A 0.18-μm CMOS voltage-to-frequency converter with low circuit sensitivity
A process, voltage, and temperature insensitive resistor-to-frequency converter is proposed. This insensitivity is achieved by matching the current-defining capacitor in a novel switched-capacitor (SC) voltage-to-current (V-I) converter with the integrating capacitor in a conventional relaxation osc...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/105578 http://hdl.handle.net/10220/50161 http://dx.doi.org/10.1109/JSEN.2018.2846635 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A process, voltage, and temperature insensitive resistor-to-frequency converter is proposed. This insensitivity is achieved by matching the current-defining capacitor in a novel switched-capacitor (SC) voltage-to-current (V-I) converter with the integrating capacitor in a conventional relaxation oscillator. Implemented in 0.18-μm CMOS technology, the SC V-I converter together with the relaxation oscillator and voltage regulator occupies 0.45 mm 2 . This paper has shown a sensitivity of 199.9 Hz/(μQ/Q), which is based on a center frequency of 125 kHz. Testing with a commercial sensor, the sensor interface has demonstrated a sensitivity of 1.269 kHz/psi. The sensor interface consumes only 112.5 μW at 1.5-V power supply. Therefore, it is suitable for Internet-of-Things applications. |
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