[USRP-users] CORDIC rise time

Matt Ettus matt at ettus.com
Mon Apr 8 14:33:10 EDT 2013


The CORDIC does not have a rise time, but it does have a group delay.  Each
stage of the cordic takes one cycle at 100 MHz.  Rise time is associated
with filters, which the CORDIC is not.  It is really only an efficient way
to do a complex multiplication.

Matt


On Sat, Apr 6, 2013 at 12:27 AM, Robert Palumbo <palumr at gmail.com> wrote:

> Hi everyone,
>
> Has anyone ever observed a rise time associated with samples through
> either the CORDIC or digital FIR filters in the DDC chain of the USRP (
> specifically the N210)? I know that the filters should have a rise time,
> which can be accurately predicted in Matlab or in theory, but I was curious
> if the CORDIC would have one as well.
>
> I'm currently using the USRP in a pulsed mode operation, so I'm
> continuously pulsing the DDC chain with samples.
>
> Thanks, any help or advice is appreciated.
>
> Rob
>
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>
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