MO中,用一个信号激励节点B,若没有手指触碰,在所述节点A和C将产生相同的响应;而在方法Ml中,用一个信号激励节点A,一个相反的信号激励节点C,若没有手指触碰,那么在节点B处无响应。 Then the MO method, the excitation signal with a Node B, if there is no finger touch, the nodes A and C will produce the same response; Ml in the method, the excitation signal with a node A, a reverse excitation signal node C, if no finger touch, then no response at the node-B. 由于手指与电极之间有电容式感应,所以电路的响应不再平衡,对方法MO而言,所述节点A处的响应与节点C处的响应不同;对方法Ml而言,所述节点A的激励若不能被相反激励的节点C抵消时,节点B处有响应。 Since the capacitance between the finger and the sensing electrode, so the response of the circuit is no longer balanced, in terms of the MO method, different from the node C in response to the response at the node A; Ml method terms, the node A if the node can be excited when the excitation of the opposite offset C, the node B responds. 为了获得更多关于手指改变电路平衡的信息,若测量电路不平衡时的振幅,从中得到想要的数值,或者通过调整电路中一个或多个元件的数值来补偿手指的影响,使电路再次平衡。 To get more balanced on the finger information changing circuit, if the unbalance measuring circuit when the amplitude, obtained from the desired value, or to compensate for the effects of the finger by a value or a plurality of circuit elements of the adjustment, the circuit again balance . 在这种情况下,可以利用元件数值的变化作为手指影响系统程度的信息。 In this case, changes in component values ​​can be used as the information influence degree finger system.

[0008] 一个理想的电容器,电容量作为它的属性,显示这个元件的电荷量,再结合电路的其他元件,对于电压可以根据公式Q=CV来计算。 [0008] In an ideal capacitor, the capacitance as its property, the charge amount of the display elements, combined with the other elements of the circuit, the voltage can be calculated according to the formula = CV Q. 其中变量Q代表储存在电容器中的电量,变量C代表电容器的电容量,变量V代表经过电容器的电压。 Wherein Q variable representing the charge stored in the capacitor, a variable capacitor C represents the capacitance, V represents the voltage across variable capacitor.

[0009] 上述公式在现实中被应用在一定范围内,由于存在最大电压,因此电容器可以存储能量,或者有其它界限来限制该范围使得上述功能是有效的。 [0009] In reality, the above formula is applied within a certain range, due to the maximum voltage, the capacitor may store energy, or other such boundaries to limit the scope of the above-described function is effective. 由于电容器是被动元件,当应用在集成电路环境下时,总是会有与电容器连接的元件对电容器产生影响。 Since the capacitor is a passive device, when applied in an integrated circuit environment, the capacitor will always have an impact on the capacitor connected to the element. 例如,电容器的连接是通过半导体材料,也就是说通过一个二极管连接电容器,电容器也可以通过一个晶体管制成,此时晶体管的源极和漏极被使用,致使电容不是固定的,而依赖于电压大小。 For example, the capacitor is connected through a semiconductor material, that is connected to a capacitor via a diode, a capacitor may be formed by a transistor, the source and drain of the transistor at this time is used, so that the capacitor is not fixed, but depends on the voltage size. 正因如此,这些元件如电容器在一定范围内工作时,在这个范围内这些元件的功能可以用公式Λ Q=C Λ V来表示。 For this reason, these elements work as the capacitor is within a certain range, within this range of these functional elements can be formulated Λ Q = C Λ V is represented.

[0010] 由于所有所述元件都是被动元件,当电容器被可变电容实施时,许多方法均可利用,下面介绍部分方法,在所有实施方式中均会利用开关,且开关也是被动元件,然而,由于电源的引入会影响性能从而导致元件的作用就像被动电容。 [0010] Since all of the elements are passive elements, when the capacitor is a variable capacitance embodiments, many methods may be utilized, part of the method described below, in all embodiments the switch will use, and the switching elements are passive, whereas Since the introduction will affect the performance of the power element leading role as a passive capacitor. 此外,上述元件不必在一段时间和一个连续的方式作为电容器执行,只有在某些时刻预设的性能才能出现,因此本发明描述了该元件。 Further, the element do not have a period of time and continuous manner as a capacitor executed only preset performance at some point to appear, thus the present invention describes the element.

[0011] 常见的一种调整电容器的电容量的方式是构建若干个更小的电容器,并且连接或者断开所述电容器,使有效电容被改变。 [0011] Common for adjusting capacitance of the capacitor is constructed in a manner that a plurality of smaller capacitor and the capacitor is connected or disconnected, the effective capacitance is changed. 图4Α和图4Β中给出示例,所述节点IN和大地之间具有可变电容C以及开关S的排列,如图所示其一端与大地连接,另一端与节点IN连接。 It is given in FIGS. 4Α and 4Β example, the node having a variable capacitance C arranged between the IN and a switch S and ground, as shown in FIG connected with the earth at one end, the other end is connected to node IN. 由于电路中的开关本身有寄生电容,开关SI的设置均有各自的优缺点,在这种情况下,整个电容值变小,寄生电容成为整个电容值的主要部分。 A switch in the circuit itself has a parasitic capacitance, switch SI respective advantages and disadvantages are provided, in this case, the overall capacitance value becomes smaller, the parasitic capacitance of a major part of the overall capacitance value. 由于电容数值很难控制,而开关S和电容器C串联,当开关闭合时,所述寄生电容和电容器电量之间的比例将决定电容量。 Since the capacitance value is difficult to control, and the capacitor C and switch S in series when the switch is closed, the ratio between the parasitic capacitance and the capacitor charge will determine the capacitance.

[0012] 对于电路中的电容器至少有一个节点被期望有高阻抗,因此该节点的电压依靠电容器的电容量以及被其他元件储存的电量,所述寄生电容将使电压变化,对于上述应用,电容器的两个节点处被储存在元件中的电量所驱动,且所述元件由于寄生电容的原因会发生改变。 [0012] For the capacitor circuit has at least one node is expected to have a high impedance, and therefore relies on the voltage of the node capacitance of a capacitor and other elements stored charge, the parasitic capacitance will cause the voltage change, for the above applications, the capacitor electricity at the two nodes is stored in the drive element, and the element due to parasitic capacitance will change. 为了克服上述这些不期望的由寄生电容带来的负面影响,下面将描述一种新的解决方法。 In order to overcome these undesirable negative effects caused by the parasitic capacitance, the following will describe a new solution.

