TWI477754B - Pressure detecting circuit - Google Patents
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本發明係關於一種壓力偵測電路，尤指一種可濾除環境因素變動之壓力感測電路。The invention relates to a pressure detecting circuit, in particular to a pressure sensing circuit capable of filtering out environmental factors.
壓力感測器目前已廣泛應用於各種電子裝置，用以感測外來的壓力大小，以使電子裝置根據壓力產生相關的指令訊號。例如將一物體置於電子天秤之上，電子天秤內的壓力感測器便會根據物體的重量產生電壓，並根據電壓大小計算出物體的重量。此外，壓力感測器也被應用在觸控面板中，用以感測手指是否對觸控面板進行觸控。Pressure sensors have been widely used in various electronic devices to sense the external pressure, so that the electronic device generates relevant command signals according to the pressure. For example, an object is placed on the electronic scale, and the pressure sensor in the electronic scale generates a voltage according to the weight of the object, and calculates the weight of the object according to the magnitude of the voltage. In addition, the pressure sensor is also applied to the touch panel to sense whether the finger touches the touch panel.
然而，當壓力感測器在進行壓力感測時，其感測的精確度會受許多因素影響，例如環境溫度或環境濕度的變化，將間接改變壓力感測器內部電子元件的阻值或特性，若是在上述影響因素嚴重的情況下，壓力感測器的量測結果將會不夠精準，且會有失真的現象。However, when the pressure sensor is performing pressure sensing, the accuracy of its sensing may be affected by many factors, such as changes in ambient temperature or ambient humidity, which will indirectly change the resistance or characteristics of the internal electronic components of the pressure sensor. If the above factors are serious, the measurement results of the pressure sensor will be inaccurate and there will be distortion.
本發明之一實施例係關於一種壓力偵測電路，包含一多工器、一第一運算放大器、複數個第二參考阻抗、複數個第二運算放大器、複數個第二阻抗及一解多工器。該多工器係包含一輸入端及複數個輸出端，該輸入端係耦接於一電壓源。該第一運算放大器之正輸入 端係耦接於一地端，負輸入端係經由一第一參考阻抗耦接於該第一運算放大器之輸出端。該些第二參考阻抗之每一第二參考阻抗係耦接於該第一運算放大器之負輸入端與該多工器之一對應的輸出端之間。該些第二運算放大器之每一第二運算放大器的正輸入端係耦接於該地端，負輸入端係經由一第一阻抗耦接於該第二運算放大器之輸出端。該些第二阻抗之每一第二阻抗係耦接於該多工器之一對應的輸出端與一對應的第二運算放大器之負輸入端之間。該解多工器包含複數個輸入端，每一輸入端係耦接於一對應的第二運算放大器之輸出端。An embodiment of the invention relates to a pressure detecting circuit including a multiplexer, a first operational amplifier, a plurality of second reference impedances, a plurality of second operational amplifiers, a plurality of second impedances, and a demultiplexing Device. The multiplexer includes an input terminal and a plurality of output terminals coupled to a voltage source. Positive input of the first operational amplifier The end is coupled to a ground end, and the negative input is coupled to the output of the first operational amplifier via a first reference impedance. Each of the second reference impedances is coupled between the negative input end of the first operational amplifier and an output corresponding to one of the multiplexers. The positive input terminal of each of the second operational amplifiers is coupled to the ground terminal, and the negative input terminal is coupled to the output terminal of the second operational amplifier via a first impedance. Each of the second impedances is coupled between an output of one of the multiplexers and a negative input of a corresponding second operational amplifier. The multiplexer includes a plurality of inputs, each of which is coupled to an output of a corresponding second operational amplifier.
本發明之另一實施例係關於一種壓力偵測電路，包含一多工器、複數個第二運算放大器、複數個第二阻抗、一解多工器、一第四運算放大器、一第三阻抗及一可變電阻。該多工器包含一輸入端及複數個輸出端，該輸入端係耦接於一電壓源。每一第二運算放大器之正輸入端係耦接於該地端，負輸入端係經由一第一阻抗耦接於該第二運算放大器之輸出端。每一第二阻抗係耦接於該多工器之一對應的輸出端與一對應的第二運算放大器之負輸入端之間。該解多工器包含複數個輸入端，每一輸入端係耦接於一對應的第二運算放大器之輸出端。該第四運算放大器包含一正輸入端、一負輸入端及一輸出端，該正輸入端係耦接於該解多工器之輸出端。該第三阻抗係耦接於該第四運算放大器之負輸入端與該地端之間，且該可變阻抗係耦接於該第四運算放大器之負輸入端與輸出端之間。Another embodiment of the present invention is directed to a pressure detecting circuit including a multiplexer, a plurality of second operational amplifiers, a plurality of second impedances, a demultiplexer, a fourth operational amplifier, and a third impedance. And a variable resistor. The multiplexer includes an input end and a plurality of output ends coupled to a voltage source. The positive input terminal of each of the second operational amplifiers is coupled to the ground terminal, and the negative input terminal is coupled to the output terminal of the second operational amplifier via a first impedance. Each second impedance is coupled between a corresponding output of one of the multiplexers and a negative input of a corresponding second operational amplifier. The multiplexer includes a plurality of inputs, each of which is coupled to an output of a corresponding second operational amplifier. The fourth operational amplifier includes a positive input terminal, a negative input terminal and an output terminal, and the positive input terminal is coupled to the output end of the demultiplexer. The third impedance is coupled between the negative input terminal and the ground terminal of the fourth operational amplifier, and the variable impedance is coupled between the negative input terminal and the output terminal of the fourth operational amplifier.
