Dynamic low-frequency noise cancellation in quantum well Hall sensors (QWHS)
| Autor: | Alexandre Kerlain, Vincent Mosser |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Engineering
Noise temperature business.industry Metals and Alloys Electrical engineering Condensed Matter Physics Noise (electronics) Noise floor Surfaces Coatings and Films Electronic Optical and Magnetic Materials Burst noise CMOS Noise generator Optoelectronics Hall effect sensor Flicker noise Electrical and Electronic Engineering business Instrumentation |
| Zdroj: | Sensors and Actuators A: Physical. 142:528-532 |
| ISSN: | 0924-4247 |
| Popis: | We show that the low-frequency noise of AlGaAs/InGaAs/GaAs quantum well Hall sensors (QWHS) can be cancelled using a method similar to the spinning current method. A two-phase permutation of the current biasing electrodes and the voltage sensing electrodes of the Hall cross is performed by a switching circuit made of field effect transistors (FET). A Hall cross and eight switching FETs are integrated on the same chip. This system yields to a noise reduction of 30 dB around 1 Hz. However, the noise floor, typically 140 nT/ Hz in 8 μm devices, remains larger than the expected thermal noise, and is shown to be correlated with leakage current in the FET gates. For comparison, hybrid microsystems using a discrete QWHS and leakage-free CMOS switches were fabricated. They are shown to have a record noise level of 30 nT/ Hz at 1 Hz at room temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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