Abstract
For spaceborne sensors power-efficient and lightweight circuitry is required, therefore, integrated solutions are preferred. In this paper an integrated current source is presented that can be used in the front-end of a fluxgate- magnetometer. A “radiation aware” design paradigm was followed to account for parameter shifts due to ionizing radiation and allow for radiation hardening without changing the topology.
The digital current source achieves a dynamic range of more than 19 bits. It is based on a Delta-Sigma modulator with a digital pulse-width modulator as a quantizer. The digital-to- analog conversion is performed using a current-steering cell that employs chopping to minimize flicker noise. A fully-differential amplifier is used to drive an improved Howland current source.
Index Terms—current source, precision, radiation hardness, Delta-Sigma
The digital current source achieves a dynamic range of more than 19 bits. It is based on a Delta-Sigma modulator with a digital pulse-width modulator as a quantizer. The digital-to- analog conversion is performed using a current-steering cell that employs chopping to minimize flicker noise. A fully-differential amplifier is used to drive an improved Howland current source.
Index Terms—current source, precision, radiation hardness, Delta-Sigma
| Original language | English |
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| Title of host publication | 2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) |
| Publisher | Institute of Electrical and Electronics Engineers |
| Pages | 5-8 |
| ISBN (Electronic) | 978-1-7281-2788-0 |
| DOIs | |
| Publication status | Published - 2019 |
| Event | 62nd IEEE International Midwest Symposium on Circuits and Systems - Dallas, United States Duration: 4 Aug 2019 → 7 Aug 2019 |
Conference
| Conference | 62nd IEEE International Midwest Symposium on Circuits and Systems |
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| Abbreviated title | MWSCAS |
| Country/Territory | United States |
| City | Dallas |
| Period | 4/08/19 → 7/08/19 |