发明内容 SUMMARY

[0013] 本发明所要解决的技术问题是如何提供一种可消除电路中寄生电容影响的电路>JU ρςα装直。 [0013] The present invention solves the technical problem is how to provide a circuit which can cancel the parasitic capacitance of the circuit influence> JU ρςα fitted straight.

[0014] 为了实现上述目的,本发明提供一种电路装置,其终端连接至由激励源激励的电路网络中,所述电路装置包括至少一个可控电源和至少一个电容器以及通过所述电容器连接所述终端与可控电源的方法,其中,所述可控电源的至少一个输出端的控制功能在所述终端或者激励源的电势参数范围。 [0014] To achieve the above object, the present invention provides a circuit arrangement, which terminal is connected to a network circuit energized by the excitation source, said circuit means comprises at least one controllable power source and the at least one capacitor and is connected through the capacitor method said controllable power source terminal, wherein said controllable power supply control function of at least one output terminal of the potential parameters of the terminal or excitation source.

[0015] 本发明还包括一种测量系统,所述测量系统包括测量物、激励源网络和控制回路,所述电路装置的终端连接至所述激励源网络,所述控制回路包括通过电路装置的连接点发送控制信号的方法,所述测量物改变所述激励源网络的电性,所述控制回路通过改变所述电路装置的电性基本补偿所述测量物在所述激励源网络的变化。 [0015] The present invention also includes a measuring system, the measuring system comprises a measuring object, an excitation source and a network control circuit, said circuit terminal apparatus connected to the network excitation source, said control circuit comprising a circuit by means of a connection point for sending control signals, changing the measurement was the source of electrical excitation of the network, said control circuit substantially compensating for the change by changing the electrical properties of the circuit arrangement was measured at the excitation source network.

[0016] 与现有技术相比,本发明所述电路装置,不但简单,而且由于所述装置是为了调节电容,为了内部电压源的使用,因此所述装置的内部节点被设定,从而消除了寄生元件的影响。 [0016] Compared with the prior art, the circuit arrangement of the present invention is not only simple, and because the means for adjusting the capacitance, in order to use the internal voltage source, the internal nodes of the device is set, thereby eliminating the effect of the parasitic element. 附图说明 BRIEF DESCRIPTION

[0017] 本发明是通过举例的方法,而不仅局限在所述的附图中,在附图中相关的数字对应相关的元素。 [0017] The present invention is by way of example, and not limited to the drawings, elements in the figures corresponding to the relevant digital-related.

[0018] 图1:利用三个电极的抽象平面图来表达的电桥示意图; [0018] Figure 1: a plan view of three electrodes using the Abstract expressed schematic bridge;

图2:根据图1所述的第一种电桥电路示意图; Figure 2: a first bridge circuit in accordance with the schematic diagram of FIG 1;

图3:根据图1所述的第二种电桥电路示意图; Figure 3: The second bridge circuit schematic according to FIG. 1;

图4Α:利用若干个电容器和开关相连的一种现有实施例; FIG 4Α: using a plurality of a prior embodiment of a capacitor and a switch connected;

图4Β:利用若干个电容器和开关相连的另一种现有实施例; FIG 4Β: using a plurality of another conventional embodiment of a capacitor and a switch connected;

图5:根据本发明所述电路装置的第一种应用实施例; Figure 5: According to a first embodiment of an application of the circuit arrangement according to the present invention;

图6:根据本发明所述电路装置的第二种应用实施例; Figure 6: According to a second embodiment of the circuit arrangement of the present invention;

图7:根据本发明所述第一种电路装置的连接示意图; Figure 7: connecting a first circuit arrangement according to the invention in a schematic view;

图8:根据本发明所述第二种电路装置的连接示意图; Figure 8: a second connector according to the present invention is a circuit schematic of the apparatus;

图9:根据本发明所述第三种电路装置的连接示意图。 Figure 9: a schematic view of a third connector according to the present invention, the circuit arrangement.

具体实施方式 detailed description

[0019] 为了更好的理解本发明,下面具体介绍若干实施例。 [0019] For a better understanding of the present invention, the following description of several specific embodiments. 显然,对于本领域技术人员在没有下列实施例的情况下,也能够实现本发明,为了避免不清楚,所以在一些实施例中,元器件以及线路连接关系以结构图的形式进行介绍。 Apparent to those skilled in the absence of the following examples, the present invention can be achieved, in order to avoid unclear, so in some embodiments, line components and connection relationship are described in the form of the structure of FIG.

[0020] 其中,文中提到的作为电容感应源的手指,是测量装置想要测量的对象,测量装置测量的对象通常认为是手指或者其他合适的物体,为了方便阅读,文中将“或者其它物体”省略。 [0020] wherein, as mentioned in the text of source finger capacitive sensing, the object is measured by the measuring means desired object measuring device is generally considered to be a finger or other suitable object, in order to facilitate reading in the text "or other objects "omitted.

[0021] 以图5和图6为例说明由于手指的触碰导致系统的不平衡是如何调节达到再次平衡,与图1相比增加了多个可变电容器C1X2X3X4X5和C6至感应电极电容器,以及手指感应产生的影响用Cutci和Cun表示,这样并不限定Cut的手指连接至哪个节点,测量时只有由于Cut的引入导致系统的不平衡是重要的,而与其增加或者减少是没有关系的。 [0021] In Figures 5 and 6 illustrate an example due to the finger touch on the cause of imbalance in the system is adjusted to balance again increased compared with FIG. 1 C1X2X3X4X5 plurality of variable capacitors C6 and a capacitor to the sensing electrode, and Effects induced by the finger and is represented by Cutci of Cun, this is not limited Cut which node is connected to the finger, only the measurement results in the introduction of an unbalanced Cut system is important, but there is no increase or decrease their relationship.

