CN109976565B - 用于处理来自触控面板的感测信号的信号处理电路 - Google Patents
用于处理来自触控面板的感测信号的信号处理电路 Download PDFInfo
- Publication number
- CN109976565B CN109976565B CN201810182941.XA CN201810182941A CN109976565B CN 109976565 B CN109976565 B CN 109976565B CN 201810182941 A CN201810182941 A CN 201810182941A CN 109976565 B CN109976565 B CN 109976565B
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- voltage signal
- comb filter
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03547—Touch pads, in which fingers can move on a surface
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
- H03M3/30—Delta-sigma modulation
- H03M3/39—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators
- H03M3/392—Arrangements for selecting among plural operation modes, e.g. for multi-standard operation
- H03M3/396—Arrangements for selecting among plural operation modes, e.g. for multi-standard operation among different frequency bands
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
- H03M3/30—Delta-sigma modulation
- H03M3/39—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators
- H03M3/412—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators characterised by the number of quantisers and their type and resolution
- H03M3/422—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
- H03M3/30—Delta-sigma modulation
- H03M3/39—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators
- H03M3/436—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators characterised by the order of the loop filter, e.g. error feedback type
- H03M3/438—Structural details of delta-sigma modulators, e.g. incremental delta-sigma modulators characterised by the order of the loop filter, e.g. error feedback type the modulator having a higher order loop filter in the feedforward path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
- H03M3/30—Delta-sigma modulation
- H03M3/458—Analogue/digital converters using delta-sigma modulation as an intermediate step
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
本发明提供一种用于处理来自触控面板的感测信号的信号处理电路。所述信号处理电路包括模拟前端电路及滤波电路。所述模拟前端电路被配置成从触控面板接收感测信号并对所述感测信号执行信号捕获操作以输出电流信号。所述滤波电路耦合到所述模拟前端电路。所述滤波电路被配置成从所述模拟前端电路接收所述电流信号并对所述电流信号执行信号滤波操作以输出第一电压信号。所述滤波电路包括串联耦合的反混叠滤波器与梳齿滤波器。
Description
技术领域
本发明涉及一种信号处理电路,具体来说涉及一种用于处理来自触控面板的感测信号的信号处理电路。
背景技术
