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Effect of switch charge injection on ΣΔ modulator

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3 Author(s)
Yong-Ping Xu ; Sch. of Electr. Eng., New South Wales Univ., Sydney, NSW, Australia ; Rigby, G. ; Starr, M.

The effect of switch charge injection on a second-order ΣΔ modulator has been investigated. It has been found that the switch charge injection can cause an error at the output of the SC integrator and that this integrator error can significantly degrade the dynamic range of the oversampling ΣΔ modulator. The integrator error depends on the switch and the integrating capacitor sizes and the common-mode rejection performance of the op-amp. The differential signal at the input of the modulator can also affect the switch charge injection

Published in:

Microelectronics and VLSI, 1995. TENCON '95., IEEE Region 10 International Conference on

Date of Conference:

6-10 Nov 1995