1-bit DAC


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1-bit DAC

(1-bit Digital to Analog Converter) A serial method of converting digital samples back into analog form for amplification. Each bit of the sample is converted into its analog weight rather than all bits of the sample converted in parallel. See ladder DAC and SACD.
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A 1-bit DAC as employed for the purpose is shown in Figure 14(a) and its exemplary output is depicted in Figure 14(b).
Caption: Figure 14: (a) 1-bit DAC and (b) output response.
So, Figure 1 presents a MEMS accelerometer-based 4th-order Sigma-Delta modulator, where the 2nd-order digital integrator H(z) is inserted between AFE and 1-bit comparator; [K.sub.1] is the quantizer gain; [Q.sub.1] is the quantization noise of 1-bit quantizer, and [K.sub.2] is the equivalent linear model of 1-bit DAC feedback.
If the period at which the 1-bit DAC pin changes value is [T.sub.LVPECL_CLK_] then the pulse corresponding to one period duration starting at time [T.sub.o] can be represented as below.
The question that's been dogging my CD player reviews is whether 1-bit DACs are inherently inferior to multi-bit units, or whether I've just been unlucky (or hearing things).