Marco,
I suppose you mean a dac like the TDA1541 which sinks 0~4mA ?
You need to adjust the current source 2mA higher than the current sink, change R1 to something like 1.5K for 2Vrms output.
Also check that 100u capacitor, since with lower R1 there will be more low frequency roll-off.
Rudolf
I suppose you mean a dac like the TDA1541 which sinks 0~4mA ?
You need to adjust the current source 2mA higher than the current sink, change R1 to something like 1.5K for 2Vrms output.
Also check that 100u capacitor, since with lower R1 there will be more low frequency roll-off.
Sonnya, this is incorrect. I use the +V rail as common without problems, it's all relativeyou need an dc blocking cap on your output(-)... then it should work to.
Rudolf
Hi Jocko and all others,
I just got this idea. It is the I/V stage for my latest DAC project...(4th allready.. I'm going to be a real DIY pro one day )
Sorry Jocko, I didn't measure it.. ain't got no distortion or spectrum analyser, but how do you guys feel about this one? I simulates great....but that's just simulation right?
Greetings,
Thijs
I just got this idea. It is the I/V stage for my latest DAC project...(4th allready.. I'm going to be a real DIY pro one day )
Sorry Jocko, I didn't measure it.. ain't got no distortion or spectrum analyser, but how do you guys feel about this one? I simulates great....but that's just simulation right?
Greetings,
Thijs
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the CCS would be considered zero impedance, if it were ideal.
Soory if I'm mistaken, but aren't you confusing a constant current source with a constant voltage source?
gr,
T
Oh brother!............(where art thou.....)
A CCS is supposed to be an infinitely high impedance.
Yes, the gain would higher, except that there is a load resistor hanging off of the CCS to set the gain. That method allows for much lower distortion.
Plus, it adds some PSRR to the circuit, as there is no loop feedback.
Jocko
A CCS is supposed to be an infinitely high impedance.
Yes, the gain would higher, except that there is a load resistor hanging off of the CCS to set the gain. That method allows for much lower distortion.
Plus, it adds some PSRR to the circuit, as there is no loop feedback.
Jocko
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