[0022] 具有电容桥的电量的测量在若干周期分两步进行。 [0022] The bridge has a capacitance measuring quantity of two steps in a number of cycles. [0023] 若使用MO的方式,第一步,所述节点Al、B1、Cl放电至大地,第二步,节点BI升高至高电平,例如系统的电源,如此以来,所述节点Al和Cl升高至基于连接至节点的电容器的数值的中间级。 [0023] When the MO manner, the first step, the node Al, B1, Cl is discharged to ground, the second step, the node BI rises to a high level, for example, a power supply system, so since the node and Al Cl raised to an intermediate level based on the value of the capacitor connected to the node. 若没有侦测到手指,由于系统平衡,节点Al和Cl将具有相同的电压;若侦测到手指,则所述节点Al和Cl具有不同的电压,现在修正一个或者多个可变电容器的数值,在新的测量周期中,所述节点Al和Cl之间的电压差已经改变,通过若干个周期改变可变电容器的电容值进而测量可变电容器的数值,这样可以使得节点Al和Cl之间的电压差回到零。 If the finger is not detected, since the balance of the system, the node Al and Cl will have the same voltage; if the detected finger, then the node Al and Cl have different voltages, now correct the value of one or more variable capacitors , in a new measurement cycle, the node voltage difference between Al and Cl have changed, and thus the measured value of the variable capacitor capacitance value of the variable capacitor is changed through several cycles, so Al can be made between the node and Cl the voltage difference back to zero.

[0024] 在第二步中,若所述节点Al和Cl有任何电压,所述电容桥均可工作,然而,当中间电压接近中间值时,敏感度的变化更高。 [0024] In the second step, if the node Al and Cl have any voltage, of the capacitor bridge can work, however, when the intermediate voltage is near the intermediate value, the higher sensitivity variation. 通过同时改变可变电容器C1和C2的电量,和/或同时改变可变电容器C3和C4的电量,同时改变相同可变电容器的数量,就可以调整中间电压的电平,通过仅改变一个电容器的电量,手指的影响可以得到补偿。 By simultaneously changing the amount of the variable capacitors C1 and C2, and / or while varying the variable power capacitors C3 and C4, the same while changing the number of the variable capacitor, you can adjust the level of the intermediate voltage, by changing only one capacitor effects of electricity, the finger can be compensated.

[0025] 若使用Ml的方法,第一步,所述节点A2充电至高电平,例如系统的电源,节点B2充电至参考电压,节点C2放电至大地;第二步,所述节点A2放电至接地电平,节点C2充电至与第一步中节点A2相同的高电平。 [0025] The use of a method Ml of the first step, the node A2 is charged to a high level, for example, a power supply system, the charging node to the reference voltage B2, C2 is discharged to ground node; a second step, the node A2 is discharged to ground level, and the node C2 is charged to the first step of the node A2 of the same high level. 如果没有侦测到手指,由于系统的平衡,所述节点B2将具有与第一步充电电压相同的电压;如果侦测到手指,所述节点B2的电压会发生变化,在若干个周期中,利用可变电容器C5和C6改变电容值,测量参考电压和节点B2之间的电压差,可以发现随可变电容器C5和C6的电量的变化,所述节点B2和参考电压之间的电压差可以回到零。 If the finger is not detected, due to the balance of the system, the node B2 will charge the first step having the same voltage; if the detected finger, the voltage at node B2 will change in several cycles, capacitors C5 and C6 by the variable capacitance values ​​change, measuring the voltage difference between the reference voltage and the node B2, can be found changes with the variable power capacitors C5 and C6, the node B2 and the voltage difference between the reference voltage may back to zero.

[0026] 通过上面的描述可以得知,通过若干个可控元器件影响高阻抗节点和低阻抗节点之间的关系,所述高阻抗节点的电压可以测量,同时高阻抗节点的电压也是给予低阻抗节点激励的结果。 [0026] can be learned from the above description, the influence the relationship between the high impedance node a low impedance node and controlled by a plurality of components, said high impedance node voltages can be measured, while the voltage of the high impedance node is given a low impedance node excitation results. 如此以来,低阻抗节点在两个步骤中保持稳定,或者所述低阻抗节点由第一步中低电平转为第二步中的高电平,或者是相反的情况。 By so doing, the low impedance node is stable in two steps, the low impedance node or from the first step in a low level in the second step into high reverse situation, or Yes.

[0027] 任何以合适的方式连接两个节点的电路均能以上述目的而工作,因为在第二个周期结束时进行测量,在系统达到一个新的稳定状态之后,在第一步过渡到第二步的过程中,电容器也同样如此,效果虽然并不理想,但是至第二步结束,结果是正确的,且可用的,因此在许多情况下可变电容器均被利用。 [0027] Any suitable circuitry to connect the two nodes can operate in the above-described object, as measured at the end of the second cycle, after the system reaches a new steady state, the first step in the transition to the second two-step process, the capacitor is also true, although the effect is not ideal, but the second step to the end, the result is correct, and available, and therefore the variable capacitor are utilized in many cases.

[0028] 所述可变电容器可以通过不同的方式获得,集成电路的许多应用都需要一个特定的元器件:变容二极管,该元器件是电压控制模拟可变电容器。 [0028] The variable capacitor may be obtained in different ways, many applications require a particular integrated circuit components: a varactor diode, the component is an analog voltage-controlled variable capacitor. 在调谐应用方面,变容二极管是很好的方案,应用于本发明中的测量功能,由于电容的数量及大小等因素,使其具有一定的限制性,使用线性电容器的其它方案,如金属-金属、金属-塑料、塑料-塑料等电容器或者晶体管栅极电容器,上述这些电容器可以具有较大的电容值,但是电容器电容值的改变只能通过增加或者减少电容器单元的方式实现,因此需要配备若干开关,而这类开关控制可变电容器正如图4A和图4B所示,且上述使用的开关均是单掷开关。 In the application of the tuning varactor diode is a good embodiment, the present invention is applied to measurements, since the number and size of the capacitor and other factors, it has a certain limitation, other schemes using linear capacitor, such as metal - metal, metal - plastic, plastic - like plastic capacitor or a transistor gate capacitors, these capacitors may have a larger capacitance value, but the change in capacitance value of the capacitor can only be achieved by increasing or decreasing manner capacitor unit, it is necessary with several switch, and such as the switching control of the variable capacitor shown in FIGS. 4A and 4B, and the switch used were single throw switch.

