Successive approximation type analog-to-digital converter and error code detection based digital correction method thereof

The invention discloses a successive approximation type analog-to-digital converter and an error code detection based digital correction method thereof. The correction method comprises steps as follows: 1) an initial value of a correction capacitor is set; 2) a digital correction logic circuit randomly acquires digital output codes of a converter; 3) the output codes are divided into two groups, namely, a group A and a group B, and the output codes are counted by 8-bit counters A and B; 4) if the overflow speed of the 8-bit counter B is higher than that of the 8-bit counter A, the correction capacitor is increased by 0.5 C; if the overflow speed of the 8-bit counter A is higher than that of the 8-bit counter B, the correction capacitor is decreased by 0.5 C; if the overflow speed of the 8-bit counter B is equal to that of the 8-bit counter A, the value of the correction capacitor is unchanged; 5) after Step 4) is finished, the digital correction logic circuit clears the 8-bit counters A and B, and Steps 2)-4) are repeated. According to the correction method, the specific correction process and the conversion process of the successive approximation type analog-to-digital converter are conducted synchronously, no additional correction period or correction time is required, real-time response can be made to PVT change, and the method has the advantage of capability of realizing real-time correction.