A 14nV/√Hz 14μW Chopper Instrumentation Amplifier with Dynamic Offset Zeroing (DOZ) Technique for Ripple Reduction

Chopping for over 50 MHz gain‐bandwidth product current sense amplifiers achieving input noise level of 8.5 nV/√Hz

“…However, the bandwidth was strictly limited by 200 Hz 10 . More recently, several very promising works have been published using more advanced semiconductor technologies and more complex design concepts in order to even further reduce input noise and offset, while also dealing with chopping‐related challenges 11–25 …”

“…10 More recently, several very promising works have been published using more advanced semiconductor technologies and more complex design concepts in order to even further reduce input noise and offset, while also dealing with chopping-related challenges. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] In general, one typically distinguishes between (1) pure or classical chopping as employed in this work, which is partially extended to nested chopping using several interleaved choppers 3,26 ; (2) chopper stabilization, which is a multipath amplifier approach utilizing a main amplifier and a nulling amplifier 27 ; and (3) analogous auto zeroing, for example, using switched capacitors. Although the basic principle of the latter is different, it is still related to this topic, since the inputs are switched and input offset is reduced.…”