A Passive Switched-Capacitor-Based Multimode Amplifier with a Logarithmic Conformity Error of 0.75% from -25 to 200°C

verfasst von

Hendrik Siemssen, Rochus Nowosielski, Holger Borchardt, Jan Mueller, Bernhard Wicht

Abstract

Harnessing new renewable energy sources, such as geothermal energy, requires integrated electronics to endure harsh environments with temperatures up to 200°C. Acoustic sensors (e.g., piezoelectric) detect environmental composition, as illustrated in Fig. 3.3.1 (top). Due to the natural wide amplitude range of sound pressure waves (1-to-20kHz), the amplifiers in the sensor front-end need both a wide dynamic range (DR) > 80dB to maintain a reasonable signal-to-noise ratio (SNR) at the ADC input, as well as accurate phase and amplitude measurement across a wide temperature range. While logarithmic amplifiers [1], [2], dB-linear amplifiers [3], or automatic gain control (AGC) [4] achieve a high DR, they require post-processing to restore true amplitude levels. Furthermore, logarithmic amplifiers exhibit considerable temperature dependence. Low-drift amplifiers [5] with a typical gain drift of 0.7 ppm/°C can be used over a wide temperature range, but their precision requires trimmed ratios and temperature compensation, leading to complex circuits with reduced reliability at high temperatures. Stacked constant-time amplifiers [6] can be used to achieve high noise efficiency, but advanced discrete-time amplifiers can achieve even higher efficiencies [7]. However, the drawbacks of aliasing and noise folding have to be addressed.

Organisationseinheit(en)

Fachgebiet Mixed-Signal-Schaltungen
Laboratorium für Nano- und Quantenengineering

Externe Organisation(en)

Baker Hughes INTEQ

Typ

Aufsatz in Konferenzband

Publikationsdatum

2025

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Elektrotechnik und Elektronik, Elektronische, optische und magnetische Materialien

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1109/ISSCC49661.2025.10904807 (Zugang: Geschlossen)