0.6-V, uW-Power 4-Stage OTA with Minimal Components and 100X Load Range
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909728108445696 |
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| author | Privitera, M. Grasso, A. D. Ballo, A. Alioto, M. |
| author_facet | Privitera, M. Grasso, A. D. Ballo, A. Alioto, M. |
| contents | A four-stage operational transconductance amplifier (OTA) for ultra-low-power applications is introduced in this paper. The proposed circuit inclusive of frequency compensation requires minimal transistor count and passives, overcoming the traditionally difficult compensation of 4-stage OTAs and bringing it back to the simplicity of 3-stage OTAs. At the same time, the proposed circuit achieves high power efficiency, as evidenced by the >3.7X (>11.3X) improvement in the large-signal (small-signal) power efficiency figure of merit FOML (FOMS), compared to prior 4-stage OTAs (sub-1 V multi-stage OTAs). Thanks to the lower sensitivity of the phase margin to the load capacitance, the proposed OTA remains stable under a wide range of loads (double-sided as in any 3-4-stage OTA), achieving a max/min ratio of the load capacitance of >100X. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_05499 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | 0.6-V, uW-Power 4-Stage OTA with Minimal Components and 100X Load Range Privitera, M. Grasso, A. D. Ballo, A. Alioto, M. Signal Processing A four-stage operational transconductance amplifier (OTA) for ultra-low-power applications is introduced in this paper. The proposed circuit inclusive of frequency compensation requires minimal transistor count and passives, overcoming the traditionally difficult compensation of 4-stage OTAs and bringing it back to the simplicity of 3-stage OTAs. At the same time, the proposed circuit achieves high power efficiency, as evidenced by the >3.7X (>11.3X) improvement in the large-signal (small-signal) power efficiency figure of merit FOML (FOMS), compared to prior 4-stage OTAs (sub-1 V multi-stage OTAs). Thanks to the lower sensitivity of the phase margin to the load capacitance, the proposed OTA remains stable under a wide range of loads (double-sided as in any 3-4-stage OTA), achieving a max/min ratio of the load capacitance of >100X. |
| title | 0.6-V, uW-Power 4-Stage OTA with Minimal Components and 100X Load Range |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2508.05499 |