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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: "More DACs"..... posted by 13th Duke of Wymbourne on July 15, 2015 at 15:43:18:
If the I/V converter uses a very low value resistor and the current switches are driven off a much higher voltage source then the current contributed by one switch will not be affected very much by the other current sources. The distortion can be made as low as desired simply by lowering the resistor, at least down to the point where output voltage is too low to be amplified with an acceptable signal to noise ratio. This design requires gain downstream of the summing resistor. Another approach is to use a transformer to provide the voltage step up, with similar results.
I haven't said anything that is particularly new, so I don't think there is anything patentable. DSD output filtering can be done by oversampling (as in the SABRE chip) or it can be done by a FIR filter obtained by mixing the output of 1 bit DACs fed with different streams, as in Miksa's design.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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- RE: "More DACs"..... - Tony Lauck 07/15/1516:09:17 07/15/15 (0)
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