[hpsdr] Odyssey Siren Design

[Ahti Aintila]

Joe,

The bias arrangement of the opamp OPA1632 may not be the best
regarding the power consumption. Due to the difference between the
reference voltages of the signal switches and the opamps there will be
some extra current drawn, if Vcom is forced to 2.5V. For safety, I
recommend the common reference voltage 1.65V as corrected in the
version "b": <http://kotisivu.dnainternet.net/ahti/sdr-1000/2rzisd-b.pdf>

73, Ahti OH2RZ

On 20/09/06, Joseph Julicher <n9wxu at mac.com> wrote:
> very nice.
> That makes complete sense and answers all the issues.  I will use
> that in Siren.
>
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