The invention discloses an interstage
gain mismatch
correction method for a pipelined ADC, and belongs to the technical field of analog integrated circuits. Based on the theoretical basis that an ideal ADC input and output characteristic curve is a
linear relation, correction signals with opposite injection symbols are used for enabling residual transfer characteristic curves of two channels to beinconsistent, and therefore
gain correction of a
nonlinear channel is completed through a
linear channel. When the pipelined ADC is a split or time-interleaved pipelined ADC, two channels in the split or time-interleaved pipelined ADC can be used as a reference channel and a correction channel respectively; in addition, the same input
signal can be quantized twice, one quantization channel is used as a reference channel, the other quantization channel is used as a correction channel, and two virtual channels are realized. According to the invention, the problem of
gain mismatch in a pipelinedADC is solved; a mode of solving the slope based on at least three points is provided, and the accuracy is improved compared with a traditional two-point slope method; the method can work in a digital background and has high real-time performance.