发明授权
US07227481B2 Feedback DAC chopper stabilization in a CT single-ended multi-bit sigma delta ADC
有权
反馈DAC斩波稳定在CT单端多位Σ-ΔADC
- 专利标题： Feedback DAC chopper stabilization in a CT single-ended multi-bit sigma delta ADC
- 专利标题（中）： 反馈DAC斩波稳定在CT单端多位Σ-ΔADC
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申请号： US11224457申请日： 2005-09-12
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公开(公告)号： US07227481B2公开(公告)日： 2007-06-05
- 发明人: Maria del Mar Chamarro Marti , Paul John Morrow
- 申请人： Maria del Mar Chamarro Marti , Paul John Morrow
- 申请人地址： US MA Norwood
- 专利权人： Analog Devices, Inc.
- 当前专利权人： Analog Devices, Inc.
- 当前专利权人地址： US MA Norwood
- 代理机构： Wolf, Greenfield & Sacks, P.C.
- 主分类号： H03M3/00
- IPC分类号： H03M3/00
摘要：
A multi-bit sigma-delta analog-to-digital converter (ADC) has a single-ended input for receiving an analog input signal. A multi-bit feedback current digital-to-analog converter (IDAC) generates a multi-level feedback current depending on a multibit digital feedback signal from a Flash ADC. The feedback current is summed with the input signal with the feedback current. The summed signal is integrated on a continuous-time basis. The IDAC is selectively connectable to the summing node via a first path and a second path. The first path transmits current from the IDAC to the summing node with a first polarity and the second path transmits current from the IDAC to the summing node with an inverted polarity. This can reduce flicker noise and can allow the converter to operate without any mid-scale biasing current sources.
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