OK, I see. I thought it was voltage mode with 200 ohm output impedance. 200 ohm output impedance of the current source does not make sense to me. I would expect 200 kohm.
dusfor99;2223575 said:I dont think we ever claimed a current source, but rather a "current mode". The current mode is simply when the current going in and out the pin of the chip is sensed. This mode has the benefit of cancelling 2nd and 3rd harmonics of some of the internal ananlog circuitry. The "voltage mode" is when the pin of the chip has a voltage on it that is being sensed. While this has the 2nd and 3rd hormics (at the -100dB level or so), some people have even claimed this mode is more "tube-like". Its all personal prefference.
dusfor99;1814598 said:THE [ES9008] output looks like a voltage source with 781.25 Ohm output impedance. "Current mode" is simple when you put the output to a virtual ground and some level (we use 1.65V) then therefore use the current though the 781.25 Ohm in a IV stage. I is not a typical "current source" or "current sink" like the other chips you mention. You could short the output of the chip to ground or AVCC without damaging the chip.
Depends on implentation often more than the type of chip... however here are 2 reviews of products that contain said chip;ES9018K2M
Some comments regarding the possible origins of the "hump" in the ES9038 products:
Did you see my plot from Samuel Groner? The distortion does not appear to be stationary.
That was from the ES9008 or ES9018 though, right? I think there was discussion of at least one issue that was fixed in the newer parts. I don't recall that anyone ever repeated Samuel's test, though.
That was from the ES9008 or ES9018 though, right? I think there was discussion of at least one issue that was fixed in the newer parts. I don't recall that anyone ever repeated Samuel's test, though.
Where is this Groner test documented? I’m willing to give it a shot on the 9038, now is a good moment.
Where is this Groner test documented? I’m willing to give it a shot on the 9038, now is a good moment.
The level of the hump on X16 is already quite low comparing to those that were originally revealed. The hump shows up because the noise performance is very good. Granted it can be treated. I don't think it's audible this time.How many here can actually hear the hump? How to check? I have gustard x16 with the hump. Thx!
It doesn't have to.@WolfX-700 just published measurements of the SMSL SU-8s, same chip as the X16 (ESS9068), also showing the hump.