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Effect of Mismatched Loop Delay in Continuous-Time Complex Sigma-Delta Modulators

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5 Author(s)

Continuous-time (CT) complex SigmaDelta modulators seriously suffer from delay in real and imaginary feedback paths. The mismatched loop delay results in a degradation of the signal-to-noise ratio. In this paper, analytical considerations of mismatched loop delay in CT complex SigmaDelta modulators are presented. Discrete-time equivalent transfer functions to that of a CT complex loop filter are derived from continuous-discrete transformation in the complex signal domain. A solution for reducing or compensating the effect of mismatched loop delay is proposed.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:55 ,  Issue: 10 )