Dynamic Offset Compensated Amplifiers with Sub-pA Input Current and Low Distortion
Thije Rooijers (TU Delft - Electronic Instrumentation)
K.A.A Kofi – Promotor (TU Delft - Microelectronics)
Johan H Huijsing – Promotor (TU Delft - Electronic Instrumentation)
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Abstract
CMOS amplifiers suffer from offset (several mVs), offset drift (several µV/°C) and 1/f noise corner (tens of kHz). Dynamic offset compensation (DOC) techniques, such as auto-zeroing and chopping, are often used to achieve low offset (µV level), offset drift (< 20 nV/°C) and 1/f noise corners (several Hz). However, these techniques also have drawbacks, mainly due to the required input switching. This results in unwanted spikes, input current and intermodulation distortion. This thesis presents DOC amplifiers with sub-pA input current, low distortion, as well as quiet outputs.