[0029] 半导体开关使用的是传输门电路,PMOS极和NMOS极并联且通过栅极逻辑信号控制,两个晶体管的源级是开关的一个接点,两个晶体管的漏极是开关的另一个接点,所有晶体管的漏极均是开关的另一个终端。 [0029] The use of the semiconductor switch is a transmission gate circuit, the PMOS and NMOS electrode and the gate electrode in parallel with a control logic signal, a source stage two transistors is a contact switch, the drains of the two transistors of the other contact of the switch , all transistors are drain terminals of another switch. 由于源级和漏极均是扩散区域,因此具有所有的寄生元件,包括寄生电容。 Since the source electrode and the drain diffusion regions are, therefore it has all of the parasitic elements, including parasitic capacitance. 对于电压源驱动的任何节点,所述寄生元件都不会影响测量结果,而对于高阻抗的节点,寄生元件使得系统更加复杂。 For any node driving voltage source, the parasitic element will not affect the measurement results, and for the high impedance node, such that the parasitic element system more complicated.

[0030] 由于上述这种寄生电容一般存在于开关电路,在集成电路设计中,开关是由晶体管组成的,这些晶体管的一端连接至电容器,另一端连接至不同的节点。 [0030] Because of the above such parasitic capacitance is generally present in the switch circuit in the integrated circuit design, the switch is composed of a transistor, the transistor is connected to one end of a capacitor, the other terminal connected to a different node. 连接点既可以是晶体管的栅极也可以是晶体管的源级,连接点包括原则上二极管呈反向连接的半导体区域,这些二极管总是具有非线性电容特性,当开关打开的时候,意味着晶体管不导电,电容器和其寄生电容仍然连接在晶体管的一侧。 The point of attachment can be either the gate of the transistor may be a source of a transistor stage, including the point of attachment principle diodes are semiconductor regions reverse-connected, which always has a nonlinear capacitance diode characteristics, when the switch is ON, the transistor means non-conductive, capacitor and parasitic capacitance of the transistor remains coupled on one side.

[0031] 为了克服寄生元件的消极影响,下面提供一种新的解决方法,本发明采用多控开关取代上述的单掷开关,这些多控开关连接至电容器的一个节点或者另一个节点上。 [0031] In order to overcome the negative effects of the parasitic elements, the following provides a new solution, the present invention instead of the multi-switch single throw switch, which is connected to the multi-switch node on a capacitor or another node. 在所有情况下,开关中的一路可驱动,且通过驱动电容器的节点使寄生电容消除。 In all cases, the switches can be driven all the way, driving the node by a capacitor and parasitic capacitance eliminated. 由于电容器通常连接至高阻抗节点,任何被转变的电容器由电源驱动,而该电源的电压与高阻抗节点电压相关,且必须由与高阻抗节点电压相关的电源驱动。 Since the capacitor is usually connected to a high impedance node, any capacitor is driven by a power supply transition, and the voltage of the power supply voltage associated with the high impedance node, and must be driven by a power source associated with the high impedance node voltage. 为了实现这个目的,需要使用可控的电源,所述可控电源具有至少一个输入端为高阻抗节点,且输出端通过开关以及电容器与高阻抗节点相连接。 To achieve this, it is necessary to use a controllable power supply, said controllable power supply having at least one input is a high impedance node, and an output terminal through a switch and a capacitor connected to the high impedance node. 这种解决方案可以建立一种电路装置,其输入值甚至可以是负值,所述电路装置的建立能够有效消除寄生电容的影响。 This solution may be the establishment of a circuit arrangement, which may even be negative input values, establishing the circuit arrangement can effectively eliminate the influence of parasitic capacitance.

[0032] 本发明所述的电路装置,通过连接或者断开所述电容器,使有效电容被改变,其包括至少一个可控电源和至少一个电容器,其终端连接至由激励源激励的电路网络中,通过所述电容器可将可控电源连接至终端,由于电容器通常连接至高阻抗节点,因此所述可控电源的至少一个输出端的控制功能在所述终端或者激励源的电势参数范围内。 [0032] The circuit arrangement according to the present invention, the capacitor is connected or disconnected, the effective capacitance is changed, which comprises at least one controllable power source and the at least one capacitor, which terminal is connected to a network circuit energized by the excitation source , may be connected to a controllable power source terminal through the capacitor, the potential of the capacitor parameters typically connected to a high impedance node, the control function of the controllable power supply at least one output terminal or the excitation source.

[0033] 本发明一个简单实施例由可控电压源和一个电容器组成的电路装置,所述电路装置的终端Out连接至由激励源激励的电路网络中,所述可控电压源与电容器相连接后连接至终端Out,由于高阻抗节点的电压变化会导致电容器电荷的变化,而电容器电荷的改变量AQ与电压随电容的变化量的关系如下:AQ=CAVc, [0033] The device consists of a controllable voltage source circuit and a simple embodiment of a capacitor according to the present invention, Out terminal of the circuit arrangement connected to a circuit network excited by the excitation source, the controllable voltage source is connected to the capacitor after connecting to the terminal Out, the voltage change of the high impedance node causes a change of charge of the capacitor, and the change amount of the voltage of the capacitor charge AQ variation in capacitance with the following relationship: AQ = CAVc,

如果AVin是高阻抗节点IN的电压改变量,C是连接至IN的电容器C1的电容量,电容器的另一端连接至恒定电压,我们可以对电容器电荷的变量AQ进行计算。 If the voltage change amount is AVin high impedance node IN, C is the capacitance of the capacitor C1 is connected to the IN, and the other end of the capacitor is connected to a constant voltage, we can charge the capacitor AQ calculated variables.

[0034] AQ=CAVin [0034] AQ = CAVin

如果电容器的另一端连接至可控电压源,节点变化用AVskc表示,电压随电容器的改变量AVc是不同的。 If the other end of the capacitor is connected to a controllable voltage source, represented by the node changes AVskc, with the amount of change in capacitor voltage AVc are different.

[0035] AVc = AVin - AVsec [0035] AVc = AVin - AVsec

电荷量的改变是:AQ = C (AVin - AVsec)。 Changing the amount of charge is: AQ = C (AVin - AVsec).

