Efficiency‐enhanced and high‐precision of input common‐mode feedback control using OSA–CLS technique
| Autor: | Qin-Qin Li, Xin-Quan Lai, Kashif Habib, Yu-Heng Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Noise power
Computer science Capacitive sensing Amplifier 020208 electrical & electronic engineering Hardware_PERFORMANCEANDRELIABILITY 02 engineering and technology Noise (electronics) law.invention Computer Science::Hardware Architecture Capacitor Hardware_GENERAL law Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering Operational amplifier Electronic engineering Oversampling Electrical and Electronic Engineering Voltage |
| Zdroj: | Electronics Letters. 56:1303-1306 |
| ISSN: | 1350-911X 0013-5194 |
| DOI: | 10.1049/el.2020.2095 |
| Popis: | Efficiency-enhanced and high-precision input common-mode feedback control (ICMFB) is proposed for a fully differential readout circuit of the MEMS capacitive sensor. This ICMFB improves the efficiency and performance of input common-mode voltage control using a smaller feedback capacitor. The noise performance of the readout circuit is improved as a decrease of a feedback capacitor. The correlated level shift (CLS) technique is used to improve the output swing of the amplifier therefore reduce the value of a feedback capacitor. Also, the oversampling successive approximation (OSA) technique is used to improve the accuracy of input common-mode voltage control using a low-gain op-amp. Simulation results show that the input common-mode voltage error decreases to 0.01% when the value of the feedback capacitor is the same as the MEMS sensor. Also, the noise power spectral density of the readout circuit increases by 10 dB. |
| Databáze: | OpenAIRE |
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