Noise analysis for high order electromechanical sigma-delta modulators
Noise analysis for high order electromechanical sigma-delta modulators
- Author(s): Y. Dong ; M. Kraft ; W. Redman-White
- DOI: 10.1049/cp:20050148
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- Author(s): Y. Dong ; M. Kraft ; W. Redman-White Source: 5th IEE International Conference on ADDA 2005. Advanced A/D and D/A Conversion Techniques and their Applications, 2005 p. 147 – 152
- Conference: 5th IEE International Conference on ADDA 2005. Advanced A/D and D/A Conversion Techniques and their Applications
- DOI: 10.1049/cp:20050148
- ISBN: 0 86341 542 3
- Location: Limerick, Ireland
- Conference date: 25-27 July 2005
- Format: PDF
This paper analyses the noise shaping properties of a high order electromechanical sigma-delta modulator (ΣΔM), which uses as the loop filter a micromachined sensing element (e.g. from an accelerometer) cascaded with additional electronic integrators. The electronic integrators provide very high gain in signal band, hence the interface electronic noise is decoupled from the quantization noise by the electronic integrators before the quantizer. Simulations show that the signal to noise ratio (SNR) is greatly improved. Furthermore, the interface circuit noise is also shaped to higher frequencies by the sensing element. A comparison is given between a second order loop and a higher order loop. The effects on the entire loop from noise sources at different stages of a higher order loop are also discussed.
Inspec keywords: sigma-delta modulation; quantisation (signal); electromechanical filters; microsensors
Subjects: MEMS and NEMS device technology; A/D and D/A convertors; Filtering methods in signal processing; Codes; Microsensors and nanosensors
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