在这个信息时代中,对电子产品的依赖与日俱增。包括笔记本式计算机、移动电话、个人数字助理(personal digital assistant,PDA)、数字随声听等在内的电子产品是我们日常生活中所不可或缺的。前述电子产品中的每一个均具有供用户输入指令的输入界面,以使得所述电子产品中的每一个的内部系统自发地运行所述指令。在这个当前阶段,最常见的输入界面包括键盘及鼠标。
从用户的角度来看,使用包括键盘及鼠标在内的传统输入界面有时是相当不便的。为解决所述问题,制造商开始为电子产品配备例如触控面板等触控输入界面来取代传统的键盘及鼠标。当前,用户的指令通常是通过物理接触或感测用户的手指或手写笔(stylus)与触控输入界面之间的关系而提供到电子产品。
因此,在触控设备中,用于处理来自触控面板的感测信号的信号处理电路是必不可少的。
发明内容
因此,本发明涉及一种用于处理来自触控面板的感测信号的信号处理电路。
本发明的示例性实施例提供一种信号处理电路。所述信号处理电路包括模拟前端(analog-front-end,AFE)电路及滤波电路。所述模拟前端电路被配置成从触控面板接收感测信号并对所述感测信号执行信号捕获操作以输出电流信号。所述滤波电路耦合到所述模拟前端电路。所述滤波电路被配置成从所述模拟前端电路接收所述电流信号并对所述电流信号执行信号滤波操作以输出第一电压信号。所述滤波电路包括串联耦合的反混叠滤波器(anti-aliasingfilter,AAF)与梳齿滤波器(comb filter)。
在本发明的示例性实施例中,所述反混叠滤波器接收所述电流信号并提供预设带宽。所述反混叠滤波器基于所述预设带宽对所述电流信号进行滤波以向所述梳齿滤波器输出第二电压信号。
在本发明的示例性实施例中,所述梳齿滤波器串联耦合到所述反混叠滤波器。所述梳齿滤波器从所述反混叠滤波器接收所述第二电压信号。所述梳齿滤波器基于第一操作频率来进行操作并对所述第二电压信号进行滤波以输出所述第一电压信号。
在本发明的示例性实施例中,所述信号处理电路还包括模拟-数字转换器(analog-to-digital converter,ADC)。所述模拟-数字转换器耦合到所述梳齿滤波器。所述模拟-数字转换器被配置成接收所述第一电压信号并基于所述第一操作频率将模拟格式的所述第一电压信号转换成数字格式的所述第一电压信号。
在本发明的示例性实施例中,所述信号处理电路还包括下采样电路(down-sampling circuit)。所述下采样电路耦合到所述梳齿滤波器。所述下采样电路被配置成接收所述第一电压信号并对所述第一电压信号执行下采样操作以输出第三电压信号。
在本发明的示例性实施例中,所述信号处理电路还包括模拟-数字转换器。所述模拟-数字转换器耦合到所述下采样电路。所述模拟-数字转换器被配置成接收所述第三电压信号并基于第二操作频率将模拟格式的所述第三电压信号转换成数字格式的所述第三电压信号。所述第二操作频率小于所述第一操作频率。
在本发明的示例性实施例中,所述模拟前端电路包括运算放大器电路及电流镜电路。所述电流镜电路对所述运算放大器电路的操作电流进行镜像以产生所述电流信号。
在本发明的示例性实施例中,所述梳齿滤波器选自一阶梳齿滤波器、二阶梳齿滤波器、及四阶梳齿滤波器中的一个。
在本发明的示例性实施例中,所述触控面板选自电容触控面板(self-capacitance touch panel)及互电容触控面板(mutual-capacitance touchpanel)中的一个。
为使本公开的以上特征及优点更易于理解,以下详细阐述附有图的若干实施例。
附图说明
包括附图是为了提供对本发明的进一步理解,且所述附图并入本说明书中且构成本说明书的一部分。各附图示出本发明的实施例且与说明一起用于阐释本发明的原理。
图1示出根据本发明实施例的触控感测设备的方块图。
图2示出图1中所绘示信号处理电路的方块图。
图3示出图2中所绘示模拟前端电路及反混叠滤波器的电路图。
图4示出图2中所绘示梳齿滤波器的电路图。
图5示出图2中所绘示滤波电路120的滤波带形图。
图6示出根据本发明另一实施例的信号处理电路的方块图。
[符号的说明]
10:触控感测设备
100、300:信号处理电路
110:模拟前端电路
112、116、118:运算放大器电路
114:电流镜电路
120:滤波电路
122:反混叠滤波器
124:梳齿滤波器
130:模拟-数字转换器
200:触控面板
340:下采样电路
A:系数
AI:电流信号
C、C1、C2:电容器
CF:电容器/反馈电容器
CS:电容器/采样电容器
FC:中心频率
FS:采样频率
IIN:感测信号
R1、R2、R3:电阻器
RF:电阻器/反馈电阻器
RIN:电阻器/输入电阻器
V1、V2、V3:电压信号
VCM:共模电压
VIN:输入电压
Φ1S、Φ2S、Φ3S、Φ4S、Φ1H、Φ2H、ΦRESET:控制信号
具体实施方式
现将详细参照本发明的当前优选实施例,所述优选实施例的实例示出在附图中。在附图中及本说明中尽可能地使用相同的参考编号来指代相同或类似的部件。
以下提供实施例以详细阐述本公开,但本公开并非仅限于所提供实施例,且所提供实施例可以适合的方式加以组合。本申请的本说明书(包括权利要求书)中所使用的用语“耦合/被耦合”可指代任何直接连接方式或间接连接方式。举例来说,“第一装置被耦合到第二装置”应被解释为“第一装置直接连接到第二装置”或“第一装置通过其他装置或连接方式间接连接到第二装置”。另外,用语“信号”可指代电流、电压、电荷、温度、数据、电磁波或者任意一个或多个信号。