本發明之另一實施例係關於一種壓力偵測電路，包含一多工器、複數個第二運算放大器、複數個第二阻抗、一解多工器、一調節器、一參考電壓產生器、一第二類比數位轉換器及一控制單元。該多工器包含一輸入端及複數個輸出端，該輸入端係耦接於一電壓源。每一第二運算放大器之正輸入端係耦接於該地端，且負輸入端係經由一第一阻抗耦接於該第二運算放大器之輸出端。每一第二阻抗係耦接於該多工器之一對應的輸出端與一對應的第二運算放大器之負輸入端之間。該解多工器包含複數個輸入端，每一輸入端係耦接於一對應的第二運算放大器之輸出端。該調節器係耦接於該解多工器之輸出端，用以根據該解多工器之輸出端的電位產生一調節訊號。該參考電壓產生器係耦接於該調節器，用以根據該調節訊號產生一參考電壓。該第二類比數位轉換器係用以根據該參考電壓及該解多工器之輸出端的電位產生一第二數位訊號。該控制單元係耦接於該第二類比數位轉換器及該調節器，用以由該第二類比數位轉換器讀取該第二數位訊號，及根據該調節訊號判斷該參考電壓。Another embodiment of the present invention is directed to a pressure detecting circuit including a multiplexer, a plurality of second operational amplifiers, a plurality of second impedances, a demultiplexer, a regulator, a reference voltage generator, A second analog digital converter and a control unit. The multiplexer includes an input end and a plurality of output ends coupled to a voltage source. The positive input terminal of each of the second operational amplifiers is coupled to the ground terminal, and the negative input terminal is coupled to the output terminal of the second operational amplifier via a first impedance. Each second impedance is coupled between a corresponding output of one of the multiplexers and a negative input of a corresponding second operational amplifier. The multiplexer includes a plurality of inputs, each of which is coupled to an output of a corresponding second operational amplifier. The regulator is coupled to the output of the demultiplexer for generating an adjustment signal according to the potential of the output of the demultiplexer. The reference voltage generator is coupled to the regulator for generating a reference voltage according to the adjustment signal. The second analog-to-digital converter is configured to generate a second digital signal according to the reference voltage and the potential of the output of the demultiplexer. The control unit is coupled to the second analog-to-digital converter and the regulator for reading the second digital signal by the second analog-to-digital converter, and determining the reference voltage according to the adjustment signal.
本發明之另一實施例係關於一種壓力偵測電路，包含一多工器、複數個第二運算放大器、複數個第二阻抗、一解多工器、一調節器、一參考電壓產生器、一第二類比數位轉換器及一控制單元。該多工器包含一輸入端及複數個輸出端，該輸入端係耦接於一電壓源。每一第二運算放大器之正輸入端係耦接於該地端，負輸入端係經由一第一阻抗耦接於該第二運算放大器之輸出端。每一第二阻抗係耦接於該多工器之一對應的輸出端與一對應的第二運算放大器之負輸入 端之間。該解多工器包含複數個輸入端，每一輸入端係耦接於一對應的第二運算放大器之輸出端。該調節器係耦接於該解多工器之輸出端，用以根據該解多工器之輸出端的電位產生一調節訊號。該參考電壓產生器係耦接於該調節器，用以根據該調節訊號產生一參考電壓。該第二類比數位轉換器係用以根據該參考電壓及該解多工器之輸出端的電位產生一第二數位訊號。該控制單元係接於該第二類比數位轉換器及該調節器，用以由該第二類比數位轉換器讀取該第二數位訊號，根據該調節訊號判斷該參考電壓，及根據該第二數位訊號設定用以與該第一輸出電壓比較之至少一比較值。Another embodiment of the present invention is directed to a pressure detecting circuit including a multiplexer, a plurality of second operational amplifiers, a plurality of second impedances, a demultiplexer, a regulator, a reference voltage generator, A second analog digital converter and a control unit. The multiplexer includes an input end and a plurality of output ends coupled to a voltage source. The positive input terminal of each of the second operational amplifiers is coupled to the ground terminal, and the negative input terminal is coupled to the output terminal of the second operational amplifier via a first impedance. Each second impedance is coupled to a corresponding input of one of the multiplexers and a negative input of a corresponding second operational amplifier Between the ends. The multiplexer includes a plurality of inputs, each of which is coupled to an output of a corresponding second operational amplifier. The regulator is coupled to the output of the demultiplexer for generating an adjustment signal according to the potential of the output of the demultiplexer. The reference voltage generator is coupled to the regulator for generating a reference voltage according to the adjustment signal. The second analog-to-digital converter is configured to generate a second digital signal according to the reference voltage and the potential of the output of the demultiplexer. The control unit is coupled to the second analog-to-digital converter and the regulator for reading the second digital signal by the second analog-to-digital converter, determining the reference voltage according to the adjustment signal, and according to the second The digital signal sets at least one comparison value for comparison with the first output voltage.
本發明之另一實施例係關於一種壓力偵測電路，包含一多工器、複數個第二運算放大器、複數個第二阻抗、一解多工器、一調節器、一參考電壓產生器、一第二類比數位轉換器及一控制單元。該多工器包含一輸入端及複數個輸出端，該輸入端係耦接於一電壓源。每一第二運算放大器之正輸入端係耦接於該地端，負輸入端係經由一第一阻抗耦接於該第二運算放大器之輸出端。每一第二阻抗係耦接於該多工器之一對應的輸出端與一對應的第二運算放大器之負輸入端之間。該解多工器包含複數個輸入端，每一輸入端係耦接於一對應的第二運算放大器之輸出端。該調節器係耦接於該解多工器之輸出端，用以根據該解多工器之輸出端的電位產生一調節訊號。該參考電壓產生器係耦接於該調節器，用以根據該調節訊號產生一參考電壓。該第二類比數位轉換器係用以根據該參考電壓及該解多工器之輸出端的電位產生一第二數位訊號。該控制單元係耦接於該第二 類比數位轉換器及該參考電壓產生器，用以由該第二類比數位轉換器讀取該第二數位訊號，及根據該參考電壓產生器讀取該參考電壓。Another embodiment of the present invention is directed to a pressure detecting circuit including a multiplexer, a plurality of second operational amplifiers, a plurality of second impedances, a demultiplexer, a regulator, a reference voltage generator, A second analog digital converter and a control unit. The multiplexer includes an input end and a plurality of output ends coupled to a voltage source. The positive input terminal of each of the second operational amplifiers is coupled to the ground terminal, and the negative input terminal is coupled to the output terminal of the second operational amplifier via a first impedance. Each second impedance is coupled between a corresponding output of one of the multiplexers and a negative input of a corresponding second operational amplifier. The multiplexer includes a plurality of inputs, each of which is coupled to an output of a corresponding second operational amplifier. The regulator is coupled to the output of the demultiplexer for generating an adjustment signal according to the potential of the output of the demultiplexer. The reference voltage generator is coupled to the regulator for generating a reference voltage according to the adjustment signal. The second analog-to-digital converter is configured to generate a second digital signal according to the reference voltage and the potential of the output of the demultiplexer. The control unit is coupled to the second The analog digital converter and the reference voltage generator are configured to read the second digital signal by the second analog digital converter, and read the reference voltage according to the reference voltage generator.
