PRESSURE DETECTOR AND PROCESSING CIRCUIT
To reduce errors of output caused by a displaced phase while suppressing the influence of a common noise.SOLUTION: A processing circuit 30 in a pressure detector includes a first integration circuit 31 for integrating a positive charge signal output from the positive electrode 20b of a piezoelectric...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | To reduce errors of output caused by a displaced phase while suppressing the influence of a common noise.SOLUTION: A processing circuit 30 in a pressure detector includes a first integration circuit 31 for integrating a positive charge signal output from the positive electrode 20b of a piezoelectric element 20; a second integration circuit 32 for integrating a negative charge signal output from the negative electrode 20a of the piezoelectric element 20; and a feedback circuit 33 for feeding a part of the output signal output from the second integration circuit 32 to the second integration circuit 32 through the first integration circuit 31.SELECTED DRAWING: Figure 2
【課題】コモンモードノイズによる影響を抑制するとともに、位相ずれに起因する出力の誤差を低減する。【解決手段】圧力検出装置に設けられた処理回路３０は、圧電素子２０の正極２０ｂから出力される正の電荷信号を積分する第１積分回路３１と、圧電素子２０の負極２０ａから出力される負の電荷信号を積分する第２積分回路３２と、第２積分回路３２から出力される出力信号の一部を、第１積分回路３１を介して第２積分回路３２に帰還させる帰還回路３３とを備えている。【選択図】図２ |
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