Re: [Discuss-gnuradio] 4702 board

[cfk]

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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