本發明之另一實施例係關於一種壓力偵測電路，包含一多工器、複數個第二運算放大器、複數個第二阻抗、一解多工器、一調節器、一參考電壓產生器、一第二類比數位轉換器及一控制單元。該多工器包含一輸入端及複數個輸出端，該輸入端係耦接於一電壓源。每一第二運算放大器之正輸入端係耦接於該地端，負輸入端係經由一第一阻抗耦接於該第二運算放大器之輸出端。每一第二阻抗係耦接於該多工器之一對應的輸出端與一對應的第二運算放大器之負輸入端之間。該解多工器包含複數個輸入端，每一輸入端係耦接於一對應的第二運算放大器之輸出端。該調節器係耦接於該解多工器之輸出端，用以根據該解多工器之輸出端的電位產生一調節訊號。該參考電壓產生器係耦接於該調節器，用以根據該調節訊號產生一參考電壓。該第二類比數位轉換器係用以根據該參考電壓及該解多工器之輸出端的電位產生一第二數位訊號。一控制單元，耦接於該第二類比數位轉換器及該參考電壓產生器，用以由該第二類比數位轉換器讀取該第二數位訊號，根據該參考電壓產生器讀取該參考電壓，及根據該第二數位訊號設定用以與該第一輸出電壓比較之至少一比較值。Another embodiment of the present invention is directed to a pressure detecting circuit including a multiplexer, a plurality of second operational amplifiers, a plurality of second impedances, a demultiplexer, a regulator, a reference voltage generator, A second analog digital converter and a control unit. The multiplexer includes an input end and a plurality of output ends coupled to a voltage source. The positive input terminal of each of the second operational amplifiers is coupled to the ground terminal, and the negative input terminal is coupled to the output terminal of the second operational amplifier via a first impedance. Each second impedance is coupled between a corresponding output of one of the multiplexers and a negative input of a corresponding second operational amplifier. The multiplexer includes a plurality of inputs, each of which is coupled to an output of a corresponding second operational amplifier. The regulator is coupled to the output of the demultiplexer for generating an adjustment signal according to the potential of the output of the demultiplexer. The reference voltage generator is coupled to the regulator for generating a reference voltage according to the adjustment signal. The second analog-to-digital converter is configured to generate a second digital signal according to the reference voltage and the potential of the output of the demultiplexer. a control unit coupled to the second analog-to-digital converter and the reference voltage generator for reading the second digital signal by the second analog-to-digital converter, and reading the reference voltage according to the reference voltage generator And setting at least one comparison value for comparison with the first output voltage according to the second digital signal.
透過本發明實施例中，預先偵測多工器之複數個輸出端的電位，再偵測複數個第二阻抗的阻值，可在壓力偵測電路偵測施加的外力 時，避免隨著環境因素之變動而造成誤差，因而大幅提升偵測複數個第二阻抗之阻值的準確性。因此，本發明壓力偵測電路可以正確偵測施加外力之大小。In the embodiment of the present invention, the potentials of the plurality of output ends of the multiplexer are detected in advance, and the resistance values of the plurality of second impedances are detected, and the applied external force is detected by the pressure detecting circuit. When the error is caused by changes in environmental factors, the accuracy of detecting the resistance of the plurality of second impedances is greatly improved. Therefore, the pressure detecting circuit of the present invention can correctly detect the magnitude of the applied external force.
請參考第1圖，第1圖係為本發明第一實施例壓力偵測電路1000之示意圖。如第1圖所示，壓力偵測電路1000包含一多工器20、一第一運算放大器104、複數個第二參考阻抗R1至R6、複數個第二運算放大器1050至1058、複數個第二阻抗R21至R50、一解多工器30及一控制單元111。多工器20包含一輸入端28及複數個輸出端21至26，多工器20之輸入端28係耦接於一電壓源Vr。第一運算放大器104之正輸入端係耦接於地端VSS，負輸入端係經由一第一參考阻抗R7耦接於第一運算放大器104之輸出端。第二參考阻抗R1至R6之第一端係分別耦接於多工器20之輸出端21至26，且第二端係耦接於第一運算放大器104之負輸入端。第二運算放大器1050至1058之正輸入端係耦接於地端VSS，負輸入端係分別經由複數個第一阻抗R9至R13分別耦接於第二運算放大器1050至1058之輸出端。第二阻抗R21至R50係耦接於多工器20的輸出端21至26中一對應的輸出端與第二運算放大器1050至1058中一對應的第二運算放大器之負輸入端之間，且第二阻抗R21至R50係為可變電阻。R21至R50的阻值會隨壓力的大小改變，藉以偵測施加於壓力偵測電路1000的外力大小。解多工器30包含複數個輸入端31至35及輸出端36，輸入端31至35係分別耦接於第二運算放大 器1050至1058之輸出端。Please refer to FIG. 1. FIG. 1 is a schematic diagram of a pressure detecting circuit 1000 according to a first embodiment of the present invention. As shown in FIG. 1, the pressure detecting circuit 1000 includes a multiplexer 20, a first operational amplifier 104, a plurality of second reference impedances R1 to R6, a plurality of second operational amplifiers 1050 to 1058, and a plurality of second The impedances R21 to R50, a demultiplexer 30, and a control unit 111. The multiplexer 20 includes an input terminal 28 and a plurality of output terminals 21 to 26. The input terminal 28 of the multiplexer 20 is coupled to a voltage source Vr. The positive input terminal of the first operational amplifier 104 is coupled to the ground terminal VSS, and the negative input terminal is coupled to the output terminal of the first operational amplifier 104 via a first reference impedance R7. The first ends of the second reference impedances R1 to R6 are respectively coupled to the output ends 21 to 26 of the multiplexer 20, and the second ends are coupled to the negative input terminals of the first operational amplifier 104. The positive input terminals of the second operational amplifiers 1050 to 1058 are coupled to the ground terminal VSS, and the negative input terminals are respectively coupled to the output terminals of the second operational amplifiers 1050 to 1058 via a plurality of first impedances R9 to R13. The second impedances R21 to R50 are coupled between a corresponding one of the outputs 21 to 26 of the multiplexer 20 and a negative input of a second operational amplifier of the second operational amplifiers 1050 to 1058, and The second impedances R21 to R50 are variable resistors. The resistance of R21 to R50 changes with the magnitude of the pressure, thereby detecting the magnitude of the external force applied to the pressure detecting circuit 1000. The multiplexer 30 includes a plurality of input terminals 31 to 35 and an output terminal 36. The input terminals 31 to 35 are respectively coupled to the second operational amplifier. The outputs of the devices 1050 to 1058.
