A High-Precision Sub-10 nV/√Hz Variable Gain Chopper Amplifier for Phase Current Sensing in Adaptive High-Efficiency DC/DC Converters
This paper presents a high-speed chopper amplifier for precise phase current sensing. It is implemented as a fully-differential difference amplifier (FDDA) in a 180 nm Bipolar CMOS DMOS (BCD) technology. Due to the chopping principle, the input referred noise power spectral density is below 10 nV/√Hz. The gain of the amplifier can be precisely adjusted in the range of approximately 50 dB by tuning the chopper frequency. The 3 dB bandwidth ranges from 200 kHz up to 1 MHz depending on the chopper frequency.
Authors
- Christian D. Matthus (ORCID: https://orcid.org/0000-0002-2180-7861)
- Frank Ellinger (ORCID: https://orcid.org/0000-0001-6714-0479)
- Christian Hoyer (ORCID: https://orcid.org/0000-0003-2197-6080)
Institutions
- Technische Universität Dresden (DE)
Publication Details
- Published
- 2025-05-25
- DOI
- https://doi.org/10.1109/iscas56072.2025.11043705
- Primary Topic
- Magnetic Field Sensors Techniques
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Ministry of Education