图1示出根据本发明实施例的触控感测设备的方块图。参照图1,本实施例的触控感测设备10包括信号处理电路100及触控面板200。在本实施例中,触控面板200感测被施加到触控面板200上的手势并向信号处理电路100传输感测信号IIN。信号处理电路100接收并处理来自触控面板200的感测信号IIN并接着将处理结果传输到下一级电路。处理结果可包括触控面板200因手势而产生的电容变化信息。
在本实施例中,触控面板200可为自电容触控面板或互电容触控面板,且本发明并非仅限于此。自电容触控面板可包括排列成阵列的多个自电容传感器。互电容触控面板可包括排列成阵列的多个互电容传感器。信号处理电路100可处理来自自电容触控面板或互电容触控面板的感测信号IIN。可参照现有技术中的常识来得到对触控面板200的结构及其实施例的充分的教示、暗示、及实作方案的例示。
图2示出图1中所绘示信号处理电路的方块图。参照图1及图2,本实施例的信号处理电路100包括模拟前端(AFE)电路110、滤波电路120、及模拟-数字转换器(ADC)130。滤波电路120耦合到模拟前端电路110。模拟-数字转换器130耦合到滤波电路120。在本实施例中,滤波电路120包括反混叠滤波器(AAF)122及梳齿滤波器124。反混叠滤波器122与梳齿滤波器124串联耦合。
在本实施例中,模拟前端电路110从触控面板200接收感测信号IIN。模拟前端电路110对感测信号IIN执行信号捕获操作以捕获感测信号IIN的包括电容变化信息的主信号。本实施例的模拟前端电路110的信号捕获操作可参考现有技术中的常识来充分地教示、暗示、及实施,且因此本文中不再予以赘述。接下来,模拟前端电路110向滤波电路120输出与主信号有关的电流信号AI。滤波电路120的反混叠滤波器122接收电流信号AI。
在本实施例中,反混叠滤波器122可提供预设带宽以使处于所述预设带宽中的信号通过。在实施例中,例如图5所示,预设带宽可为0兆赫到1兆赫(0~1MHz)的带宽,且本发明并非仅限于此。反混叠滤波器122基于预设带宽对电流信号AI进行滤波以向梳齿滤波器124输出电压信号V2。梳齿滤波器124从反混叠滤波器122接收电压信号V2。梳齿滤波器124可基于第一操作频率f1(例如2.4MHz)来进行操作并对电压信号V2进行滤波以向模拟-数字转换器130输出电压信号V1。在本实施例中,模拟-数字转换器130接收电压信号V1并基于第一操作频率f1将模拟格式的电压信号V1转换成数字格式的电压信号V1。在实施例中,模拟-数字转换器130可基于第二操作频率f2(例如1.2MHz)来进行操作,且本发明并非仅限于此。本实施例的模拟-数字转换器130的信号转换操作可参照现有技术中的常识来充分地教示、暗示、及实施,且因此本文中不再予以赘述。
图3示出图2中所绘示模拟前端电路及反混叠滤波器的电路图。参照图3,本实施例的模拟前端电路110包括运算放大器电路112、电流镜电路114、电容器CS及CF、以及电阻器RIN及RF。运算放大器电路112具有反相端、非反相端、及输出端。反相端耦合到输入电阻器RIN的一端、反馈电阻器RF的一端、及反馈电容器CF的一端。非反相端接收输入电压VIN。输入电阻器RIN的另一端耦合到采样电容器CS的一端。采样电容器CS的另一端耦合到地电压。反馈电阻器RF的另一端及反馈电容器CF的另一端耦合到运算放大器电路112的输出端。
在本实施例中,电流镜电路114耦合到运算放大器电路112。电流镜电路114对运算放大器电路112的操作电流I进行镜像以产生电流信号AI,以使得感测信号IIN被放大A倍,且电流信号AI用作将被输出到反混叠滤波器122的输出。符号AI包括电流信号I及其系数A,且系数A表示运算放大器电路112的增益。
在本实施例中,本实施例的反混叠滤波器122包括运算放大器电路116、电容器C1、C2及C3以及电阻器R1、R2及R3。运算放大器电路116具有反相端、非反相端、及输出端。反相端耦合到电流镜电路114、电阻器R2的一端、及电容器C1的一端。非反相端耦合到共模电压VCM。电阻器R2的另一端耦合到电容器C2的一端、电阻器R3的一端、及电阻器R1的一端。电容器C1的另一端耦合到运算放大器电路116的输出端及电阻器R3的另一端。电容器C2的另一端及电阻器R1的另一端耦合到地电压。电压信号V2被输出到梳齿滤波器124。
图4示出图2中所绘示梳齿滤波器的电路图。参照图4,本实施例的梳齿滤波器124包括运算放大器电路118、多个电容器C及多个开关元件。多个控制信号Φ1S、Φ2S、Φ3S、Φ4S、Φ1H、Φ2H、Φ3H、Φ4H、及ΦRESET被配置成控制对应的开关元件。本实施例的梳齿滤波器124的滤波操作可参照现有技术中的常识来充分地教示、暗示、及实施,且因此本文中不再予以赘述。
在本实施例中,梳齿滤波器124可选自一阶梳齿滤波器、二阶梳齿滤波器、及四阶梳齿滤波器中的一个,且本发明并非仅限于此。本文中,针对梳齿滤波器124在图4中示例性地公开一阶梳齿滤波器。本实施例的二阶梳齿滤波器及四阶梳齿滤波器的电路结构及滤波操作可参照现有技术中的常识来充分地教示、暗示、及实施,且因此本文中不再予以赘述。