請參考方程式(1)，在方程式(1)中，例如在偵測施加於壓力偵測電路1000上對應於第二阻抗R24的位置之外力時，係先偵測多工器20之輸出端24的電位V1。多工器20之輸出端24的電位V1可透過第二參考阻抗R4、第一運算放大器104之輸出端的電位V2'及第一參考阻抗R7計算出來。換言之，由於第二參考阻抗R4及第一參考阻抗R7的阻值係於壓力偵測電路1000被製造時決定，故為已知，因此壓力偵測電路1000僅需透過控制單元111接收之第一運算放大器104之輸出端的電位V2'，就可完成對多工器20之輸出端24的電位V1之偵測。Please refer to equation (1). In equation (1), for example, when detecting a force applied to the position of the pressure detecting circuit 1000 corresponding to the second impedance R24, the output terminal 24 of the multiplexer 20 is detected first. The potential V1. The potential V1 of the output terminal 24 of the multiplexer 20 can be calculated through the second reference impedance R4, the potential V2' at the output of the first operational amplifier 104, and the first reference impedance R7. In other words, since the resistance values of the second reference impedance R4 and the first reference impedance R7 are determined when the pressure detecting circuit 1000 is manufactured, it is known, so the pressure detecting circuit 1000 only needs to receive the first through the control unit 111. The potential V1 of the output terminal of the multiplexer 20 can be detected by the potential V2' at the output of the operational amplifier 104.
由於解多工器30之輸出端36的電位V2可被控制單元111得知，因此第二阻抗R24的阻值便可根據方程式(2)計算出來。在方程式(2)中，第二阻抗R24的阻值係等於負數的第一阻抗R9的阻值乘上解多工器30之輸出端36的電位V2再除以多工器20之輸出端24的電位V1。由於第二阻抗R24的阻值會根據使用者按壓的力道而改變，因此藉由偵測第二阻抗R24的阻值之變化，就可準確得知使用者對壓力偵測電路1000進行按壓的力道大小。Since the potential V2 of the output terminal 36 of the demultiplexer 30 can be known by the control unit 111, the resistance of the second impedance R24 can be calculated according to equation (2). In equation (2), the resistance of the second impedance R24 is equal to the resistance of the first impedance R9 of the negative number multiplied by the potential V2 of the output 36 of the demultiplexer 30 and divided by the output 24 of the multiplexer 20. The potential V1. Since the resistance of the second impedance R24 is changed according to the force pressed by the user, the force of the user to press the pressure detecting circuit 1000 can be accurately known by detecting the change of the resistance of the second impedance R24. size.
由於直接根據解多工器30之輸出端36的電位V2來估測第二阻抗R24的阻值，所估測到的結果會隨著環境因素如溫度、溼度的變 動而產生誤差，而本實施例係先偵測多工器20之輸出端24的電位V1，再一併根據多工器20之輸出端24的電位V1及解多工器30之輸出端36的電位V2來計算出第二阻抗R24的阻值，因此可避免環境因素造成的誤差而得到正確的第二阻抗R24之阻值。Since the resistance of the second impedance R24 is estimated directly from the potential V2 of the output 36 of the demultiplexer 30, the estimated result will vary with environmental factors such as temperature and humidity. The error is generated, and in this embodiment, the potential V1 of the output terminal 24 of the multiplexer 20 is detected first, and then the potential V1 of the output terminal 24 of the multiplexer 20 and the output terminal 36 of the multiplexer 30 are decoupled. The potential V2 is used to calculate the resistance of the second impedance R24, so that the error of the environmental factor can be avoided to obtain the correct resistance of the second impedance R24.
在本實施例中，為方便舉例說明，多工器20僅包含六個輸出端21至26，解多工器30僅包含5個輸入端31至35，然而本發明並不限定多工器20之輸出端21至26及解多工器30之輸入端31至35的數量，此外亦不限定第二參考阻抗R1至R6及第二阻抗R21至R50的數量。In the present embodiment, for convenience of illustration, the multiplexer 20 includes only six output terminals 21 to 26, and the demultiplexer 30 includes only five input terminals 31 to 35. However, the present invention is not limited to the multiplexer 20. The number of the output terminals 21 to 26 and the input terminals 31 to 35 of the demultiplexer 30 does not limit the number of the second reference impedances R1 to R6 and the second impedances R21 to R50.
請參考第2圖，第2圖係為本發明第二實施例壓力偵測電路2000之示意圖。壓力偵測電路2000與壓力偵測電路1000之差別在於，壓力偵測電路2000另包含一第一類比數位轉換器107。第一類比數位轉換器107係耦接於第一運算放大器104之輸出端，用以將第一運算放大器104之輸出端的電位V2’轉換為一第一數位訊號DIG1。控制單元111係耦接於第一類比數位轉換器107，用以讀取接收到的第一數位訊號DIG_1。同樣地，藉由接收第一數位訊號DIG_1，控制單元111亦可得知第一運算放大器104之輸出端的電位V2'，因此可經由方程式(1)、(2)計算出第二阻抗R24的阻值。Please refer to FIG. 2, which is a schematic diagram of a pressure detecting circuit 2000 according to a second embodiment of the present invention. The difference between the pressure detecting circuit 2000 and the pressure detecting circuit 1000 is that the pressure detecting circuit 2000 further includes a first analog-to-digital converter 107. The first analog-to-digital converter 107 is coupled to the output of the first operational amplifier 104 for converting the potential V2' of the output of the first operational amplifier 104 into a first digital signal DIG1. The control unit 111 is coupled to the first analog digital converter 107 for reading the received first digital signal DIG_1. Similarly, by receiving the first digital signal DIG_1, the control unit 111 can also know the potential V2' of the output end of the first operational amplifier 104, so the resistance of the second impedance R24 can be calculated via equations (1) and (2). value.
請參考第3圖，第3圖係為本發明第三實施例壓力偵測電路3000之示意圖。壓力偵測電路3000與壓力偵測電路2000之差別在於， 壓力偵測電路3000另包含一第一增益調整器120。第一增益調整器120係耦接於第一運算放大器104之輸出端與第一類比數位轉換器107之輸入端之間。第一增益調整器120包含一第三運算放大器122、一第三參考阻抗124及一第四參考阻抗126。第三運算放大器122包含一耦接於第一運算放大器104之輸出端的正輸入端、一負輸入端及一輸出端。第三參考阻抗124係耦接於第三運算放大器120之負輸入端與輸出端之間。第四參考阻抗126係耦接於第三運算放大器122之負輸入端與地端VSS之間。Please refer to FIG. 3, which is a schematic diagram of a pressure detecting circuit 3000 according to a third embodiment of the present invention. The difference between the pressure detecting circuit 3000 and the pressure detecting circuit 2000 is that The pressure detecting circuit 3000 further includes a first gain adjuster 120. The first gain adjuster 120 is coupled between the output of the first operational amplifier 104 and the input of the first analog-to-digital converter 107. The first gain adjuster 120 includes a third operational amplifier 122, a third reference impedance 124, and a fourth reference impedance 126. The third operational amplifier 122 includes a positive input terminal, a negative input terminal, and an output terminal coupled to the output end of the first operational amplifier 104. The third reference impedance 124 is coupled between the negative input terminal and the output terminal of the third operational amplifier 120. The fourth reference impedance 126 is coupled between the negative input terminal of the third operational amplifier 122 and the ground terminal VSS.
