gains of less than 40db, even in it's intended use as a balanced mike
preamp ... I'm using a similar INA (INA103) device but it's really
just a baseline for comparison with other (mainly discrete) circuits
I'm working on .... I still think a fully differential input and
output amp is the answer when using a balanced input soundcard like a
Delta ... I can appreciate the need for compatability with a wide
range of soundcards but for ultimate performance that many are seeking
here, a fully differential circuit is truly the way to go
I'll keep in mind the bandwidth needs you describe
JR
--- In [email protected], Guido <[EMAIL PROTECTED]> wrote:
>
> On 6/4/06, Jim Miller <[EMAIL PROTECTED]> wrote:
> >
> >
> > call it a QSD.
>
>
> Actually it is a IQSD (Integrating Quadrature Sampling Detector). In
regular
> sampling, the signal is captured by taking snapshots at relative
short time
> (Dirac comb). For a QSD the signal is integrating in 0.25-0.5 of the
period
> of the sampling frequency. When playing with a Spice model, this
effect is
> observable.
>
> Another interesting observation is that when a differential op amp
is used,
> it needs to be fast enough (have a GBW>30MHz), otherwise the QSD
will have
> conversion losses (for the SDR-1000 INA163, the model showed 17dB
conversion
> loss). Maybe this effect is also a serious contributor to the
performance
> degradation at higher bands ?
>
> Guido
>
>
> [Non-text portions of this message have been removed]
>
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