Looking ahead here at what we are getting into. With enough samples to recover from a mistake, this is something I noted. If someone better knows whats up in this chip than I have figured here, then help us with that insight.
Looking at the inputs to the AD8333 Evaluation Board Circuit Diagram it shows that they each have a + / - input as if they are all balanced inputs? If this is so, I am seeing then that the input from the antenna to CH1 and CH2 will need to come from a toroid with two in phase secondary windings. The LO IN is depicted also as having what looks like a balanced input. And likewise may need to be fed with a toroid secondary. This I suppose then is the first thing to check on the breakout boards. The inputs all seem to be depicted in the evaluation board schematic as having "DC isolation capacitors" on each side of the presently "assumed" balanced inputs. So the toroid secondaries can not be such that they allow direct current to pass from the + to -. In figure 13 of the Analog Devices AD8333 PDF, the capacitors are depicted as CH1 = C22, C23, LO IN = C15, C16, CH2 = C19, C20. These inputs also look allot like Linear Integrated IC inputs? I don't think this is what this is. So I am thinking that these are hence balanced inputs with DC blocking isolation across them. The I/Q outputs also have two lines going out and this seems for Linear Integrated IC amplifiers in this case. So I guess when we get that far we will see what we have to do then. I need to go and look up the various IC types and become re~acquainted with which are what here. With Gilbert Cells I can easily imagine this being so, having balanced inputs and outputs. And we will then need two toroids for this IC. I have the ARRL HB on CD Rom here and can look up the Gilbert Cell and post that here. _____________________________________________________________________ PrivatePhone - FREE telephone number & voicemail. A number so private, you can make it public. http://www.privatephone.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/soft_radio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
