Differential operational amplifier with common mode feedback

Details Differential operational amplifier with common mode feedback Differential operational amplifier with common mode feedback

H - Electricity

03

F

330/22

H03F 3/45 (2006.01) H03F 1/08 (2006.01)

Patent

CA 1206217

DIFFERENTIAL OPERATIONAL AMPLIFIER WITH COMMON MODE FEEDBACK Yusuf Haque Erwin Ofner ABSTRACT A differential operational amplifier is provided with a feedback loop which continuously adjusts the common mode voltage level of the amplifier so that it lies in the center of the dynamic range of the amplifier. The feedback loop measures the instantaneous common mode voltage level and compares it with a reference voltage which is set to reflect the desired common mode voltage. An error signal is generated and fed back into the amplifier to adjust the instantaneous common mode voltage level towards the reference level. Frequency compensation is also provided to overcome the phase shift introduced by the use of RC networks.

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