透過第一增益調整器120中第三運算放大器122、第三參考阻抗124及第四參考阻抗126的設置，第三運算放大器122可將其正輸入端接收到的訊號放大，並將放大後的訊號輸出至第一類比數位轉換器107。因此，相較於壓力偵測電路2000，壓力偵測電路3000的第一類比數位轉換器107所收到的訊號具有較大之解析度(resolution)。Through the setting of the third operational amplifier 122, the third reference impedance 124 and the fourth reference impedance 126 in the first gain adjuster 120, the third operational amplifier 122 can amplify the signal received by the positive input terminal thereof, and the amplified signal The signal is output to the first analog digital converter 107. Therefore, the signal received by the first analog-to-digital converter 107 of the pressure detecting circuit 3000 has a larger resolution than the pressure detecting circuit 2000.
請參考第4圖，第4圖係為本發明第四實施例壓力偵測電路4000之示意圖。壓力偵測電路4000與壓力偵測電路1000之差別在於，壓力偵測電路4000另包含一第二增益調整器130，包含一第四運算放大器132、一第三阻抗134及一可變阻抗136。第四運算放大器132包含一耦接於解多工器30之輸出端36的正輸入端、一負輸入端，及一耦接於控制單元111的輸出端。第三阻抗134係耦接於第四運算放大器132之負輸入端與地端VSS之間。可變阻抗136係耦 接於第四運算放大器132之負輸入端與輸出端之間，且耦接於控制單元111。當控制單元111讀取第四運算放大器132之輸出端的電位V3後，控制單元111可根據第四運算放大器132之輸出端的電位V3調整可變阻抗136之阻值，以調整第二增益調整器130之後接收到的解多工器30之輸出端36的電位V2的增益。Please refer to FIG. 4, which is a schematic diagram of a pressure detecting circuit 4000 according to a fourth embodiment of the present invention. The difference between the pressure detecting circuit 4000 and the pressure detecting circuit 1000 is that the pressure detecting circuit 4000 further includes a second gain adjuster 130, and includes a fourth operational amplifier 132, a third impedance 134, and a variable impedance 136. The fourth operational amplifier 132 includes a positive input terminal coupled to the output terminal 36 of the multiplexer 30, a negative input terminal, and an output coupled to the control unit 111. The third impedance 134 is coupled between the negative input terminal of the fourth operational amplifier 132 and the ground terminal VSS. Variable impedance 136 system coupling It is connected between the negative input terminal and the output terminal of the fourth operational amplifier 132 and is coupled to the control unit 111. After the control unit 111 reads the potential V3 of the output end of the fourth operational amplifier 132, the control unit 111 can adjust the resistance of the variable impedance 136 according to the potential V3 of the output end of the fourth operational amplifier 132 to adjust the second gain adjuster 130. The gain of the potential V2 of the output 36 of the demultiplexer 30 is then received.
同理於第一實施例，在第四實施例中，第四運算放大器132之輸出端的電位V3可被控制單元111偵測到，而第四運算放大器132之輸出端的電位V3等於第四運算放大器132之正輸入端的電位V2乘上第二增益調整器130的增益。由於可變阻抗136係為已知，且第四運算放大器132之輸出端的電位V3已被控制單元111偵測到，故第四運算放大器132之輸入端的電位V2就可以被正確得知，因此當使用者在對壓力偵測電路4000上對應於第二阻抗R24之位置進行按壓時，正確的第二阻抗R24之阻值便可根據方程式(2)計算出來，而可得知施加於壓力偵測電路4000的外力大小。In the same manner as the first embodiment, in the fourth embodiment, the potential V3 at the output of the fourth operational amplifier 132 can be detected by the control unit 111, and the potential V3 at the output of the fourth operational amplifier 132 is equal to the fourth operational amplifier. The potential V2 of the positive input terminal of 132 is multiplied by the gain of the second gain adjuster 130. Since the variable impedance 136 is known, and the potential V3 at the output of the fourth operational amplifier 132 has been detected by the control unit 111, the potential V2 at the input end of the fourth operational amplifier 132 can be correctly known, so When the user presses the position corresponding to the second impedance R24 on the pressure detecting circuit 4000, the resistance of the correct second impedance R24 can be calculated according to the equation (2), and it can be known that the pressure is applied to the pressure detecting. The external force of the circuit 4000.
請參考第5圖，第5圖係為本發明第五實施例壓力偵測電路5000之示意圖。壓力偵測電路5000與壓力偵測電路4000之差別在於，壓力偵測電路5000另包含一第二類比數位轉換器110，耦接於第四運算放大器132之輸出端與控制單元111之間，用以將第四運算放大器132之輸出端的電位V3轉換為一第二數位訊號DIG_2。控制單元111係於讀取第二類比數位轉換器110傳來的第二數位訊號DIG_2後，根據第二數位訊號DIG_2調整可變阻抗136之阻值。同 樣地，藉由接收第二數位訊號DIG_2，控制單元111亦可得知第四運算放大器132之正輸入端的電位V2及輸出端的電位V3之大小，因此可經由方程式(1)、(2)計算出第二阻抗R24的阻值。Please refer to FIG. 5, which is a schematic diagram of a pressure detecting circuit 5000 according to a fifth embodiment of the present invention. The difference between the pressure detecting circuit 5000 and the pressure detecting circuit 4000 is that the pressure detecting circuit 5000 further includes a second analog-to-digital converter 110 coupled between the output end of the fourth operational amplifier 132 and the control unit 111. The potential V3 at the output of the fourth operational amplifier 132 is converted into a second digital signal DIG_2. The control unit 111 adjusts the resistance of the variable impedance 136 according to the second digital signal DIG_2 after reading the second digital signal DIG_2 transmitted from the second analog digital converter 110. with By receiving the second digital signal DIG_2, the control unit 111 can also know the potential V2 of the positive input terminal of the fourth operational amplifier 132 and the potential V3 of the output terminal, and thus can be calculated via equations (1) and (2). The resistance of the second impedance R24 is obtained.
請參考第6圖，第6圖係為本發明第六實施例壓力偵測電路6000之示意圖。壓力偵測電路6000與壓力偵測電路4000之差別在於，壓力偵測電路6000的第二增益調整器630另包含一調節器303，耦接於第四運算放大器132之正輸入端、可變阻抗136及控制單元111。調節器303可根據第四運算放大器132之正輸入端的電位V2調整可變阻抗136的阻值，以使第二增益調整器630的增益得以立即符合第四運算放大器132之正輸入端的電位V2的需求。Please refer to FIG. 6. FIG. 6 is a schematic diagram of a pressure detecting circuit 6000 according to a sixth embodiment of the present invention. The difference between the pressure detecting circuit 6000 and the pressure detecting circuit 4000 is that the second gain adjuster 630 of the pressure detecting circuit 6000 further includes a regulator 303 coupled to the positive input terminal of the fourth operational amplifier 132 and variable impedance. 136 and control unit 111. The regulator 303 can adjust the resistance of the variable impedance 136 according to the potential V2 of the positive input terminal of the fourth operational amplifier 132, so that the gain of the second gain adjuster 630 can immediately conform to the potential V2 of the positive input terminal of the fourth operational amplifier 132. demand.