[0036] 如果可控电压源的电压是Vin的α倍,我们可以改写为: [0036] If the voltage controllable voltage source Vin is α times, we can be rewritten as:

AQ = C (1- a ) AVin = (1- a ) C AVino AQ = C (1- a) AVin = (1- a) C AVino

[0037] 在特殊情况下,可控电压源可以是电压跟随器,且数值α =1,此时结果是: [0037] In special cases, controllable voltage source may be a voltage follower, and the value α = 1, this time the result is:

AQ = C (1-1) AVin =0 AQ = C (1-1) AVin = 0

电荷改变量和电压改变量的关系可以通过选择可控电压源的参数从饱和值到O值进行修改。 Relationship between change amount of charge and the voltage change amount from the saturation value can be modified by selecting the value of O to controllable voltage source parameters.

[0038] 本发明的另一种实施例,建立一种电路装置,其通过一组电容器的使用而实现、包括不同的电容值,双掷开关和可控电压源或者电压跟随器。 [0038] another embodiment, the establishment of a circuit arrangement, which is achieved by using a bank of capacitors, including capacitors of different values, double-throw switches and the controllable voltage source or voltage follower to the present invention. 在这种情况下,每个电容器可连接至恒定电压如接地或者可控电压源或者电压跟随器上,所述一组或者所有的电容器,在所述控制信号的控制下,可连接至所述两个可控电源中的任意一个,所述至少一个可控电源被相同的控制信号控制。 In this case, each capacitor may be connected to a constant voltage such as the ground or a controllable voltage source or voltage follower, or the set of all of the capacitors, under control of the control signals, may be connected to the any two of a controllable power source, said at least one power control signal is the same controllable. 若电容器连接至电压跟随器,两端之间不会存在电压差,因此从应用端看的话,没有增加有效电容;若电容器连接至可控电压源,两端之间存在一定的电压差,故从应用端来看就增加了部分有效电容。 If the capacitor is connected to a voltage follower, a voltage difference does not exist between the two ends, so to see if the end of the application, without increasing the effective capacitance; if the capacitor is connected to a controllable voltage source, is present between both ends of the constant voltage difference, so from the view of the application side portion increases the effective capacitance. 所述电路装置还包括信号控制端TC,其中,所述信号控制端设有控制连接点,且一个控制信号通过所述控制连接点能够改变至少一个所述可控电源的控制功能和或改变所述电容器的连接。 Said circuit means further comprises a control signal terminal TC, wherein said signal is provided with a control terminal connected to a control point and a control signal through the control connection control function capable of changing at least one of the controllable power supply and the change or said capacitor is connected.

[0039] 所述控制连接点可分成信号载体组,每个信号载体组携带一个控制信号,所述至少一个信号载体组构成一组信号载体,所述信号载体携带数字控制信号,为了每个单独的信号载体携带有限数量状态的信号,所述信号载体组中所有状态的结合代表所述数字信号,流过所述终端的电荷总量与所述数字控制信号成比例。 [0039] The point of attachment may be divided into a control signal carrier groups, each group carries a control signal carrier signal, the carrier signal is at least one group constituting a group of carrier signals, the carrier signal carrying a digital control signal, for each individual signal vector carries a limited number of states of a signal vector representing the set of digital signal in conjunction with all states, flows through the terminal and the total amount of charge is proportional to the digital control signal. 所述控制信号可以选择功能,控制至少一所述可控电源的输出,通过命令功能列表使一个整数值可指示所述功能在功能列表中的位置,其中所述可控电源的输出电压命令所述功能列表,所述控制连接点可以选择控制至少两个所述可控电源输出的功能,且所述功能与整数对应,不同的功能对应不同的整数。 The function selection control signal may control the output of said at least one controllable power source by a command to make a list of integer values ​​may indicate that the functional position in the function list, wherein said controllable power supply output voltage command said function list, said at least two control connection of the controllable power control function output may be selected, and the function corresponding to an integer, different functions corresponding to different integers.

[0040] 本发明的另一种具体实施例如图7所示,所述电路装置由两个可控电压源、具有不同电容值的电容器组以及双掷开关构成,其中电路装置的终端Out为高阻抗节点,其连接至由激励源激励的电路网路;所述电容器的一端连接至所述终端Out,其另一端连接至所述可控电压源,所述电容器与可控电压源通过双掷开关S连接,且所述双掷开关S的一个输入端连接可控电压源输出的高电平,其另一个输入端连接至另一个可控电压源输出的低电平。 [0040] Another specific embodiment of the present invention is as shown in Figure 7, the circuit arrangement consisting of two controllable voltage source, the capacitor bank and the double-throw switch having a configuration different capacitance values, where the circuit arrangement Out terminal is high impedance node connected to the network circuit energized by the excitation source; end of the capacitor is connected to the terminal Out, and the other end connected to the controllable voltage source, the capacitor is controllable voltage source by the double-throw switch S is connected, and the input terminal of a double-throw switch S is connected to the output of the high-level controllable voltage source, the other input terminal is connected to the low level output of the other controllable voltage source. 所述激励源与可控电压源相连,且所述双掷开关S与电容C连接后又输出至上述可控电压源,所述可控电压源的至少一个输出端的控制功能在所述终端Out或者激励源的电势参数范围内,所述控制信号通过所述信号控制端TC的连接点能够改变至少一个所述可控电源的控制功能和或改变所述电容器的连接。 The excitation source with a controllable voltage source, and the double-throw switch S is connected to the capacitor C and then outputted to the above-described controllable voltage source, the controllable voltage source to at least one control function of the output of the terminal Out the excitation source or potential parameters, the control signal terminal TC can be varied to control the connection point of said at least one controllable power supply and a connection control function or alter the signal through the capacitor.

