Operational amplifier, chip, and electronic device

A chip, wherein the chip comprises an operational amplifier, comprising:

• N stages of amplifiers connected in series and M common-mode feedback circuits, wherein N and M are integers, N≥3, and N≥M>1,
• an ith common-mode feedback circuit in the M common-mode feedback circuits is configured to:
• detect a common-mode output voltage of a (j+b)th stage of amplifier, and regulate an electrical parameter of at least one of a jth stage of amplifier to a (j+b-1)th stage of amplifier, to stabilize the common-mode output voltage of the (j+b)th stage of amplifier,
• an Mth common-mode feedback circuit is configured to detect and stabilize a common-mode output voltage of an Nth stage of amplifier, and
• i, j, and b are integers, M≥i≥1, N≥j≥1, i≥j, j+b≤N, and b≥1.

An electronic device, wherein the electronic device comprises an operational amplifier, comprising:

• N stages of amplifiers connected in series and M common-mode feedback circuits, N and M are integers, N≥3, and N≥M>1,
• an ith common-mode feedback circuit in the M common-mode feedback circuits is configured to:
• detect a common-mode output voltage of a (j+b)th stage of amplifier, and regulate an electrical parameter of at least one of a jth stage of amplifier to a (j+b-1)th stage of amplifier, to stabilize the common-mode output voltage of the (j+b)th stage of amplifier,
• an Mth common-mode feedback circuit is configured to detect and stabilize a common-mode output voltage of an Nth stage of amplifier, and
• i, j, and b are integers, M≥i≥1, N≥j≥1, i≥j, j+b≤N, and b≥1.