Re: Re: Differential follower?
I'm not putting cored inductors in the signal path.
Yes. It's been a month because I've pulled 13 hour shifts at my day job and haven't had time for this.Steve Eddy said:
I'm not putting cored inductors in the signal path.
Borbely's I/Vs are discrete opamps. They don't have low impedance inputs, so it's not a proper solution for a current-output DAC chip, which behaves best with a virtual ground on its output (virtual since it has DC offset; low impedance in AC terms).ticknpop said:
The whole point of a differential receiver is to reject common-mode signals, including common-mode dc offset. My suggested differential opamp topology will work to remove that offset, so long as the differential offset at the output of the I/V stages is low.
Re: Re: Re: Differential follower?
Ah.
But you'll put transistors in the signal path? 😉
se
abzug said:
Ah.
But you'll put transistors in the signal path? 😉
se
Re: Re: Re: Re: Re: Differential follower?
Not according to Lavardin's Gerard Perrot.
se
abzug said:
Not according to Lavardin's Gerard Perrot.
se
If you're referring to thermal memory, there are ways to deal with that with transistors, such as described on peufeu's page.
Anyhow, I've made up my mind regarding transformers. If I were to build a tube power amp, I'd still not use a regular transformer but something like Berning's ZOTL, or high impedance speakers like plasma or electrostatic.
Anyhow, I've made up my mind regarding transformers. If I were to build a tube power amp, I'd still not use a regular transformer but something like Berning's ZOTL, or high impedance speakers like plasma or electrostatic.
The 2.8v is common-mode, common-mode is what a differential circuit rejects, it won't show up on the output.
What I meant when I said "as long as the differential offset is low" is that the DC offset on the output will not depend on the common-mode offset (remember it's rejected) but will depend on the differential offset of the DAC. As long as both DAC outputs sit at the same voltage (2.8v) the single ended output offset will be low, any differential offset from the DAC will be indistinguishable from desired signal and WILL show up on the output.
What I meant when I said "as long as the differential offset is low" is that the DC offset on the output will not depend on the common-mode offset (remember it's rejected) but will depend on the differential offset of the DAC. As long as both DAC outputs sit at the same voltage (2.8v) the single ended output offset will be low, any differential offset from the DAC will be indistinguishable from desired signal and WILL show up on the output.
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