Simulation and analysis of noise in switched capacitor amplifier circuits

Noise is an important factor in switched capacitor amplifiers. There is not a good understanding of device noise in switched capacitor circuits, the basic technique is to use large transistors and capacitance values such that kT/C noise dominates. Besides kT/C noise, however, both device or transistor thermal noise and 1/f noise are contributing factors. Techniques to simulate noise in switched capacitor circuits have only recently become available. These techniques have been applied here to a switched capacitor amplifier as is commonly employed in many analog CMOS circuits. A good comparison is obtained between simulations and analytical techniques. It is apparent that device thermal and l/f noise is an important consideration in switched capacitor circuits