图5示出图2中所绘示滤波电路120的滤波带形图。水平轴线指示信号频率,且垂直轴线指示信号幅值的绝对值。参照图5,本实施例的滤波电路120包括反混叠滤波器122及梳齿滤波器124。在本实施例中,采样频率FS可被设定成1MHz以将所接收电流信号AI的带宽约束成近似或完全满足相关频带的设计规格。在频率N×FS±FC处,信号幅值的绝对值被设定成具有31dB的延迟,其中N是自然数且FC是中心频率。
图6示出根据本发明另一实施例的信号处理电路的方块图。参照图2及图6,本实施例的信号处理电路300相似于图2中所绘示信号处理电路100,且信号处理电路300与信号处理电路100之间的主要差别例如在于信号处理电路300还包括耦合到梳齿滤波器124的下采样电路340。
具体来说,本实施例的下采样电路340耦合在梳齿滤波器124与模拟-数字转换器130之间。下采样电路340接收电压信号V1并对电压信号V1执行下采样操作以向模拟-数字转换器130输出电压信号V3。本实施例的下采样电路340的下采样操作可参考现有技术中的常识来充分地教示、暗示、及实施,且因此本文中不再予以赘述。
在本实施例中,模拟-数字转换器130接收电压信号V3并基于第二操作频率f2(例如1.2MHz)将模拟格式的电压信号V3转换成数字格式的电压信号V3。在本实施例中,梳齿滤波器124可基于第一操作频率f1(例如2.4MHz)来进行操作。由于进行下采样操作,因此模拟-数字转换器130的第二操作频率f2降低。因此,模拟-数字转换器130的电路设计可简化,且成本降低。
综上所述,在本发明的示例性实施例中,信号处理电路可处理来自自电容触控面板或互电容触控面板的感测信号。模拟前端电路可通过电流镜向滤波电路输出电流信号以降低感测信号传递函数的复杂度。滤波电路可处理电流信号且包括反混叠滤波器及梳齿滤波器。反混叠滤波器与梳齿滤波器的组合可使所述滤波电路中用于电容器设计的电路区域减小。另外,信号处理电路还可包括下采样电路来处理梳齿滤波器的输出,以使得模拟-数字转换器的电路设计可简化。
对于本领域技术人员来说将显而易见,可在不背离本发明的范围或精神的条件下对本发明的结构作出各种润饰及变化。鉴于前述内容,旨在使本发明涵盖本发明的各种润饰及变化,只要所述润饰及变化落于以上权利要求书的范围及其等效范围内即可。
Claims (9)
1.一种信号处理电路,其特征在于,包括:
模拟前端电路,被配置成从触控面板接收感测信号,且对所述感测信号执行信号捕获操作以输出电流信号;以及
滤波电路,耦合到所述模拟前端电路,且被配置成从所述模拟前端电路接收所述电流信号并对所述电流信号执行信号滤波操作以输出第一电压信号,
其中所述滤波电路包括串联耦合的反混叠滤波器与梳齿滤波器。
2.根据权利要求1所述的信号处理电路,其特征在于,所述反混叠滤波器接收所述电流信号并提供预设带宽,且所述反混叠滤波器基于所述预设带宽对所述电流信号进行滤波以向所述梳齿滤波器输出第二电压信号。
3.根据权利要求2所述的信号处理电路,其特征在于,所述梳齿滤波器串联耦合到所述反混叠滤波器并从所述反混叠滤波器接收所述第二电压信号,且所述梳齿滤波器基于第一操作频率来进行操作并对所述第二电压信号进行滤波以输出所述第一电压信号。
4.根据权利要求3所述的信号处理电路,其特征在于,还包括:
模拟-数字转换器,耦合到所述梳齿滤波器,且被配置成接收所述第一电压信号并基于所述第一操作频率将模拟格式的所述第一电压信号转换成数字格式的所述第一电压信号。
5.根据权利要求3所述的信号处理电路,其特征在于,还包括:
下采样电路,耦合到所述梳齿滤波器,且被配置成接收所述第一电压信号并对所述第一电压信号执行下采样操作以输出第三电压信号。
6.根据权利要求5所述的信号处理电路,其特征在于,还包括:
模拟-数字转换器,耦合到所述下采样电路,且被配置成接收所述第三电压信号并基于第二操作频率将模拟格式的所述第三电压信号转换成数字格式的所述第三电压信号,其中所述第二操作频率小于所述第一操作频率。
7.根据权利要求1所述的信号处理电路,其特征在于,所述模拟前端电路包括运算放大器电路及电流镜电路,且所述电流镜电路对所述运算放大器电路的操作电流进行镜像以产生所述电流信号。
8.根据权利要求1所述的信号处理电路,其特征在于,所述梳齿滤波器选自一阶梳齿滤波器、二阶梳齿滤波器、及四阶梳齿滤波器中的一个。
9.根据权利要求1所述的信号处理电路,其特征在于,所述触控面板选自自电容触控面板及互电容触控面板中的一个。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/856,034 | 2017-12-27 | ||
US15/856,034 US10503319B2 (en) | 2017-12-27 | 2017-12-27 | Signal processing circuit for processing sensing signal from touch panel |
Publications (2)
Publication Number | Publication Date |
---|---|
CN109976565A CN109976565A (zh) | 2019-07-05 |
CN109976565B true CN109976565B (zh) | 2022-01-04 |
Family