[0041] 上述这种实施例中,一个或者另一个可控电压源通过开关S与电容器C相连,两个可控电压源的区间可以设置,并且通过开关S使得该电路装置在上述区间内也可设置,通过连接或者断开所述电容器,使有效电容被改变。 [0041] Such above-described embodiments, one or other controllable voltage source via a switch S is connected to the capacitor C, zone two controllable voltage source may be provided, and by the switch S so that the circuit arrangement is also within the above range may be provided by connecting or disconnecting the capacitor, the effective capacitance is changed. 本发明的再一个具体实施例如图8所示,所述电路装置由一个电压跟随器、具有不同电容值的电容器C组以及双掷开关S构成,与实施例图7不同的是:所述双掷开关C的一个输入端连接电压跟随器输出的高电平,其另一个输入端均接地。 A further particular embodiment of the present invention, for example, as shown in FIG. 8, said circuit means comprises a voltage follower, the capacitor having a different capacitance values ​​of group C and the double-throw switch S configuration, different from the embodiment of FIG 7 is: a bis high-throw switch C is connected to one input terminal of the voltage follower output, whose other input terminal grounded.

[0042] 本发明的又一具体实施例如图9所示,所述一个可控电源包括电压跟随器、至少在电阻端部具有节点的若干电阻R和开关网络SR,所述电压跟随器的一个输入端连接至所述终端,所述若干电阻R的一端由所述电压跟随器的输出驱动,所述开关网络SR在所述控制连接点的控制下选择一个节点作为可控电源的输出。 [0042] A further particular embodiment of the present invention is as shown in Figure 9, the controllable power source includes a voltage follower, at least a plurality of resistors R and a switch in the network node resistor SR has an end portion, one of said voltage follower an input terminal connected to the terminal end of the plurality of resistor R is driven by the output of the voltage follower, said switching network to select a node SR as a controllable power source under control of the output control connection point. 与实施例图7不同的是:其中一个所述可控电压源是由一个电压跟随器和一个复杂路径代替,该路径具有多个单掷开关S,通过选择一个电阻节点分别连接到电容C节点上,所述若干电阻R的另一端可通过恒压、激励源或者至少一可控电源驱动。 Different from the embodiment of FIG 7 is: wherein one of the controllable voltage source is replaced by a voltage follower and a complex path, this path having a plurality of single-throw switch S, a capacitor C is connected to the nodes by selecting a resistor node, respectively the other end of the resistor R may be prepared by a number of constant pressure, or at least a controllable source of excitation power driver. 所述可控电源的输出控制功能中,包括激励源、信号控制端等若干参数。 The controllable output power control function, the number of parameters including an excitation source, the control signal terminal and the like.

[0043] 在上述实施例中,仅有一个可控电压源是由电压跟随器、若干电阻以及开关网络组成,由于原理相同,也可以将另一个可控电压源同样用电压跟随器等原件代替,即至少两个可控电源包括至少一个电压跟随器、至少一电阻端部具有节点的若干电阻和开关网络,所述电压跟随器的一个输入端连接至所述终端,所述若干电阻的一端由所述电压跟随器的输出驱动,所述开关网络在控制连接点的控制下选择一个节点作为一个所述可控电源的输出以及所述节点中的一个作为另一个所述可控电源的输出,由于可以延伸出若干个电路图,所以这里不再逐个详细介绍。 [0043] In the above embodiment, only a controllable voltage source is a voltage follower composed of a plurality of resistors and a switch network, because the same principles, may be replaced by a further controllable voltage source with the same original voltage follower etc. , i.e., at least two controllable power source comprises at least a voltage follower, the at least one resistor end portion having a plurality of resistors and a switching network node, an input terminal of the voltage follower are connected to the terminal end of said plurality of resistors driven by the output of the voltage follower, the switching network of the selected node as a controllable output power source node and said one other of said controllable power source as controlled by the control output connection points Since a number may extend a circuit diagram, so this is no longer described in detail one by one.

[0044] 本发明中,由于参考电压的使用如接地并不是必须的,因此基于同样的原理,若低阻抗节点是可变电压节点,在高阻抗节点IN和低阻抗节点如接地之间,连接所述电路装置也能工作。 [0044] In the present invention, since the reference voltage as the ground is not required, so the same principle, when the low impedance node is a variable voltage node, the high impedance node, such as between a ground and a low impedance node IN connected the circuit arrangement can work. 请参考上述实施例的图5和图6,它可以替代位于地和节点Al或者Cl之间的可变电容器C3和C4,但是通过可变节点替代接地节点,同样对于方法MO中的节点BI或者方法Ml中的节点A2、节点C2,可变电容器Cp C2、C5和C6均可由所述电路装置替代。 Please refer to the above-described embodiment of FIGS. 5 and 6, it may alternatively be a variable capacitor and a node located between the Al or Cl C3 and C4, but instead the ground node by the variable nodes, the nodes also for the MO method or BI a method Ml of the node A2, and node C2, the variable capacitor Cp C2, C5 and C6 may be replaced by said circuit means.

[0045] 理论上,电压跟随器的使用必然包含跟随器的输出等于跟随器的输入,只有电流驱动电路与输入是独立的,然而在实际应用中,所述跟随器会有偏差,所述偏差使得输入和输出之间存在电压差。 [0045] In theory, the output of the voltage follower comprising a follower necessarily equal to follow the input device, the input only the current drive circuit are independent, but in practical applications, the follower will be biased, the bias that exists between the input and output voltage difference. 对于电压跟随器的使用,通过开关使电容器连接至跟随器上,将不会得到理想的结果,由于电容器上仍然存在电压差,这个差值将使得所述电路装置受到很大的影响,特别是对于小数值的装置,如果一个桥中使用两个所述电路装置,由于每个均有它们自身的偏差,从而会造成很大的错误。 For a voltage follower by a switch on the capacitor is connected to the follower, you will not get the desired results, since the difference between the capacitor voltage persists, this difference means that the circuit will be greatly affected, especially for small values ​​of the apparatus, if a bridge circuit using the two devices, since each with their own bias, which will cause great errors. 然而当应用在电桥电路中时,最初的平衡并不依赖于元件的绝对值,由于原始电桥平衡是在没有如手指等外界触碰情况下获得的,同时电压的数值在所述电路装置中设置有最大值,因此在这种构造下,可变电容电路的内部电容具有最大的电压,因此小的偏差几乎没有影响。 However, when applied in a bridge circuit, the first balance element does not depend on the absolute value, since the original bridge balance under external finger without touching the like is obtained, while the magnitude of the voltage of the circuit arrangement the maximum value is provided, so that in this configuration, the internal capacitance of the variable capacitance circuit having the highest voltage, and therefore have little effect small deviations. 而对于最初的平衡,为了补偿电容桥中类似手指触碰后电容值的影响,所述电路装置的数值改变,且其数值会减小,在这种情况下,数值减少的总量与手指触碰后所产生的电容值相应。 For the initial balance, in order to compensate for the capacitance bridge similarly affected after finger touch capacitance value, changing the value of the circuit arrangement, and its value will be reduced, in this case, reducing the value of the total amount of touch of the finger the capacitance value corresponding to the generated collision.

