发明名称 |
Track and hold circuit to reduce pop noise |
摘要 |
<p>An amplifier (50) for voice or audio signals, and particularly for headset applications, uses a low g m amplifier (54) for initially charging an output node (OUT) at the beginning of a power-on phase. After charging the output node, a main amplifier (56) is enabled to amplify the voice or audio signal. At power-down, a sample-and-hold circuit (58) drives an output transistor to discharge an AC coupling capacitor (20). Thus, spikes at the output node are eliminated and an external filtering capacitor is not needed.</p> |
申请公布号 |
EP1689076(A1) |
申请公布日期 |
2006.08.09 |
申请号 |
EP20050290246 |
申请日期 |
2005.02.03 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED;TEXAS INSTRUMENTS FRANCE |
发明人 |
KUBELEC, FREDERIC;SORACE, CHRISTAIN;CUSINATO, PAOLO |
分类号 |
H03F1/30 |
主分类号 |
H03F1/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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