A 24MHz Relaxation Oscillator Using Single Current Mode Comparator with ±1.67% Drift from -40°C to +175°C for Automotive Sensor Application
| Autor: | Shenjie Wang, Cesare Ghezzi, Christian Camp, Arnaud Laville |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Comparator business.industry Low-pass filter 020208 electrical & electronic engineering 010401 analytical chemistry Relaxation oscillator Electrical engineering 02 engineering and technology 01 natural sciences 0104 chemical sciences law.invention CMOS law Duty cycle 0202 electrical engineering electronic engineering information engineering Resistor business Voltage reference Voltage |
| Zdroj: | 2020 IEEE SENSORS. |
| DOI: | 10.1109/sensors47125.2020.9278698 |
| Popis: | This paper presents a 24MHz RC on-chip relaxation oscillator with single current mode comparator for automotive sensor application. This oscillator implements only one high speed comparator operating in current mode and a local reference voltage to control the charging process. The frequency trimming is executed at room temperature to constrain process and mismatch impacts. Duty cycle deviation is attenuated as low as possible since identical hardware is reused between current and following period. The power supply rejection (PSR) is improved by a local regulator and a RC filter separately. The proposed design is fabricated in 0.18-μm CMOS technology. The oscillator analog core consumes 100μA at 3.3V power supply. The measurement results show that a stable output frequency is created as 24MHz after trimming with ±1.67% deviation from -40°C to 175°C. The supply voltage ranges from 1.8V to 3.6V. |
| Databáze: | OpenAIRE |
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