Noise Shaping Sigma Delta DACs - ESS Technology, Inc.
Noise Shaping Sigma Delta DACs - ESS Technology, Inc.
Noise Shaping Sigma Delta DACs - ESS Technology, Inc.
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Non-linear Excess Phase<br />
• None-PSS noise is the biggest issue, but experiments<br />
suggest there are more problems. For example:<br />
Audiophiles rate as inferior systems that have variable<br />
excess phase<br />
– ΣΔ modulators have stability criteria that vary with amplitude and<br />
ultimately they become unstable as the signal reaches full-scale.<br />
– The HyperStream modulator is unconditionally stable up to full<br />
scale because the excess phase does not change with signal<br />
level<br />
ΣΔ/HyperStream 39 of<br />
44
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