Noise Shaping Sigma Delta DACs - ESS Technology, Inc.

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The Trick is “Noise Shaping” • This method of making the error average out to zero is called “Noise Shaping” – It is so called because it does not just ignore the quantization noise: it keeps track of it, and reduces the average to zero • In the “Gas Price” example, the cashier adds up the error and gives you back a penny every now and again to stop the error accumulating ΣΔ/HyperStream 10 of 44
Does Noise Shaping help Audio? • This is a conventional 16bit DAC It is very good indeed, even before we try this noise shaping trick... Zoom in: Ideal DAC • We have to look at a tiny signal to see where it differs from the mathematical ideal ΣΔ/HyperStream 11 of 44
Page 1 and 2: Noise Shaping Sigma Delta DACs Octo
Page 3 and 4: Corporate Overview • ESS was foun
Page 5 and 6: ESS Locations ΣΔ/HyperStream 5 of
Page 7 and 8: What is the price of Gas? (1) • A
Page 9: What is the price of Gas? (3) 1 Mon
Page 13 and 14: How do we know which is best? These
Page 15 and 16: We look in the Frequency Domain Noi
Page 17 and 18: Overview of this Presentation • A
Page 19 and 20: This is a valuable technology.... T
Page 23 and 24: Modulators Omar Khayyam uses error
Page 25 and 26: The “order” of a control system
Page 29 and 30: ESS HyperStream Modulator • The H
Page 31 and 32: What is None PSS Noise? • Periodi
Page 33 and 34: This makes the noise vary The noise
Page 35 and 36: Source of None-PPS Noise (3) • An
Page 37 and 38: Noise vs DC input ΣΔ HyperStream
Page 39 and 40: Non-linear Excess Phase • None-PS
Page 41 and 42: What is Non-linear Excess Phase?
Page 43 and 44: The Sabre DAC • But, engineering

Noise Shaping Sigma Delta DACs - ESS Technology, Inc.

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