[0046] 本发明中,所述电容组的电容值根据等级设置,其中所述第一个电容具有单元电容值,且每下一个电容所具有的电容值等于其前面所述电容的电容值总和。 The sum of the capacitance value of the [0046] present invention, the capacitance value of the capacitor bank according to the setting level, wherein said first capacitor means having a capacitance value, and each of the next value of the capacitance has a capacitance equal to the capacitance of the front . 本发明所有实施例中均已可控电源是可控电压源为例说明,但不限于该实施例,任何能够通过连接或者断开所述电容器,使有效电容被改变的电路装置均在本发明的保护范围内。 All embodiments of the present invention have a controllable power source is a controllable voltage source as an example, but not limited to this embodiment, any connected or disconnected through the capacitor, the effective capacitance of the circuit means is changed in the present invention are within the scope of protection.

[0047] 本发明还包括一种由所述电路装置的构成的测量系统,所述测量系统包括测量物、激励源网络和控制回路,所述电路装置的终端连接至所述激励源网络,所述控制回路包括通过电路装置的连接点发送控制信号的方法,所述测量物改变所述激励源网络的电性,所述控制回路通过改变所述电路装置的电性基本补偿所述测量物在所述激励源网络的变化。 [0047] The present invention also includes a system configured by a measurement of the circuit arrangement, the measuring system includes a measuring terminal was network excitation source and a control circuit, said circuit means connected to the excitation source network, the said control circuit comprises a method of transmitting a control signal via a connection point of the circuit arrangement, the change of the measurement target energization of the source network, the control loop by varying the electrical circuit means substantially compensating the measurement was the excitation source network changes.

Claims (25)

