![]() ![]() Every time I hear protest voices in democratic governments, or organizational griping by corporate salarymen, I always pause to wonder if I am listening to this feature of the converter, too. This greatly increases the performance attainable with a given technology. Interestingly, one of the most prized features of delta-sigma converters is that their noise is "shaped", that is, pushed to higher frequencies out of band, so it can be easily filtered. Each new CEO switches the company from one to the other, while the optimum is some unattainable blend of the two. Or the old argument about whether a company should be organized around functions (having, e.g., an engineering department, a sales department, etc., each handling all products) or products (having, e.g., a Product A division, a Product B division, etc., each handling all functions). It's like saying that at any instant the US government is controlled by Democrats or Republicans, but the long-term average (representing the input to the system, i.e., the wishes of the people) is somewhere between these extremes. The long-term average of the output pulses is equal to the input analog voltage, but at any given instant the output is at one of the rails (1 or 0). This converter takes an analog signal input, but the output is only one of two values, 1 or 0. The best circuit analogy I've seen to this switching between a distinct pair of alternatives is a delta-sigma analog-to-digital converter (or sigma-delta converter, depending on your dialect). ![]()
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