調節器303包含複數個比較器3032、3034、3036，比較器3032、3034、3036之正輸入端係分別用以接收複數比較電壓Vc1、Vc2、Vc3，用以與解多工器30之輸出端36的電位V2進行比較。透過解多工器30之輸出端36的電位V2與比較電壓Vc1、Vc2、Vc3進行比較，可變阻抗136的阻值會對應的調整。調節器303另可將解多工器30之輸出端36的電位V2與比較電壓Vc1、Vc2、Vc3的比較結果傳至控制單元111，以使控制單元得知第二增益調整器630的增益。此外，控制單元111可根據第四運算放大器132之輸出端的電位V3來設定比較電壓Vc1、Vc2、Vc3的大小。The regulator 303 includes a plurality of comparators 3032, 3034, and 3036. The positive inputs of the comparators 3032, 3034, and 3036 are respectively configured to receive the complex comparison voltages Vc1, Vc2, and Vc3 for outputting the output of the multiplexer 30. The potential V2 of 36 is compared. By comparing the potential V2 of the output 36 of the demultiplexer 30 with the comparison voltages Vc1, Vc2, Vc3, the resistance of the variable impedance 136 is adjusted accordingly. The regulator 303 can further transmit the comparison result of the potential V2 of the output terminal 36 of the demultiplexer 30 with the comparison voltages Vc1, Vc2, Vc3 to the control unit 111 so that the control unit knows the gain of the second gain adjuster 630. Further, the control unit 111 can set the magnitudes of the comparison voltages Vc1, Vc2, and Vc3 according to the potential V3 of the output terminal of the fourth operational amplifier 132.
請參考第7圖，第7圖係為本發明第七實施例壓力偵測電路7000 之示意圖。壓力偵測電路7000與壓力偵測電路6000之差別在於，壓力偵測電路7000另包含一第二類比數位轉換器110，耦接於第四運算放大器132之輸出端與控制單元111之間，用以將第四運算放大器132之輸出端的電位V3轉換為一第二數位訊號DIG2。控制單元111係於讀取第二類比數位轉換器110傳來的第二數位訊號DIG_2後，得知第四運算放大器132之輸入端的電位V2及輸出端的電位V3，並藉此經由方程式(1)、(2)計算出第二阻抗R24的阻值。Please refer to FIG. 7 , which is a pressure detecting circuit 7000 according to a seventh embodiment of the present invention. Schematic diagram. The difference between the pressure detecting circuit 7000 and the pressure detecting circuit 6000 is that the pressure detecting circuit 7000 further includes a second analog-to-digital converter 110 coupled between the output end of the fourth operational amplifier 132 and the control unit 111. The potential V3 at the output of the fourth operational amplifier 132 is converted into a second digital signal DIG2. The control unit 111 is configured to read the second digital signal DIG_2 transmitted from the second analog-to-digital converter 110, and then obtain the potential V2 at the input end of the fourth operational amplifier 132 and the potential V3 at the output end, and thereby pass the equation (1). (2) Calculating the resistance of the second impedance R24.
請參考第8圖，第8圖係為本發明第八實施例壓力偵測電路8000之示意圖。壓力偵測電路8000與壓力偵測電路1000之差別在於，壓力偵測電路8000另包含調節器303、一參考電壓產生器402及一第二類比數位轉換器401。調節器303係耦接於解多工器30之輸出端36，用以根據解多工器30之輸出端36的電位V2產生調節訊號。參考電壓產生器402係耦接於調節器303，用以根據調節器303傳來之調節訊號產生一參考電壓Vref。第二類比數位轉換器401係用以根據參考電壓Vref及解多工器30之輸出端36的電位V2產生一第二數位訊號DIG_2。Please refer to FIG. 8. FIG. 8 is a schematic diagram of a pressure detecting circuit 8000 according to an eighth embodiment of the present invention. The difference between the pressure detecting circuit 8000 and the pressure detecting circuit 1000 is that the pressure detecting circuit 8000 further includes a regulator 303, a reference voltage generator 402 and a second analog digital converter 401. The regulator 303 is coupled to the output 36 of the demultiplexer 30 for generating an adjustment signal according to the potential V2 of the output 36 of the demultiplexer 30. The reference voltage generator 402 is coupled to the regulator 303 for generating a reference voltage Vref according to the adjustment signal transmitted from the regulator 303. The second analog-to-digital converter 401 is configured to generate a second digital signal DIG_2 according to the reference voltage Vref and the potential V2 of the output 36 of the demultiplexer 30.
在第八實施例中，控制單元111係耦接於第二類比數位轉換器401及調節器303，用以讀取由第二類比數位轉換器401傳來的第二數位訊號DIG_2，及根據調節器303傳來的調節訊號判斷參考電壓Vref。In the eighth embodiment, the control unit 111 is coupled to the second analog-to-digital converter 401 and the regulator 303 for reading the second digital signal DIG_2 transmitted by the second analog-to-digital converter 401, and according to the adjustment. The adjustment signal transmitted from the device 303 determines the reference voltage Vref.
調節器303包含複數個比較器3032、3034、3036，比較器3032、3034、3036之正輸入端係分別用以接收複數比較電壓Vc1、Vc2、Vc3，用以與解多工器30之輸出端36的電位V2進行比較。透過解多工器30之輸出端36的電位V2與比較電壓Vc1、Vc2、Vc3進行比較，調節器303會產生對應的調節訊號至參考電壓產生器402，以使參考電壓產生器402產生對應的參考電壓Vref。The regulator 303 includes a plurality of comparators 3032, 3034, and 3036. The positive inputs of the comparators 3032, 3034, and 3036 are respectively configured to receive the complex comparison voltages Vc1, Vc2, and Vc3 for outputting the output of the multiplexer 30. The potential V2 of 36 is compared. By comparing the potential V2 of the output 36 of the demultiplexer 30 with the comparison voltages Vc1, Vc2, Vc3, the regulator 303 generates a corresponding adjustment signal to the reference voltage generator 402 to cause the reference voltage generator 402 to generate a corresponding Reference voltage Vref.
