Re: [Discuss-gnuradio] 4702 board

[Akshay Mishra]

Can't we try IF sampling instead of bringing the signal down to baseband.
With IF sampling the baseband will require more work
but a single downconverter will do the task.

a I1,Q1,-I2,-Q2,I3,Q3..... interpolation (sampling at 2xNyquist) can be used
for downconverting from IF.

can this be done ?

-akshay.

On Sat, Feb 07, 2004 at 09:26:30PM -0800, cfk wrote:
|Dear Akshay:
|    Fine, Akshay. Here is the current question. What should the circuitry
|look like between the IfOut1 & IfOut2 pins of the 4702 and the input
|circuitry of the usrb. The "Microtune 4702 RF Frontend" schematic at
|http://www.comsec.com/4702 shows one lone OPA681 going to a BNC. Near as I
|can tell from Burr-Brown, the OPA681 is now obsolete.
|
|    Should we use an OPA691 to drive a MAX2451 Quadrature Demodulator and
|take the I/I-,Q/Q- outputs of the MAX2451 and run them through 4 individual
|OPA691's? Should we use a Quad output opamp? Is there a better chip then the
|MAX2451 to use for the Quadrature decoder.
|
|    I have started the Orcad Capture and am gathering details together, but
|those particular details are the most mysterious right now.
|
|Charles
|
|
|
|
|----- Original Message -----
|From: "Akshay Mishra" <address@hidden>
|To: <address@hidden>
|Sent: Saturday, February 07, 2004 8:44 PM
|Subject: Re: [Discuss-gnuradio] 4702 board
|
|
|> Charles,
|>     I have some little exposure to DSP board design and can provide some
|> assistance on schematic (Orcad) if required.
|>
|> -Akshay.
|> On Sat, Feb 07, 2004 at 08:26:52PM -0800, cfk wrote:
|> |    Maybe Brian can jump in here with his Maxim knowledge and help us out
|> |with the schematic a bit as it fleshes out over the next week or so.
|> |
|> |Charles, WA6LWB
|>
|>
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|> Discuss-gnuradio mailing list
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|> http://mail.gnu.org/mailman/listinfo/discuss-gnuradio

-- 
akshay mishra

Think !. Atleast give it a thought.