High-speed pipelined A/D converter using time-shifted CDS technique

A time-shifted correlated double sampling (CDS) technique is used to compensate for the finite opamp dc gain in the context of a pipelined analog-to-digital converter (ADC). This technique can significantly reduce the errors due to the finite opamp gain without compromising the conversion speed. This is particularly useful for the design of low-voltage and high-speed pipelined ADCs where the trade-off of opamp dc: gain and bandwidth is critical. Behavior simulation results confirm the effectiveness of this new technique.