此外，調節器303可將解多工器30之輸出端36的電位V2與比較電壓Vc1、Vc2、Vc3的比較結果傳至控制單元111，以使控制單元111根據調節器303所產生的調節訊號判斷參考電壓Vref，控制單元111得知參考電壓Vref後，便可根據第二數位訊號DIG_2判斷解多工器30之輸出端36的電位V2，並據以經由方程式(1)、(2)計算出第二阻抗R24的阻值，控制單元111另可根據第二數位訊號DIG_2來調整比較電壓Vc1、Vc2、Vc3。In addition, the regulator 303 can transmit the comparison result of the potential V2 of the output terminal 36 of the demultiplexer 30 to the comparison voltages Vc1, Vc2, and Vc3 to the control unit 111, so that the control unit 111 can adjust the signal generated by the regulator 303. After determining the reference voltage Vref, the control unit 111 can determine the potential V2 of the output terminal 36 of the multiplexer 30 according to the second digital signal DIG_2, and calculate according to equations (1) and (2). The control unit 111 can adjust the comparison voltages Vc1, Vc2, and Vc3 according to the second digital signal DIG_2.
請參考第9圖，第9圖係為本發明第九實施例壓力偵測電路9000之示意圖。壓力偵測電路9000與壓力偵測電路8000之差別在於，壓力偵測電路9000的控制單元111係耦接至第二類比數位轉換器401及參考電壓產生器402，但沒有耦接至調節器303。控制單元111係用以由第二類比數位轉換器401讀取第二數位訊號DIG_2，及讀取參考電壓產生器402所產生的參考電壓Vref。相似於第八實施例，在第九實施例中，控制單元111可根據第二數位訊號DIG_2來調整比較電壓Vc1、Vc2、Vc3。Please refer to FIG. 9. FIG. 9 is a schematic diagram of a pressure detecting circuit 9000 according to a ninth embodiment of the present invention. The difference between the pressure detecting circuit 9000 and the pressure detecting circuit 8000 is that the control unit 111 of the pressure detecting circuit 9000 is coupled to the second analog converter 401 and the reference voltage generator 402, but is not coupled to the regulator 303. . The control unit 111 is configured to read the second digital signal DIG_2 by the second analog-to-digital converter 401 and read the reference voltage Vref generated by the reference voltage generator 402. Similar to the eighth embodiment, in the ninth embodiment, the control unit 111 can adjust the comparison voltages Vc1, Vc2, and Vc3 according to the second digital signal DIG_2.
雖然在壓力偵測電路6000、7000、8000、9000中，調節器303係設置為透過比較器3032、3034、3036來對解多工器30之輸出端36的電位V2進行比較，然而本發明並不限於此，用來對解多工器30之輸出端36的電位V2進行比較之不同設置的調節器或手段亦為本發明所涵蓋之範疇。Although in the pressure detecting circuits 6000, 7000, 8000, 9000, the regulator 303 is arranged to compare the potential V2 of the output 36 of the demultiplexer 30 through the comparators 3032, 3034, 3036, the present invention Without being limited thereto, the regulators or means for comparing the different settings of the potential V2 of the output 36 of the multiplexer 30 are also within the scope of the present invention.
此外，為了方便舉例說明，在第四實施例至第九實施例的壓力偵測電路4000、5000、6000、7000、8000、9000中，控制單元111與第一運算放大器104之輸出端之間沒有耦接第一增益調整器120及第一類比數位轉換器107，然壓力偵測電路4000、5000、6000、7000、8000、9000亦可如同第三實施例壓力偵測電路3000中，在控制單元111與第一運算放大器104之輸出端之間耦接第一增益調整器120及/或第一類比數位轉換器107；此外，在第一實施例至第九實施例的壓力偵測電路1000、2000、3000、4000、5000、6000、7000、8000、9000中，亦可不設置第一參考阻抗R7及第一運算放大器104，而將控制單元111直接耦接至第二參考阻抗R1至R6之第二端，任何對本發明第一實施例至第九實施例所為之均等變化及修飾皆屬於本發明涵蓋範圍。又，第一實施例至第九實施例的壓力偵測電路1000、2000、3000、4000、5000、6000、7000、8000、9000可另外包含一溫度感應器10，用以偵測環境溫度。Moreover, for convenience of illustration, in the pressure detecting circuits 4000, 5000, 6000, 7000, 8000, 9000 of the fourth to ninth embodiments, there is no connection between the control unit 111 and the output of the first operational amplifier 104. The first gain adjuster 120 and the first analog-to-digital converter 107 are coupled, but the pressure detecting circuit 4000, 5000, 6000, 7000, 8000, 9000 can also be used in the pressure detecting circuit 3000 of the third embodiment. The first gain adjuster 120 and/or the first analog digital converter 107 are coupled between the output of the first operational amplifier 104 and the output of the first operational amplifier 104. Further, in the pressure detecting circuit 1000 of the first embodiment to the ninth embodiment, In 2000, 3000, 4000, 5000, 6000, 7000, 8000, and 9000, the first reference impedance R7 and the first operational amplifier 104 may not be disposed, and the control unit 111 is directly coupled to the second reference impedance R1 to R6. The two ends, any equivalent variations and modifications to the first to ninth embodiments of the present invention are all within the scope of the present invention. Moreover, the pressure detecting circuits 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000 of the first embodiment to the ninth embodiment may further include a temperature sensor 10 for detecting the ambient temperature.
綜上所述，在本發明第一實施例至第九實施例中，透過預先偵測多工器20之輸出端21至26的電位，再偵測第二阻抗R21至R50 的阻值，可在壓力偵測電路偵測施加的外力時，避免隨著環境因素之變動而造成誤差，因而大幅提升偵測第二阻抗R21至R50之阻值的準確性。因此，本發明壓力偵測電路1000、2000、3000、4000、5000、6000、7000、8000、9000可以正確偵測施加外力之大小。In summary, in the first to ninth embodiments of the present invention, the potentials of the output terminals 21 to 26 of the multiplexer 20 are detected in advance, and the second impedances R21 to R50 are detected. The resistance value can avoid the error caused by the environmental factors when the pressure detecting circuit detects the applied external force, thereby greatly improving the accuracy of detecting the resistance values of the second impedances R21 to R50. Therefore, the pressure detecting circuits 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, and 9000 of the present invention can correctly detect the magnitude of the applied external force.
以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.