ID=66948904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201810182941.XA Active CN109976565B (zh) | 2017-12-27 | 2018-03-06 | 用于处理来自触控面板的感测信号的信号处理电路 |
Country Status (2)
Country | Link |
---|---|
US (1) | US10503319B2 (zh) |
CN (1) | CN109976565B (zh) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112753011A (zh) * | 2019-08-29 | 2021-05-04 | 深圳市汇顶科技股份有限公司 | 模拟前端电路以及相关芯片及手持装置 |
WO2021035617A1 (zh) * | 2019-08-29 | 2021-03-04 | 深圳市汇顶科技股份有限公司 | 电容式传感系统以及电容式触摸屏的传感电路和传感方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104731425A (zh) * | 2013-12-23 | 2015-06-24 | 联阳半导体股份有限公司 | 电容式传感器电路 |
Family Cites Families (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5920309A (en) * | 1996-01-04 | 1999-07-06 | Logitech, Inc. | Touch sensing method and apparatus |
CN100555863C (zh) * | 2007-06-25 | 2009-10-28 | 中兴通讯股份有限公司 | 利用级联积分梳状滤波器实现带通滤波的方法和装置 |
US8358142B2 (en) * | 2008-02-27 | 2013-01-22 | Cypress Semiconductor Corporation | Methods and circuits for measuring mutual and self capacitance |
US8058884B2 (en) * | 2008-08-20 | 2011-11-15 | Synaptics Incorporated | System and method for measuring a capacitance and selectively activating an indicating transducer |
US8487639B1 (en) * | 2008-11-21 | 2013-07-16 | Cypress Semiconductor Corporation | Receive demodulator for capacitive sensing |
US8258797B2 (en) * | 2009-06-24 | 2012-09-04 | Synaptics Incorporated | Capacitive sensor interference determination |
US8766931B2 (en) * | 2010-07-16 | 2014-07-01 | Perceptive Pixel Inc. | Capacitive touch sensor having code-divided and time-divided transmit waveforms |
KR101292733B1 (ko) * | 2010-10-18 | 2013-08-05 | 주식회사 포인칩스 | 멀티 터치 패널용 정전용량 감지회로 |
US8729911B2 (en) * | 2011-04-19 | 2014-05-20 | Cypress Semiconductor Corporation | Usage of weighting matrices in multi-phase scanning modes |
US11320946B2 (en) * | 2011-04-19 | 2022-05-03 | Cypress Semiconductor Corporation | Capacitive panel scanning with reduced number of sensing circuits |
DE102012108097A1 (de) * | 2011-09-09 | 2013-03-14 | Samsung Electronics Co., Ltd. | Berührungssteuerungen, Verfahren davon und Vorrichtungen mit den Berührungssteuerungen |
US8766939B2 (en) * | 2012-01-09 | 2014-07-01 | Broadcom Corporation | Highly configurable analog preamp with analog to digital converter |
US8823678B2 (en) * | 2012-01-09 | 2014-09-02 | Broadcom Corporation | Waterproof baseline tracking in capacitive touch controllers |
