Kijanki,
The generalizations of 1 bit versus multi-bit are kind of correct - but they make it sound awful - remember most of these DACS are achieving very low distortion levels (way way way lower than your speakers) - even the old multi-bits (and dynamic range way way beyond Vinyl, which is limited to about 60 db SPL on a good day with an ideal setup).
Initially, high clock speeds were difficult to achieve - so the resitor network DAC's were popular. These have been mostly replaced by delta sigma one bit DAC designs which became possible with higher clock speeds. (eventually higher speeds led to the concept of DSD and SACD technology being possible - essentially SACD is like a one bit DAC in a mathematical sense) The bleeding edge is now pushing the limits of clock speeds/circuit design and there is once again interest in a resitor network type DAC solutions (or a combination of both by a reduced rsitor network AND a high delta sigma clock speed) to improve S/N ratios above 110 db SPL (bear in mind that 110 db SPL S/N is stupendous already)
The ring DAC does sound like a form of variation on the latest DAC designs (astounding 120 db SPL S/N ratios are now becoming possible). AKM makes chips like this but they don't call them "ring DAC's", but they do use a "random" selection from a resistor network in order to solve the issues of non-linearities in resitor network DAC designs.
One thing to bear in mind is that digital technology is so extremely accurate that it is pushing the limits of both clock speeds and circuit design. The nice thing is that designers are now able to use clever mathematics to overcome even the limitations of both analog resitor network accuracy AND clock speeds to create extremely linear devices through a "random selection" which eliminates 'systematic errors' from real world devices by employing mathematical solutions.
The generalizations of 1 bit versus multi-bit are kind of correct - but they make it sound awful - remember most of these DACS are achieving very low distortion levels (way way way lower than your speakers) - even the old multi-bits (and dynamic range way way beyond Vinyl, which is limited to about 60 db SPL on a good day with an ideal setup).
Initially, high clock speeds were difficult to achieve - so the resitor network DAC's were popular. These have been mostly replaced by delta sigma one bit DAC designs which became possible with higher clock speeds. (eventually higher speeds led to the concept of DSD and SACD technology being possible - essentially SACD is like a one bit DAC in a mathematical sense) The bleeding edge is now pushing the limits of clock speeds/circuit design and there is once again interest in a resitor network type DAC solutions (or a combination of both by a reduced rsitor network AND a high delta sigma clock speed) to improve S/N ratios above 110 db SPL (bear in mind that 110 db SPL S/N is stupendous already)
The ring DAC does sound like a form of variation on the latest DAC designs (astounding 120 db SPL S/N ratios are now becoming possible). AKM makes chips like this but they don't call them "ring DAC's", but they do use a "random" selection from a resistor network in order to solve the issues of non-linearities in resitor network DAC designs.
One thing to bear in mind is that digital technology is so extremely accurate that it is pushing the limits of both clock speeds and circuit design. The nice thing is that designers are now able to use clever mathematics to overcome even the limitations of both analog resitor network accuracy AND clock speeds to create extremely linear devices through a "random selection" which eliminates 'systematic errors' from real world devices by employing mathematical solutions.