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2011 | OriginalPaper | Buchkapitel

4. Architectural-Level Design of the Experimental ΔΣ Modulator

verfasst von : Bupesh Pandita

Erschienen in: Oversampling A/D Converters with Improved Signal Transfer Functions

Verlag: Springer New York

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Abstract

This chapter provides background information for “image transfer function” related to mismatches in complex filters. The impact of mismatches on the modulator proposed in Chap. 3 is examined, and on the basis of the results, an improved complex ΔΣ modulator is proposed.

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Fußnoten
1
This assumes that the area effects dominate and the edge effects can be ignored.
 
2
For an integrator with several SC input branches, the thermal noise due to switches referred to input branch C 1a is given by:
$$\frac{{kT}}{{C_{1a} }}\left( {\frac{{2x + 1}}{{x + 1}}} \right)\left( {1 + \frac{{C_{1b} }}{{C_{1a} }} + \frac{{C_{1c} }}{{C_{1a} }} + \cdots } \right),$$
However, the opamp input noise referred to the input-branch is given by:
$$\left( {\frac{4}{3}} \right)\frac{{kT}}{{C_{1a} }}\left( {\frac{1}{{x + \frac{{C_{1a} + C_{1b} + \ldots }}{{C_{1a} }}}}} \right)\left(1 + \frac{{C_{1b} }}{{C_{1a} }} + \frac{{C_{1c} }}{{C_{1a} }} + \ldots \right)^2 $$
The equation for opamp noise has been derived assuming that all the SC branches have identical time constants. The modified equation reflects the correlated noise injected at the input branches of the integrator.
 
Literatur
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2.
Zurück zum Zitat Jantzi, S.A., Martin, K.W., Sedra, A.S.: The effects of mismatch in complex bandpass Δ∑ modulators. IEEE International Symposium on Circuits and Systems, vol. 1, pp. 227–230, 12–15 May 1996 Jantzi, S.A., Martin, K.W., Sedra, A.S.: The effects of mismatch in complex bandpass Δ∑ modulators. IEEE International Symposium on Circuits and Systems, vol. 1, pp. 227–230, 12–15 May 1996
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Zurück zum Zitat Temes, G.C.: Finite amplifier gain and bandwidth effects in switched-capacitor filters. IEEE J. Solid-State Circuits 15(3), 358–361 (1980)CrossRef Temes, G.C.: Finite amplifier gain and bandwidth effects in switched-capacitor filters. IEEE J. Solid-State Circuits 15(3), 358–361 (1980)CrossRef
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Metadaten
Titel
Architectural-Level Design of the Experimental ΔΣ Modulator
verfasst von
Bupesh Pandita
Copyright-Jahr
2011
Verlag
Springer New York
DOI
https://doi.org/10.1007/978-1-4614-0275-6_4

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