US9182861B2 (en) * | 2012-01-12 | 2015-11-10 | Synaptics Incoporated | Single layer capacitive imaging sensors |
KR101278121B1 (ko) * | 2012-04-17 | 2013-07-11 | 주식회사 리딩유아이 | 멀티-터치패널용 정전용량 감지회로 및 이를 갖는 멀티-터치 감지장치 |
JP6043679B2 (ja) * | 2012-08-01 | 2016-12-14 | アルプス電気株式会社 | 静電容量検出回路及び入力デバイス |
US20160202809A1 (en) * | 2012-08-31 | 2016-07-14 | Novatek Microelectronics Corp. | Touch Sensing Device and Touch Point Locating Method Thereof |
TWI460633B (zh) * | 2012-08-31 | 2014-11-11 | Novatek Microelectronics Corp | 觸控感應器及其觸控點定位方法 |
US9209861B2 (en) * | 2013-03-15 | 2015-12-08 | The United States Of America, As Represented By The Secretary Of The Navy | Ultra-wideband frequency position modulation using nonlinear compressed sensing |
US9665215B2 (en) * | 2013-03-29 | 2017-05-30 | Stmicroelectronics Asia Pacific Pte Ltd | Method and circuit for parasitic capacitance cancellation for self capacitance sensing |
US9513741B2 (en) * | 2013-08-22 | 2016-12-06 | Texas Instruments Incorporated | Low noise capacitive sensor with integrated bandpass filter |
KR101555515B1 (ko) * | 2014-03-24 | 2015-10-06 | 주식회사 동부하이텍 | 터치 센서 |
US10126870B2 (en) | 2014-06-03 | 2018-11-13 | Synaptics Incorporated | Techniques for mitigating noise in capacitive sensing devices |
US10429998B2 (en) * | 2014-07-23 | 2019-10-01 | Cypress Semiconductor Corporation | Generating a baseline compensation signal based on a capacitive circuit |
US9690408B1 (en) * | 2014-09-26 | 2017-06-27 | Apple Inc. | Electronic device with an integrated touch sensing and force sensing device |
TWI547842B (zh) * | 2014-11-03 | 2016-09-01 | 聯詠科技股份有限公司 | 觸控偵測系統、差異積分調變器及其調變方法 |
KR101948453B1 (ko) * | 2015-07-06 | 2019-02-14 | 시그마센스, 엘엘씨. | 내부 압력 기울기 회전을 갖는 펜 시스템 |
WO2017048835A1 (en) | 2015-09-14 | 2017-03-23 | Synaptics Incorporated | Continuous time anti-alias filter for capacitive touch sensing |
US10025428B2 (en) * | 2015-11-19 | 2018-07-17 | Synaptics Incorporated | Method and apparatus for improving capacitive sensing detection |
CN106775141B (zh) * | 2015-12-30 | 2019-09-27 | 深圳市汇顶科技股份有限公司 | 电容感测电路及触控面板 |
KR102496317B1 (ko) * | 2016-02-12 | 2023-02-06 | 주식회사 디비하이텍 | 센싱 회로 및 이를 포함하는 터치 센서 |
US9983749B2 (en) * | 2016-05-19 | 2018-05-29 | Atmel Corporation | Touch detection |
