The total integrated noise in passive switched-capacitor and N-path filters is traditionally calculated using frequency-domain methods. We derive a technique that allows the determination of the total noise in such networks by inspection. The key aspect of our derivation is to exploit the properties of sampled linear periodically-switched networks, and to work in the time domain. Simulation results that support our analysis are given. © 2019 IEEE

Shanthi Pavan Y

Department of Electrical Engineering

Frequency domain analysis

Switched capacitor filters

Time domain analysis

Frequency-domain methods

SIMPLIFIED ANALYSIS

Switched Capacitor

Time domain

Passive filters

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Simplified Analysis of Total Integrated Noise in Passive Switched-Capacitor and N-Path Filters

Proceedings - IEEE International Symposium on Circuits and Systems

Recent innovations in software defined CMOS radio transceiver architectures heavily rely on high-linearity switched-RC sampler and passive-mixer circuits, driven by digitally programmable multiphase clocks. Although seemingly simple, the frequency domain analysis of these linear periodically time variant (LPTV) circuits is often deceptively complex. This paper uses the properties of sampled LPTV systems and the adjoint (inter-reciprocal) network to greatly simplify the analysis of the switched-RC circuit. We first derive the transfer function of the equivalent linear time-invariant filter relating the input to the voltage sampled on the capacitor in the switched-RC kernel. We show how a leakage resistor across the capacitor can be easily addressed using our technique. A signal-flow graph is then developed for the complete continuous-time voltage waveform across the capacitor, and simplified for various operating regions. We finally derive the noise properties of the kernel. The results we derive have largely been reported in prior works, but the use of the adjoint network simplifies the derivation, while also providing circuit insight. © 2017 IEEE.

Fulltext

IEEE Transactions on Circuits and Systems I: Regular Papers

Simplified Unified Analysis of Switched-RC Passive Mixers, Samplers, and $n$-Path Filters Using the Adjoint Network

Simplified analysis of total integrated noise in passive switched-capacitor and N-path filters

Journal	Data powered by TypesetProceedings - IEEE International Symposium on Circuits and Systems
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
ISSN	02714310
Open Access	No