发明名称 |
Wireless user terminal and system having signal clipping circuit for switched capacitor sigma delta analog to digital converters |
摘要 |
<p>A wireless user terminal (42) and system (40) implementing a mixed signal CODEC (100) including an improved sigma-delta ADC (18) which limits input signals into a switched capacitor configuration and avoids adding circuit overhead in the signal path is disclosed herein. This sigma-delta analog-to-digital converter (18), having an input signal and an output signal, includes a switch (Sw1), a clipping circuit (20), and a known sigma-delta ADC (34). It solves the clipping signal problem by limiting the signal right at the input of the sigma-delta ADC (34). The clipping circuit (20) couples to the switch (sw1) and the sigma-delta ADC (34) for switching the voltage applied to the sigma-delta ADC between the input signal (Vin) and at least one threshold voltage (Vn and Vp).</p> |
申请公布号 |
EP1257061(A2) |
申请公布日期 |
2002.11.13 |
申请号 |
EP20020100428 |
申请日期 |
2002.04.30 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
PANASIK, CARL;SADKOWSKI, ROBERTO |
分类号 |
H03M1/12;H03M3/02;(IPC1-7):H03M3/02 |
主分类号 |
H03M1/12 |
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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