Noise analysis for switched-capacitor circuitry

TL;DRAbstract

Track and hold circuits play a key role in mixed-signal, analog to digital interfaces. They are often used as part of the analog to digital conversion (ADC) process whereby a time-varying analog signal is sampled at the transition of a clock signal and subsequently held for a part of the conversion process. This approach is used, in part, because the remainder of the ADC conversion process is adversely affected if the input signal varies during the conversion. Noise, and in particular thermal noise, is recognized as a major bottleneck limiting the performance of switched-capacitor circuits and it is essential that all of the major contributors to noise are appropriately considered when designing any switched-capacitor circuit. Invariably, switched-capacitor (SC) circuit designers only discuss noise generated in the track mode when reporting noise performance and correspondingly ignore noise generated in the hold mode. In particular, most authors simply use the well-known expression kT/

Chat with Paper

AI Agents for this Paper