Cirrus Logic’s app note, discussing their own designed chopper amps. Link here (PDF)
The chopper-stabilized amplifiers designed at Cirrus Logic are unique. These amplifiers offer performance benefits that combine the best features of bipolar amplifiers with the best features of chopper amplifiers. The intent of this application note is to understand Cirrus Logic’s unique technology and to see how it can be applied in various measurement applications.
from Dangerous Prototypes http://ift.tt/221Fooa