Analysis of Gain and Bandwidth Limitations of Operational Amplifiers in Sigma-Delta Modulators

被引：0
|
作者：
Saalfeld, Tobias [1 ]
Meyer, Alexander [1 ]
Bocholt, Eva Schulte [1 ]
Wunderlich, Ralf [1 ]
Heinen, Stefan [1 ]
机构：
[1] Rhein Westfal TH Aachen, Integrated Analog Circuits & RF Syst Lab, Kopernikusstr 16, D-52074 Aachen, Germany
来源：
2018 14TH CONFERENCE ON PHD RESEARCH IN MICROELECTRONICS AND ELECTRONICS (PRIME 2018) | 2018年
关键词：
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In Sigma-Delta modulator system design the loop filter coefficients are calculated based on ideal circuit behavior. Advancing to an actual circuit implementation based on operational amplifiers, which show finite gain bandwidth products, a deviation of these coefficients is observed. These influences which were not considered during initial coefficient development can lead to performance degradation or even instability. This paper presents an analysis of the influence of the 3 dB bandwidth and the DC gain of an opamp to the signal and noise transfer function of a third order Sigma-Delta modulator. Based on a mathematical analysis of the transfer functions the opamp's influences on a complex integrator and a Tow-Thomas biquad are discussed in order to give a target specification for a circuit implementation.
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页码：125 / 128
页数：4
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