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首页> 外文期刊>IEEE Transactions on Automatic Control >Multiple operating points in a CMOS log-domain filter
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Multiple operating points in a CMOS log-domain filter

机译：CMOS对数域滤波器中的多个工作点

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摘要

A second-order bandpass filter was designed by converting a conventional bipolar junction transistor-based log-domain filter circuit to its weak-inversion CMOS equivalent. When biased as designed, the filter performed as expected, but theintegrated circuit at times self-biased to an unintended operating point, rendering the circuit useless. This behavior is related to the positive feedback loops used in log-domain (and many other) circuits. Such situations cannot, in general, be predicted by inspection of the circuit topology. A method is presented for predicting and analyzing multiple operating points in SPICE circuit simulation. Of course, the method's predictions apply only to the circuit as modeled in the simulator. Detailed analysisillustrates that the number of operating points can depend on the modeling of effects (in this case, well-substrate leakage currents) that are often modeled carelessly, if at all.
机译：通过将传统的基于双极结晶体管的对数域滤波电路转换为其弱反相CMOS等效电路，设计了一种二阶带通滤波器。当按设计偏置时，滤波器的性能符合预期，但集成电路有时会自偏置到意外的工作点，使电路无用。此行为与对数域（和许多其他）电路中使用的正反馈环路有关。通常，无法通过检查电路拓扑来预测这种情况。提出了一种SPICE电路仿真中多个工作点的预测和分析方法。当然，该方法的预测仅适用于仿真器中建模的电路。详细分析表明，工作点的数量可能取决于效应的建模（在本例中为基板漏电流），这些效应通常是粗心大意的（如果有的话）。

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