Abstract
Lock-in amplifiers are versatile measuring instruments for extracting a narrow-bandwidth signal with a known carrier from noisy environments. The lock-in amplifier presented here has therefore been designed to provide an efficient readout of the second harmonic of fluxgate sensors. However, existing analog lock-in amplifiers use band-pass filters with increased component count or even omit them altogether. Therefore, the proposed lock-in amplifier takes advantage of the N-path filter principle to minimize chip area and power consumption. The lock-in amplifier consists of a low noise programmable gain preamplifier and a passive band-pass filter that uses a switched-capacitor topology. In this way, the filter achieves a high level of power efficiency and reconfigurability in terms of a tunable center frequency and bandwidth. The complete circuit is integrated on chip using a 180nm CMOS technology and occupies a total area of only 0.42mm^2. Moreover, the lock-in amplifier achieves a simulated input-referred noise voltage of 5.5nV /\sqrtHz at 10kHz while consuming less than 1mA under a 1.8V supply voltage.
Originalsprache | englisch |
---|---|
Titel | 2023 21st IEEE Interregional NEWCAS Conference (NEWCAS) |
Seitenumfang | 4 |
ISBN (elektronisch) | 9798350300246 |
DOIs | |
Publikationsstatus | Veröffentlicht - 2023 |
Veranstaltung | 21st IEEE Interregional NEWCAS Conference: NEWCAS 2023 - Edinburgh, Großbritannien / Vereinigtes Königreich Dauer: 26 Juni 2023 → 28 Juni 2023 |
Konferenz
Konferenz | 21st IEEE Interregional NEWCAS Conference |
---|---|
Kurztitel | NEWCAS 2023 |
Land/Gebiet | Großbritannien / Vereinigtes Königreich |
Ort | Edinburgh |
Zeitraum | 26/06/23 → 28/06/23 |
ASJC Scopus subject areas
- Sicherheit, Risiko, Zuverlässigkeit und Qualität
- Instrumentierung
- Elektrotechnik und Elektronik
- Hardware und Architektur
- Computernetzwerke und -kommunikation
- Modellierung und Simulation