  1. 1.一种电路装置,其终端连接至由激励源激励的电路网络中,其特征在于:所述电路装置包括至少一个可控电源和至少一个电容器以及通过所述电容器连接所述终端与可控电源的方法,其中,所述可控电源的至少一个输出端的控制功能在所述终端或者激励源的电势参数范围内。 A circuit arrangement, which terminal is connected to a network circuit energized by the excitation source, characterized in that: said circuit means comprises at least one controllable power source and the at least one capacitor and is connected through the terminal and the capacitor a controllable the method of the power supply, wherein the controllable power control function of at least one output terminal within the terminal potential parameters or excitation source.
  2. 2.如权利要求1所述的电路装置,其特征在于:所述至少一个可控电源的控制功能在所述激励源的限制范围内。 2. The circuit device according to claim 1, wherein: said at least one controllable power control function within the limits of the excitation source.
  3. 3.如权利要求1所述的电路装置,其特征在于:所述电路装置还包括设有控制连接点的信号控制端,其中,一个控制信号通过所述控制连接点能够改变至少一个所述可控电源的控制功能和或改变所述电容器的连接。 3. The circuit device according to claim 1, wherein: said circuit means further comprises a control terminal is provided with a control signal connection point, wherein a control signal through the control connection may be capable of changing at least one of control function and controls the power source or changing the connection of the capacitor.
  4. 4.如权利要求1所述的电路装置,其特征在于:所述终端的电势改变通过改变可控电源的控制功能和或改变电容器的连接。 4. The circuit device according to claim 1, wherein: said potential terminal is changed by changing the control function of the controllable power source and the capacitor or changing the connection.
  5. 5.如权利要求1所述的电路装置,其特征在于:所述电容器的一端连接至所述终端。 5. The circuit device according to claim 1, wherein: one end of the capacitor is connected to the terminal.
  6. 6.如权利要求1或5所述的电路装置,其特征在于:所述电容器的另一端连接至所述可控电源。 6. The circuit arrangement of claim 1 or claim 5, wherein: the other end of the capacitor is connected to the controllable power source.
  7. 7.如权利要求3所述的电路装置,其特征在于:所述电容器在所述控制信号的控制下,可以与所述可控电源中的一个断开而连接至另一个可控电源上。 7. The circuit device according to claim 3, wherein: said capacitor under control of the control signal, the controllable power source can be disconnected from one another is connected to the controllable power source.
  8. 8.如权利要求3所述的电路装置,其特征在于:所述控制信号可以选择功能,控制至少一所述可控电源的输出,通过命令功能列表使一个整数值可指示所述功能在功能列表中的位置。 Functions in the function selection function of the control signal may control the output of said at least one controllable power source by a command to make a list of the integer value may indicate that: The circuit arrangement as claimed in claim 3, characterized in that position in the lists.
  9. 9.如权利要求8所述的电路装置,其特征在于:所述可控电源的输出电压命令所述功能列表。 9. The circuit device according to claim 8, wherein: said controllable power supply output voltage command of the function list.
  10. 10.如权利要求8所述的电路装置,其特征在于:所述控制连接点可以选择控制至少两个所述可控电源输出的功能,且所述功能与整数对应,不同的功能对应不同的整数。 10. The circuit device according to claim 8, wherein: said control connection point of said at least two controllable power control function output may be selected, and the function corresponding to an integer, different functions corresponding to different integer.
  11. 11.如权利要求3所述的电路装置,其特征在于:至少一个所述可控电源包括跟随器、至少在电阻端部具有节点的若干电阻和开关网络,所述跟随器的一个输入端连接至所述终端,所述若干电阻的一端由所述跟随器的输出驱动,所述开关网络在所述控制连接点的控制下选择一个节点作为可控电源的输出。 11. The circuit device according to claim 3, wherein: said at least one controllable power source follower comprises at least a resistor and a switch having a plurality of network nodes in the resistor ends, followed by an input terminal connected to said filter to the terminal, one end of the plurality of resistors is driven by the output of said follower, said switching network to select a node as a controllable output power source under control of the control point of attachment.
  12. 12.如权利要求3所述的电路装置,其特征在于:所述至少两个可控电源包括至少一个跟随器、至少一电阻端部具有节点的若干电阻和开关网络,所述跟随器的一个输入端连接至所述终端,所述若干电阻的一端由所述跟随器的输出驱动,所述开关网络在控制连接点的控制下选择一个节点作为一个所述可控电源的输出以及所述节点中的一个作为另一个所述可控电源的输出。 12. The circuit device according to claim 3, wherein: said at least two controllable power source comprises at least one follower, the end portion having at least a plurality of resistors resistor and a switching network node, the follower a an input terminal connected to the terminal end of the plurality of resistors is driven by the output of said follower, said network selection switch under control of the control point is connected to a node as an output of the controllable power source node and said as another one of the output of the controllable power.
  13. 13.如权利要求11或12所述的电路装置,其特征在于:所述若干电阻的另一端通过恒压驱动。 13. The circuit device of claim 11 or claim 12, wherein: the other end of said plurality of resistors driven by a constant voltage.
  14. 14.如权利要求11或12所述的电路装置,其特征在于:所述若干电阻的另一端通过所述激励源驱动。 14. The circuit device of claim 11 or claim 12, wherein: the other end of said plurality of resistors driven by the excitation source.
  15. 15.如权利要求11或12所述的电路装置,其特征在于:所述若干电阻的另一端通过至少一可控电源驱动。 15. The circuit device of claim 11 or claim 12, wherein: said plurality of other end of the resistor is driven by at least one controllable power source.
  16. 16.如权利要求11或12所述的电路装置,其特征在于:所述可控电源的输出控制功能中,至少所述激励源作为一个参数。 16. The circuit device of claim 11 or claim 12, wherein: said controllable power supply output control function, at least the excitation source as a parameter.
  17. 17.如权利要求1所述的电路装置,其特征在于:所述电容组的电容值根据等级设置,其中所述第一个电容具有单元电容值,且每下一个电容所具有的电容值等于其前面所述电容的电容值总和。 17. The circuit device according to claim 1, wherein: a capacitance value of the capacitor bank according to the setting level, wherein said first capacitor means having a capacitance value, and the next capacitor having a capacitance value of each of the equal the front sum of the capacitance of the capacitor.
  18. 18.如权利要求3所述的电路装置,其特征在于:所述一组或者所有的电容器,在所述控制信号的控制下,可连接至所述两个可控电源中的任意一个。 18. The circuit device according to claim 3, wherein: the set of all of the capacitors or, under control of the control signals, may be connected to the two power supply of any one controllable.
  19. 19.如权利要求3所述的电路装置,其特征在于:所述至少一个可控电源被相同的控制信号控制。 19. The circuit device according to claim 3, wherein: said at least one controllable power source by the same control signal.
  20. 20.如权利要求3所述的电路装置,其特征在于:所述控制连接点可分成信号载体组,每个信号载体组携带一个控制信号。 20. The circuit device according to claim 3, wherein: the control connection may be divided into signal carrier groups, each group carries a control signal carrier signal.
  21. 21.如权利要求20所述的电路装置,其特征在于:所述至少一个信号载体组构成一组信号载体,所述信号载体携带数字控制信号,为了每个单独的信号载体携带有限数量状态的信号,所述信号载体组中所有状态的结合代表所述数字信号。 21. The circuit arrangement according to claim 20, wherein: said at least one carrier signal group consisting of a group of carrier signals, the carrier signal carrying a digital control signal, for each individual carrier signals carry a limited number of states signal, the carrier signal group representing said digital signal in conjunction with all states.
  22. 22.如权利要求21所述的电路装置,其特征在于:所述数字控制信号与流过所述终端的电荷总量成比例。 22. The circuit device according to claim 21, wherein: said digital control signal and the amount of charge flowing through the proportional terminal.
  23. 23.如权利要求3所述的电路装置,其特征在于:所述终端的信号响应可以通过控制信号补偿。 23. The circuit arrangement according to claim 3, wherein: the terminal response signal may be compensated by the control signal.
  24. 24.如权利要求1至4中任意一个所述的电路装置,其特征在于:所述可控电源是电压电源。 24. The circuit arrangement 1 to 4 of any one of the preceding claims, characterized in that: said power source is a controllable voltage supply.
  25. 25.一种包含权利要求1至4中任意一个电路装置的测量系统,所述测量系统包括测量物、激励源网络和控制回路,其特征在于:所述电路装置的终端连接至所述激励源网络,所述控制回路包括通过电路装置的连接点发送控制信号的方法,所述测量物改变所述激励源网络的电性,所述控制回路通过改变所述电路装置的电性基本补偿所述测量物在所述激励源网络的变化。 25. A method as claimed in claim 1 comprising 4 to a measuring system of any of the circuit arrangement, the measuring system comprises a measuring object, an excitation source and a network control circuit, wherein: the terminal of the circuit means connected to the excitation source network, said control circuitry comprises a method of transmitting a control signal via a connection point of the circuit arrangement, the change of the measurement target energization of the source network, a control loop by changing the electrical circuit arrangement of said compensating substantially excitation was measured change in the source network.
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CN101930317A (en) * 2009-06-18 2010-12-29 株式会社和冠 Indication body detection device and indication body detection method
CN102033166A (en) * 2009-09-25 2011-04-27 爱特梅尔公司 Method and apparatus to measure self-capacitance using single pin
CN102187307A (en) * 2008-11-14 2011-09-14 夏普株式会社 Capacitance change-detecting circuit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87201131U (en) * 1987-03-20 1987-12-31 上海市计量技术研究所 Variable active three-terminal capacitance and loss standard
WO2009016382A2 (en) * 2007-07-31 2009-02-05 Qrg Limited Sensor and method of sensing
CN102187307A (en) * 2008-11-14 2011-09-14 夏普株式会社 Capacitance change-detecting circuit
CN101930317A (en) * 2009-06-18 2010-12-29 株式会社和冠 Indication body detection device and indication body detection method
CN102033166A (en) * 2009-09-25 2011-04-27 爱特梅尔公司 Method and apparatus to measure self-capacitance using single pin

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