A 1.43-nW 1.3-kHz Resistor-Less Relaxation Oscillator With 67.3-ppm/ ° C Stability
This paper introduces a novel non-RC, leakage-based relaxation oscillator designed as a timer in ultra-low-power (ULP) applications. The proposed oscillator structure is created by stacking a source degeneration and a common-gate amplifier within a single branch, which effectively suppresses the tem...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2025-01-01
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| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/11007579/ |
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| Summary: | This paper introduces a novel non-RC, leakage-based relaxation oscillator designed as a timer in ultra-low-power (ULP) applications. The proposed oscillator structure is created by stacking a source degeneration and a common-gate amplifier within a single branch, which effectively suppresses the temperature dependence of the leakage current. This temperature sensitivity is further mitigated through a two-point calibration method using a thermometer-driven nonlinear polynomial fitting process. The oscillator is designed to produce a 1.3 kHz output and is fabricated using a 180-nm CMOS process, occupying an active area of 0.108 mm2 (including estimates for off-chip blocks). The oscillator consumes 1.43 nW, achieving a power efficiency of 1.1 nW/kHz. It maintains an average temperature sensitivity of 67.3 ppm/°C over a 0-to-90°C temperature range. The supply sensitivity of the oscillator is measured at 0.055%/V across a supply voltage range of 1.1 V to 1.8 V, and the measured Allan deviation floor is 20 ppm. |
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| ISSN: | 2169-3536 |