Multi-stage noise shaping analog-to-digital converter |
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| 申请号 | EP14188331.4 | 申请日 | 2014-10-09 | 公开(公告)号 | EP2863547A3 | 公开(公告)日 | 2015-06-17 |
| 申请人 | Analog Devices Global; | 发明人 | Dong, Yunzhi; Shibata, Hajime; Yang, Wenhua; Schreier, Richard; | ||||
| 摘要 | The present disclosure describes an improved multi-stage noise shaping (MASH) analogto-digital converter (ADC) for converting an analog input signal to a digital output signal. In particular, a full delta-sigma (Δ∑) modulator is provided at the front-end of the MASH ADC, and another full Δ∑ modulator is provided at the back-end of the MASH ADC. The front-end Δ∑ modulator digitizes an analog input signal, and the back-end Δ∑ modulator digitizes an error between the output of the front-end Δ∑ modulator and the (original) analog input signal. In this configuration where the back-end modulator digitizes the error of the (full) front-end modulator, some design constraints of the front-end are relaxed. These design constraints include thermal noise, digital noise cancellation filter complexity (the quantization noise of the front-end is already shaped by the noise transfer function of the front-end), and/or non-linearity. | ||||||
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