2)共模干擾：這種干擾來自于觸摸屏設(shè)備內(nèi)部(如電源、質(zhì)量不好的充電器)并通過手指釋放到地面。

干擾包括寬帶與窄帶噪聲，通常振幅較高。我們看到，共模干擾的頻率可達500kHz，振幅可達40Vpp。見圖2

廈門岳航計算機工程有限公司

聯(lián)系人：李素云

企業(yè)QQ：2851195446，2851195466

手機：18965423501

座機：0592-5165501

圖2：窄帶和寬帶充電器干擾圖

在兩種情況下，用戶都會看到誤觸的情況;包括報告誤觸坐標(biāo)或造成觸摸傳感器過載(觸控會顯示為沿Rx傳感器伸展的長線條)。這會導(dǎo)致流水線收到錯誤指令并造成延遲。在很多情況下，干擾脈沖會充滿接收電容器，從而遺漏本應(yīng)記錄在該交叉點上的觸控信號并影響整體觸控體驗。良好的信噪比(SNR)是觸摸屏控制器抵抗各種干擾的必要條件之一。

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