Offset correcting method, offset correcting circuit, and electronic volume

摘要

An offset correcting circuit includes: an amplifying unit including an offset adjusting unit that adjusts an offset of the amplifying unit; and an offset determining unit that that detects the offset of the amplifying unit outputs a signal for correcting the offset of the amplifying unit. The offset determining unit includes a comparing unit that compares an output of the amplifying unit with a reference value, and a counter that increases or decreases a count value in response to an output of the comparing unit. The offset adjusting unit adjusts the offset based on the count value and includes a bias varying portion for varying a bias of the amplifying unit based on the output of the counter.