Noise analysis of correlated double sampling SC integrators with a hold capacitor

Noise performance of the correlated double sampling switched-capacitor integrators incorporating a supplementary hold capacitor is analyzed. These types of integrators rely on an extra capacitor to attenuate the amplifier low-frequency noise. Approximate expressions for the input-referred noise of the integrators are derived. It is shown that a large parasitic capacitance at the amplifier input may seriously degrade the low-frequency noise performance of such structures.