This paper presents an input-current trimming scheme for auto-zero amplifiers. Since their input current is mainly due to charge injection,the scheme operates by trimming the clock swing,and hence the charge injection,of two dummy input switches. At room temperature,the trimming scheme reduces the maximum input current of an auto-zero stabilized voltage buffer from 1pA to 0.2pA (13 samples) over its full input voltage range (0 to 1.3V). This increases to 0.4pA over temperature (0 to 85°C),which is well below the leakage of typical ESD diodes,and is the lowest input current ever reported for an auto-zero amplifier.
|Title of host publication||ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference (ESSCIRC)|
|Number of pages||4|
|Publication status||Published - 2019|
|Event||45th IEEE European Solid State Circuits Conference, ESSCIRC 2019 - Cracow, Poland|
Duration: 23 Sep 2019 → 26 Sep 2019
|Conference||45th IEEE European Solid State Circuits Conference, ESSCIRC 2019|
|Period||23/09/19 → 26/09/19|