Capacitor error averaging is an inherently linear capacitor mismatch calibration technique for pipelined analogtodigital conversion, but its conversion is not very efficient. An improved capacitor error averaging technique was developed to make the conversion more efficient. An operational transconductance amplifier (OTA) offset cancellation scheme based on OTA terminal exchange and error averaging was adopted to avoid the need to connect the OTA in unity gain feedback at the sampling phase time. Thus the settling speed is improved and the power dissipation and chip size are reduced by sharing the OTA between adjacent stages. Circuit analysis and MATLAB simulation indicate that the speed can be typically improved by 14% when the OTA uses a switched-capacitor common-mode feedback and by 23% when it does not, and the power dissipation can be reduced by nearly a half. The improved technique is ideal for high-speed, high-resolution, continuous operation.