[Halld-tagger] Fwd: Tagger microscope amplifier board files
Richard Jones
richard.t.jones at uconn.edu
Mon Jun 20 18:19:43 EDT 2011
Fernando,
Agreed, we should do this. Thank you for your work on this. We will try to quickly turn this revision around and get a prototype populated within a few weeks.
-rtj
On 6/17/2011 10:23 PM, Fernando J. Barbosa wrote:
> Hi Alex,
>
> I forgot to mention this on my previous email. I suggest that you layout
> a prototype circuit to include 5 channels and a sum circuit to verify
> that it performs as intended before committing to a final complete PCB.
>
> Best regards,
> Fernando
>
>
>
> Fernando J. Barbosa wrote:
>> Hi Alex,
>>
>> I have attached a zip file containing an example layout for your
>> reference. I extracted the schematics from the files that Igor sent me
>> but is an exact functional replica. These include one amplifier
>> channel and the summing circuit of 5 channels.
>>
>> The layout is intended to minimize the signal path length which
>> improves signal integrity but at the expense of channel width. The
>> height is reduced, though.
>>
>> I have added layers with copper pours rather than using planes. This
>> is better for visualization purposes but you may choose to use planes,
>> instead. There are 6 layers in these sample layout with extensive
>> ground planes and one solid VCC plane. These facilitate direct
>> connections of GND or VCC pads.
>>
>> I used Mid-Layer 2 to route the input and output signals to and from
>> the sum circuitry. The other 4 inputs to the sum input should be
>> routed to the sum pad in a similar manner, a star configuration.
>>
>> I used Mid-Layer 4 to route the SiPM outputs which will connect to the
>> output connector. Other traces for gain setting, etc (basically DC)
>> may be routed on one of the poured GND layers but be sure to avoid
>> crossing, as much as possible and at 90 degrees, sensitive traces.
>> Also, make any of these DC bias, etc wide (25 or 50 mil).
>>
>> When you step-and-repeat the amplifier channels make sure that you
>> have enough GND between the channels to minimize cross-talk. It is
>> also possible to move components to the bottom layer if you need to
>> compact the layout a bit more but this will increase complexity during
>> assembly.
>>
>> I hope this helps. Thanks for your patience and best regards,
>> Fernando
>>
>> P.S. If you need me to check your design at a later date, please
>> create and include an integrated library file. This makes things a lot
>> easier for me.
>>
>>
>> Alex Barnes wrote:
>>> Hi Fernando,
>>>
>>> Thank you for your help.
>>>
>>> Sincerely,
>>> Alex Barnes
>>>
>>> On Mon, Jun 6, 2011 at 9:04 AM, Fernando J. Barbosa<barbosa at jlab.org
>>> <mailto:barbosa at jlab.org>> wrote:
>>>
>>> Hi Alex,
>>>
>>> Sorry for the delay. I was off last week and I did not have access
>>> to my PC. I will have a sample channel layout by the end of this
>>> week which should allow you to proceed with the layout of the full
>>> readout front end.
>>>
>>> Best regards,
>>> Fernando
>>>
>>>
>>>
>>>
>>> Alex Barnes wrote:
>>>
>>> Hi Fernando,
>>>
>>> We haven't met but I'm Alex Barnes, a new graduate student
>>> working in Dr. Jones' lab on the SiPM amplifier layout. This
>>> summer I'll be analyzing the current amplifier board and
>>> working in Altium on a new board. Would you happen to have
>>> anything I could look at for the new board?
>>>
>>> Thank you,
>>> Alex Barnes
>>>
>>> On Tue, May 3, 2011 at 4:34 PM, Igor Senderovich
>>> <senderovich at phys.uconn.edu
>>> <mailto:senderovich at phys.uconn.edu>
>>> <mailto:senderovich at phys.uconn.edu
>>> <mailto:senderovich at phys.uconn.edu>>> wrote:
>>>
>>> Hi Fernando,
>>>
>>> I hope this finds you well.