10‧‧‧溫度感應器10‧‧‧temperature sensor
20‧‧‧多工器20‧‧‧Multiplexer
21至26、36‧‧‧輸出端21 to 26, 36‧‧‧ output
28、31至35‧‧‧輸入端28, 31 to 35‧‧‧ input
30‧‧‧解多工器30‧‧‧Solution multiplexer
107‧‧‧第一類比數位轉換器107‧‧‧First analog-to-digital converter
104‧‧‧第一運算放大器104‧‧‧First operational amplifier
110、401‧‧‧第二類比數位轉換器110, 401‧‧‧ second analog-to-digital converter
111‧‧‧控制單元111‧‧‧Control unit
120‧‧‧第一增益調整器120‧‧‧First Gain Adjuster
122‧‧‧第三運算放大器122‧‧‧ Third operational amplifier
124‧‧‧第三參考阻抗124‧‧‧ third reference impedance
126‧‧‧第四參考阻抗126‧‧‧fourth reference impedance
130、630‧‧‧第二增益調整器130, 630‧‧‧second gain adjuster
132‧‧‧第四運算放大器132‧‧‧4th operational amplifier
134‧‧‧第三阻抗134‧‧‧ third impedance
136‧‧‧可變阻抗136‧‧‧Variable impedance
303‧‧‧調節器303‧‧‧Regulator
402‧‧‧參考電壓產生器402‧‧‧reference voltage generator
1000、2000、3000、4000、5000、6000、7000、8000、9000‧‧‧壓力偵測電路1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000 ‧ ‧ pressure detection circuit
1050至1058‧‧‧第二運算放大器1050 to 1058‧‧‧Second operational amplifier
3032、3034、3036‧‧‧比較器3032, 3034, 3036‧‧‧ comparator
DIG_1‧‧‧第一數位訊號DIG_1‧‧‧first digit signal
DIG_2‧‧‧第二數位訊號DIG_2‧‧‧second digit signal
R1至R6‧‧‧第二參考阻抗R1 to R6‧‧‧ second reference impedance
R7‧‧‧第一參考阻抗R7‧‧‧ first reference impedance
R9至R13‧‧‧第一阻抗R9 to R13‧‧‧ first impedance
R21至R50‧‧‧第二阻抗R21 to R50‧‧‧second impedance
V1、V2、V2’、V3‧‧‧電位V1, V2, V2', V3‧‧‧ potential
Vc1、Vc2、Vc3‧‧‧比較電壓Vc1, Vc2, Vc3‧‧‧ comparison voltage
Vr‧‧‧電壓源Vr‧‧‧ voltage source
Vref‧‧‧參考電壓Vref‧‧‧reference voltage
VSS‧‧‧地端VSS‧‧‧At the end
第1圖係為本發明第一實施例壓力偵測電路之示意圖。Fig. 1 is a schematic view showing a pressure detecting circuit of a first embodiment of the present invention.
第2圖係為本發明第二實施例壓力偵測電路之示意圖。Fig. 2 is a schematic view showing a pressure detecting circuit of a second embodiment of the present invention.
第3圖係為本發明第三實施例壓力偵測電路之示意圖。Figure 3 is a schematic diagram of a pressure detecting circuit of a third embodiment of the present invention.
第4圖係為本發明第四實施例壓力偵測電路之示意圖。Fig. 4 is a schematic view showing a pressure detecting circuit of a fourth embodiment of the present invention.
第5圖係為本發明第五實施例壓力偵測電路之示意圖。Fig. 5 is a schematic view showing a pressure detecting circuit of a fifth embodiment of the present invention.
第6圖係為本發明第六實施例壓力偵測電路之示意圖。Figure 6 is a schematic diagram of a pressure detecting circuit of a sixth embodiment of the present invention.
第7圖係為本發明第七實施例壓力偵測電路之示意圖。Figure 7 is a schematic diagram of a pressure detecting circuit of a seventh embodiment of the present invention.
第8圖係為本發明第八實施例壓力偵測電路之示意圖。Figure 8 is a schematic diagram of a pressure detecting circuit of an eighth embodiment of the present invention.
第9圖係為本發明第九實施例壓力偵測電路之示意圖。Figure 9 is a schematic diagram of a pressure detecting circuit according to a ninth embodiment of the present invention.
10‧‧‧溫度感應器10‧‧‧temperature sensor
20‧‧‧多工器20‧‧‧Multiplexer
21至26、36‧‧‧輸出端21 to 26, 36‧‧‧ output
28、31至35‧‧‧輸入端28, 31 to 35‧‧‧ input
30‧‧‧解多工器30‧‧‧Solution multiplexer
104‧‧‧第一運算放大器104‧‧‧First operational amplifier
111‧‧‧控制單元111‧‧‧Control unit
1000‧‧‧壓力偵測電路1000‧‧‧ Pressure detection circuit
R1至R6‧‧‧第二參考阻抗R1 to R6‧‧‧ second reference impedance
R7‧‧‧第一參考阻抗R7‧‧‧ first reference impedance
R9至R13‧‧‧第一阻抗R9 to R13‧‧‧ first impedance
R21至R50‧‧‧第二阻抗R21 to R50‧‧‧second impedance
V1、V2、V2’‧‧‧電位V1, V2, V2'‧‧‧ potential
Vr‧‧‧電壓源Vr‧‧‧ voltage source
VSS‧‧‧地端VSS‧‧‧At the end
Claims (29)
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| CN106500736B (en) * | 2016-09-26 | 2019-02-05 | 东南大学 | A kind of linear reading circuit of the resistive sensor array of two dimension |
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| TWM324198U (en) * | 2007-02-15 | 2007-12-21 | Li-Cheng Liou | Circuit structure of a pressure sensing component |
| US20090078059A1 (en) * | 2005-03-30 | 2009-03-26 | Yasuji Ogawa | Pressure Distribution Detection Device |
| CN202110024U (en) * | 2011-06-22 | 2012-01-11 | 苏州合欣美电子科技有限公司 | Pressure sensor signal acquisition circuit |
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| DE4445846A1 (en) * | 1994-12-22 | 1996-06-27 | Sel Alcatel Ag | Method and circuit arrangement for the termination of a line leading to an integrated CMOS circuit |
| CN2492976Y (en) * | 2001-09-07 | 2002-05-22 | 财团法人工业技术研究院 | Automatic gain control circuit for analogue signal |
| CN1260883C (en) * | 2001-11-05 | 2006-06-21 | 瑞昱半导体股份有限公司 | Impedance matching circuit |
| TWI243605B (en) * | 2003-02-27 | 2005-11-11 | Amtran Technology Co Ltd | Wireless signal transmitting and receiving system |
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| US20120042313A1 (en) * | 2010-08-13 | 2012-02-16 | Weng-Hang Tam | System having tunable performance, and associated method |
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| US20090078059A1 (en) * | 2005-03-30 | 2009-03-26 | Yasuji Ogawa | Pressure Distribution Detection Device |
| TWM324198U (en) * | 2007-02-15 | 2007-12-21 | Li-Cheng Liou | Circuit structure of a pressure sensing component |
| CN202110024U (en) * | 2011-06-22 | 2012-01-11 | 苏州合欣美电子科技有限公司 | Pressure sensor signal acquisition circuit |
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