Distortion analysis of bootstrap switch using Volterra series

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Distortion analysis of bootstrap switch using Volterra series

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Linear behaviour of bootstrap switches is of critical importance in low-voltage analogue circuits and understanding the major factors affecting the linearity helps design a better switch. This study presents a theoretical approach for evaluating the distortion of bootstrap switches in the frequency domain based on the Volterra series. Five major factors affecting the linearity of the bootstrap switch are examined. In order to obtain a general design guideline the analysis is done in two parts. First, the distortion because of the non-linear I–V characteristic of the main transistor of the switch is considered. In the second part, the distortion because of sampling errors, such as clock feed-through and charge injection, are added to the analysis. The theoretical results are verified by circuit simulations in a 0.18 µm CMOS process, using HSpice.

Inspec keywords: transistor circuits; linear network analysis; CMOS integrated circuits; switches; bootstrap circuits; analogue circuits; Volterra series

Other keywords: frequency domain; nonlinear I-V characteristic; charge injection; CMOS process; distortion analysis; bootstrap switches; linear behaviour; Volterra series; HSpice; low-voltage analogue circuits; transistor; size 0.18 mum; circuit simulations

Subjects: Relays and switches; Linear network analysis and design; CMOS integrated circuits

References

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