Activities per year
Abstract
In this paper a digitally-controlled fully differential low-noise current source is presented. It was developed for sensor excitation, however, the concept is applicable wherever a precise digitally-controlled current source is required. The current source is based on a two-stage cascaded Delta Sigma modulator using a current-steering digital-to-analog converter and a novel current amplifier that generates a scaled replica of the output current of the DAC. The D/A conversion is done by 64 unary current cells that are controlled by a timing optimized switch driver. To reduce the flicker noise the current cells are chopped using two banks of current cells, that are activated alternatingly. The proposed fully differential current amplifier uses only a single operational amplifier to deliver a filtered and scaled output current. Thus the typically required intermediate transimpedance amplifier is eliminated, which results in an increased noise performance and a reduced power consumption. The current source has a simulated total harmonic distortion of 99.5dB and a simulated signal-to-noise ratio of 116dB. The proposed circuit was implemented in a 180nm CMOS technology and occupies an area of 1.35 mm2.
Original language | English |
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Title of host publication | 2022 IEEE International Symposium on Circuits and Systems |
Pages | 839-842 |
Number of pages | 4 |
ISBN (Electronic) | 9781665484855 |
DOIs | |
Publication status | Published - 14 Nov 2022 |
Event | 2022 IEEE International Symposium on Circuits and Systems: ISCAS 2022 - Austin, United States Duration: 27 May 2022 → 1 Jun 2022 |
Conference
Conference | 2022 IEEE International Symposium on Circuits and Systems |
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Abbreviated title | ISCAS 2022 |
Country/Territory | United States |
City | Austin |
Period | 27/05/22 → 1/06/22 |
Keywords
- Current Source
- Digitally Controlled
- Fully Differential
- Magnetometer
- Low Noise
ASJC Scopus subject areas
- Electrical and Electronic Engineering
Activities
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A Digitally-Controlled Fully Differential Low Noise Current Source
Scherzer, M. (Speaker)
1 Jun 2022Activity: Talk or presentation › Talk at conference or symposium › Science to science
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2022 IEEE International Symposium on Circuits and Systems
Scherzer, M. (Participant)
28 May 2022 → 1 Jun 2022Activity: Participation in or organisation of › Conference or symposium (Participation in/Organisation of)