US20180348954A1 (en) * | 2017-05-31 | 2018-12-06 | Synaptics Incorporated | Capacitive sensing using a phase-shifted mixing signal |
-
2017
- 2017-12-27 US US15/856,034 patent/US10503319B2/en active Active
-
2018
- 2018-03-06 CN CN201810182941.XA patent/CN109976565B/zh active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104731425A (zh) * | 2013-12-23 | 2015-06-24 | 联阳半导体股份有限公司 | 电容式传感器电路 |
Also Published As
Publication number | Publication date |
---|---|
US20190196652A1 (en) | 2019-06-27 |
US10503319B2 (en) | 2019-12-10 |
CN109976565A (zh) | 2019-07-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9256335B2 (en) | Integrated receiver and ADC for capacitive touch sensing apparatus and methods | |
US20140176482A1 (en) | Capacitive touch sensing system with interference rejection | |
US20180209858A1 (en) | Apparatus for detecting capacitance, electronic device and apparatus for detecting force | |
CN111164558B (zh) | 电容检测电路、触控芯片及电子设备 | |
JP5512599B2 (ja) | マルチポイントタッチ表面コントローラ | |
US9524056B2 (en) | Capacitive voltage information sensing circuit and related anti-noise touch circuit | |
US7817075B2 (en) | Apparatus for converting MEMS inductive capacitance | |
US9170675B2 (en) | Noise reduction method, device and system on the basis of touch detection of a capacitive screen | |
US9710118B2 (en) | Semiconductor device and semiconductor system for producing noise differences between points of time | |
CN109976565B (zh) | 用于处理来自触控面板的感测信号的信号处理电路 | |
CN110059536B (zh) | 信号处理电路及处理感测信号的方法 | |
CN111460882B (zh) | 电容式图像感测装置与电容式图像感测方法 | |
WO2021036306A1 (zh) | 电容感测装置 | |
TW201435701A (zh) | 觸碰系統、使用觸碰系統的電話、使用觸碰系統的數位音訊/視訊播放器、以及決定觸碰系統之低雜訊頻率的方法 | |
CN107809245A (zh) | 模拟至数字转换器 | |
TWI818459B (zh) | 指紋檢測放大電路以及指紋識別裝置 | |
WO2022109957A1 (zh) | 自电容检测电路、触控芯片和电子设备 | |
US11275428B2 (en) | Capacitance detection circuit, touch control chip and electronic device | |
TW201915688A (zh) | 電子裝置、接收電路與觸控訊號的處理方法 | |
CN111819528A (zh) | 电容检测电路、触控芯片和电子设备 | |
US7808414B2 (en) | A/D conversion circuit and electronic instrument | |
CN107977119B (zh) | 互电容触控感测电路及噪声抑制方法 | |
CN112363003B (zh) | 自电容检测电路、触控芯片和电子设备 | |
CN112689817A (zh) | 电容检测方法 | |
US8035439B2 (en) | Multi-channel integrator |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |