发明名称 |
Microphone bias current measurement circuit |
摘要 |
<p>A microphone bias current detection circuit includes: a microphone circuit 18; an amplifier 10 having a first output and a second output, the first output is coupled to the microphone circuit 18 for providing a bias current to the microphone circuit 18, the second output provides a sampled current I s proportional to the bias current; a first switch 30 having a first end coupled to the second output of the amplifier 10; a resistor 38 having a first end coupled to a second end of the first switch 30; and a second switch 32 coupled between the first end of the resistor 38 and a reference current source.</p> |
申请公布号 |
EP0930802(A2) |
申请公布日期 |
1999.07.21 |
申请号 |
EP19980310030 |
申请日期 |
1998.12.08 |
申请人 |
TEXAS INSTRUMENTS INC. |
发明人 |
MUZA, JOHN M.;SADKOWSKI, ROBERT;SALLENHAG, MARTEN;WENDELRUP, HEINO |
分类号 |
H04R29/00;(IPC1-7):H04R29/00 |
主分类号 |
H04R29/00 |
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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