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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Ezekwe, C.D. Vanderhaegen, J.P. Xinyu Xing Balachandran, G.K. |
| Copyright Year | 2011 |
| Description | Author affiliation: Robert Bosch, Palo Alto, CA (Ezekwe, C.D.; Vanderhaegen, J.P.; Xinyu Xing; Balachandran, G.K.) |
| Abstract | Many sensors demand energy-efficient precision voltage sensing interfaces with low noise performance down to very low frequencies. Examples include micro Kelvin resolution temperature sensors for wafer stepper temperature stabilization [1] and others [2]. In many such applications, analog-to-digital conversion is inevitable, which mandates sampling. So far, sensor interfaces have demonstrated low offset drift using chopping/auto-zeroing while preserving the intrinsic SNR of the transducer by anti-aliasing filtering before sampling. Integration with a boxcar window, or boxcar sampling, is a particularly convenient way to realize anti-aliasing filtering in the sampling process [3]. However, implementations of the technique, due to their use of just a voltage-to-current converter whose output current is integrated over a time window, e.g. in a sigma-delta modulator [2], remain susceptible to gain drift resulting from either transcon-ductance or time window drift. Meanwhile, related work suggests that embedding the boxcar sampler in a feedback loop effectively removes this limitation [4]. Whereas the loop in [4] is closed electromechanically, the design presented here overcomes the same limitations by using a purely electrical feedback loop to establish a well-defined gain that is insensitive to boxcar sampler parameter drift. |
| Starting Page | 246 |
| Ending Page | 248 |
| File Size | 513727 |
| Page Count | 3 |
| File Format | |
| ISBN | 9781612843032 |
| ISSN | 01936530 |
| e-ISBN | 9781612843025 |
| DOI | 10.1109/ISSCC.2011.5746304 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-02-20 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Noise Sensors Converters Modulation Feedback loop Clocks Resistors |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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