Timeline for R2R vs String vs Delta Sigma
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 2, 2017 at 6:21 | comment | added | robert bristow-johnson | @Sam, that 4x oversampling per added bit is not about \$\Delta\Sigma\$ per se. Otherwise 3 MHz or 6 MHz sample rate would be far insufficient for audio ADC or DAC. \$\Delta\Sigma\$ also employs feedback and noise shaping which, in addition to the oversampling, increases resolution in the baseband. | |
| Jan 1, 2017 at 12:36 | answer | added | Arnfinn | timeline score: 3 | |
| Jan 1, 2017 at 8:05 | answer | added | Neil_UK | timeline score: 4 | |
| Jan 1, 2017 at 7:40 | comment | added | Jasen Слава Україні | @Sam yeah, ridiculously long and at the business end you'd need 0.00001% tolerance resistors. | |
| Jan 1, 2017 at 7:14 | comment | added | Sam | Delta-sigma has a variable resolution as opposed to the fixed resolution of pretty much everything else. The catch is delta-sigmas require really high oversampling rates to get meaningful resolution (I think it was 4x oversampling per bit or something). So technically speaking both your sources are right, but under different circumstances. Plus it's impractical to build r2r/string dacs for 24 bits as you'd need a ridiculously long resistor string. | |
| Jan 1, 2017 at 3:22 | history | asked | inbinder | CC BY-SA 3.0 |