Abstract
Switch thermal noise represents a major limitation on the performance of switched-capacitor circuits. In these circuits, the total noise power can be reduced by increasing the sampling capacitance of the circuits. However, it also increases the settling time, hence requires high-performance opamps. This leads to larger power dissipation. A pole-zero cancellation method can be used to improve the settling time while maintaining the power consumption. This paper describes the noise effects caused by this settling time optimization technique in switched-capacitor amplifiers. Theory and simulation results show that the pole-zero cancellation is highly power-efficient technique, even though it increases the noise power.
