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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoPlainText>John,<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Here is the layer stack-up to match both the needs of the Si5345 D (6-layer) and the thickness of the M.2 board (0.8mm) using 1oz copper. It still fits one of the standard low cost variants from 4pcb.com. If we use a different PCB house, it will be easy to change. As far as I can tell, the Si5345 D documentation uses no blind or buried vias, so we will still meet the low cost requirements.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><img width=783 height=302 style='width:8.1562in;height:3.1458in' id="Picture_x0020_1" src="cid:image002.jpg@01D5713A.E9749070"><o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Rick<o:p></o:p></p><p class=MsoPlainText>W2GPS<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>-----Original Message-----<br>From: Rick - W2GPS <w2gps@cnssys.com> <br>Sent: September 21, 2019 5:00 PM<br>To: 'TAPR TangerineSDR Modular Software Defined Radio' <tangerinesdr@lists.tapr.org><br>Cc: 'John Ackermann N8UR' <jra@febo.com><br>Subject: RE: [TangerineSDR] TangerineSDR Board Sizes and Mock-up</p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>John,<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>I noticed the various layout examples in the SiLabs 53xx documentation but I did not notice the 6-layer requirement. At present, the board stack is 4-layer, 80mm (0.31") thick to match the M.2 specification. It is set up to match the stack-up requirements for standard configuration from low cost board houses like 4pcb.com. I just checked and it will be easy to change this to 6-layer, 80mm (0.31") thick board while staying within their low cost board structure.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>I will need to find a low cost TCXO for the base configuration. The OCXO I show is well over $100 in 50-piece quantity. It can get to twice that if over specified. I hope the footprints can be overlaid to save room.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>The board size will be a challenge, I'm sure.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Rick<o:p></o:p></p><p class=MsoPlainText>W2GPS<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>-----Original Message-----<o:p></o:p></p><p class=MsoPlainText>From: TangerineSDR <<a href="mailto:tangerinesdr-bounces@lists.tapr.org"><span style='color:windowtext;text-decoration:none'>tangerinesdr-bounces@lists.tapr.org</span></a>> On Behalf Of John Ackermann N8UR via TangerineSDR<o:p></o:p></p><p class=MsoPlainText>Sent: September 21, 2019 4:43 PM<o:p></o:p></p><p class=MsoPlainText>To: <a href="mailto:tangerinesdr@lists.tapr.org"><span style='color:windowtext;text-decoration:none'>tangerinesdr@lists.tapr.org</span></a><o:p></o:p></p><p class=MsoPlainText>Cc: John Ackermann N8UR <<a href="mailto:jra@febo.com"><span style='color:windowtext;text-decoration:none'>jra@febo.com</span></a>><o:p></o:p></p><p class=MsoPlainText>Subject: Re: [TangerineSDR] TangerineSDR Board Sizes and Mock-up<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Thanks, Rick. I've finally started paying attention and have been thinking about some unique GPSDO ideas. They may change the physical parts a bit but we're a long way from having anything finalized.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>I think we've concluded that the RF output from the M8F module is not acceptable for RF use -- it has a very ugly dither pattern so we will likely need a external (TC)(OC)XO and DAC no matter what architecture we end up with.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>One thing to note: the SiLabs 53xx chip wants a 6 layer board and also has some fairly funky layout requirements; a bunch of this is due to crosstalk reduction, and the 48 MHz crystal used as the cleanup oscillator. The chip is physically small, but pretty complex to lay out.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>73,<o:p></o:p></p><p class=MsoPlainText>John<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>On 9/21/19 4:24 PM, Rick - W2GPS via TangerineSDR wrote:<o:p></o:p></p><p class=MsoPlainText>> All,<o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText>> I have been working on the clock module to see if the proposed size for the clock module is reasonable. Attached is a 3D top view showing major components. Not shown is the D/A to drive the OCXO and various minor components. These may wind up on the bottom of the board.<o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText>> Rick<o:p></o:p></p><p class=MsoPlainText>> W2GPS<o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText>> -----Original Message-----<o:p></o:p></p><p class=MsoPlainText>> From: TangerineSDR <<a href="mailto:tangerinesdr-bounces@lists.tapr.org"><span style='color:windowtext;text-decoration:none'>tangerinesdr-bounces@lists.tapr.org</span></a>> On Behalf Of <o:p></o:p></p><p class=MsoPlainText>> Scotty Cowling via TangerineSDR<o:p></o:p></p><p class=MsoPlainText>> Sent: September 17, 2019 11:50 AM<o:p></o:p></p><p class=MsoPlainText>> To: TAPR TangerineSDR Modular Software Defined Radio <o:p></o:p></p><p class=MsoPlainText>> <<a href="mailto:tangerinesdr@lists.tapr.org"><span style='color:windowtext;text-decoration:none'>tangerinesdr@lists.tapr.org</span></a>><o:p></o:p></p><p class=MsoPlainText>> Cc: Scotty Cowling <<a href="mailto:scotty@tonks.com"><span style='color:windowtext;text-decoration:none'>scotty@tonks.com</span></a>><o:p></o:p></p><p class=MsoPlainText>> Subject: [TangerineSDR] TangerineSDR Board Sizes and Mock-up<o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText>> Here is a sneak preview of part of the TangerineSDR talk I will be giving at DCC on Saturday.<o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText>> Rick, this should be enough information on the PCB sizes to figure out if we have enough room or not.<o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText>> The CKM can be extended downward and/or to the right (when looking at the assembly with the RPi I/O connector on top). We may have to make the DE board larger anyway, if our CAD guy needs more routing room.<o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText>> 73,<o:p></o:p></p><p class=MsoPlainText>> Scotty WA2DFI<o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText>> <o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>--<o:p></o:p></p><p class=MsoPlainText>TangerineSDR mailing list<o:p></o:p></p><p class=MsoPlainText><a href="mailto:TangerineSDR@lists.tapr.org"><span style='color:windowtext;text-decoration:none'>TangerineSDR@lists.tapr.org</span></a><o:p></o:p></p><p class=MsoPlainText><a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org"><span style='color:windowtext;text-decoration:none'>http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</span></a><o:p></o:p></p></div></body></html>