IV conversion (revisited)

[Zoran]

Hi i notice
that simple Riv IV converter
do not deliver the corect phase on the output.
With only Riv we can expect 180 degrees phase shift...
same thing is with simple deescrete topologies.
It can be showed with simulation of the classic OP amps
IV conversions present in almost every piece of CD player.
From that simulation I got the real polarity of phase.
(Persuming that the Manufacturers did proper way of 0
degrees phase of output voltage...)
Here is proposal of one
topology which does inverting phase, giving rigt phase at the output
of device
I use BUF634 because of the internal simetry and couple of JFETs
Comments please

[Zoran]

here is the sch of
BUF634...

[Jocko Homo]

Those of us who make non-inverting I/V stages, and are lazy, invert the data going into the filter chip............

Jocko

[Elso Kwak]

Originally posted by Zoran
Hi i notice
that simple Riv IV converter
do not deliver the corect phase on the output.
With only Riv we can expect 180 degrees phase shift...
same thing is with simple deescrete topologies.
It can be showed with simulation of the classic OP amps
IV conversions present in almost every piece of CD player.
From that simulation I got the real polarity of phase.
(Persuming that the Manufacturers did proper way of 0
degrees phase of output voltage...)
Here is proposal of one
topology which does inverting phase, giving rigt phase at the output
of device
I use BUF634 because of the internal simetry and couple of JFETs
Comments please

Woooooow you can hear the phase!? Respect!

[Zoran]

Actualy
Yes. The inverted phase can be easely recognised
(I was truy, it is clear only one on one fast test)...
The inverted phase from the DAC IV can be useful
only in case of preamplifier does the same thing too...
Most light poor designed (99%) tube preamps,
that is bring phase to 0...
But still hot signal traveling throught the about 1m
of interconnect cable.
For propper connection in that case We must have
2 x coaxial cable per chanel, ground and hot goes through separate wires
and booth shirms are merged and connected to onlu one side lets say dac side to chasis...

[Zoran]

But what You are think about the design?

[Zoran]

I mentioned IV buffers
that is clear Buffer leaves phase as at the input
because of that is "Buffer".
But that is not whole IV converter circuit, just I recever lets say
When I mention that before I think on IV con generaly...
Sorry I did not have in mind to hurt enybody...

[guido]

Originally posted by Jocko Homo
Those of us who make non-inverting I/V stages, and are lazy, invert the data going into the filter chip............

Some disagree that it is that easy (not me btw).

Originally posted by Zoran
But still hot signal traveling throught the about 1m
of interconnect cable.

Still trying to understand what you mean with that.

[Elso Kwak]

OMG listen to the lowest bit switched on and off on discoteque level! Did you hear it??

[guido]