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How to implement fully differential amplifier based on two single ended amplifiers.
You'll need an additional common mode feedback path to implement a fully differential amplifier. Otherwise the "standard feedback" isn't able to keep both outputs within reasonable bounds.Cross-connect the inputs (INP1=INN2 , INN1=INP2) , VREF1=VREF2 . Standard feedback.
Right! I forgot the necessary CMFB circuit, sorry :sad:You'll need an additional common mode feedback path ...
You'll need an additional common mode feedback path to implement a fully differential amplifier. Otherwise the "standard feedback" isn't able to keep both outputs within reasonable bounds.
See this principle paper, fig. 2 : View attachment CMFB4fully-differential_OpAmps.pdfHow to implement your mentioned "additional common mode feedback path" ? Could you please show any example.