>>> Have you had a chance to play with the microscope SiPM
>>> amplifier
>>> layout? A student in our group, Alex Barnes, will begin
>>> working on
>>> the project in the next few weeks as the summer is
>>> beginning and
>>> we thought he can have some suggestions or base design from
>>> you.
>>>
>>> Please let us know.
>>> All the best,
>>> -Igor
>>>
>>>
>>> On 3/29/2011 10:20 AM, Fernando J. Barbosa wrote:
>>>
>>> Hi Igor,
>>>
>>> Thanks for the update. I plan to start working on a
>>> sample,
>>> single channel layout later this week.
>>>
>>> Best regards,
>>> Fernando
>>>
>>>
>>> Igor Senderovich wrote:
>>>
>>> Hi Fernando,
>>>
>>> It just occurred to me regarding the Altium files I
>>> sent you
>>> with the tagger microscope amplifier design, that
>>> it may not
>>> have been updated since a fix done later on when
>>> testing a
>>> manufactured piece on the bench.
>>> Here is the most current circuit:
>>>
>>> http://zeus.phys.uconn.edu/wiki/images/AmpCircuit_v7_DC.png
>>> We reversed polarity to PNP of transistor 'm' (5th
>>> transistor
>>> from the left) I think the Alium files may not
>>> reflect this change.
>>>
>>> Please let me know if you find any other issues or
>>> discrepancies.
>>> Thank you,
>>> -Igor
>>>
>>>
>>> On 3/14/2011 10:26 AM, Igor Senderovich wrote:
>>>
>>> Hi Fernando,
>>>
>>> Did you get and were you able to open the files
>>> I sent you with
>>> the e-mail below?
>>> Let me know if you need any other material to
>>> work with our
>>> amplifier design.
>>>
>>> All the best and many thanks for your help,
>>> -Igor
>>>
>>>
>>> On 3/9/2011 10:54 AM, Igor Senderovich wrote:
>>>
>>> Hi Fernando,
>>>
>>> I am resending the tagger microscope
>>> amplifier package. It
>>> should have all the Altium stuff and files
>>> for procurement.
>>>
>>> Thank you for all your help with this,
>>> -Igor
>>>
>>>
>>> -------- Original Message --------
>>> Subject: Tagger microscope amplifier
>>> board files
>>> Date: Wed, 13 Oct 2010 15:38:46 -0400
>>> From: Igor Senderovich
>>> <senderovich at phys.uconn.edu
>>> <mailto:senderovich at phys.uconn.edu>>
>>> <mailto:senderovich at phys.uconn.edu
>>> <mailto:senderovich at phys.uconn.edu>>
>>> <mailto:senderovich at phys.uconn.edu
>>> <mailto:senderovich at phys.uconn.edu>>
>>> Reply-To: senderovich at phys.uconn.edu
>>> <mailto:senderovich at phys.uconn.edu>
>>> <mailto:senderovich at phys.uconn.edu
>>> <mailto:senderovich at phys.uconn.edu>>
>>> <mailto:senderovich at phys.uconn.edu
>>> <mailto:senderovich at phys.uconn.edu>>
>>> To: Fernando J. Barbosa
>>> <barbosa at jlab.org<mailto:barbosa at jlab.org>>
>>> <mailto:barbosa at jlab.org
>>> <mailto:barbosa at jlab.org>>
>>> <mailto:barbosa at jlab.org
>>> <mailto:barbosa at jlab.org>>
>>>
>>>
>>>
>>>
>>> Dear Fernando,
>>>
>>> I am sending you the files associated with
>>> the SiPM amplifier
>>> board we discussed today.
>>>
>>> * *AmpBoard.zip* contains the entire
>>> project that our
>>> student,
>>> Mitchell "Woody" Underwood, compiled
>>> at the time of the
>>> board
>>> layout. It should have the Altium
>>> files and all the
>>> materials
>>> submitted during PCB manufacturing
>>> and population. Spec.
>>> sheets on our SiPM and Transistors is
>>> included there as
>>> well.
>>> * *SignalAnalysis.zip* has some traces
>>> and response
>>> function plots
>>> o _Response functions_: there is
>>> a pdf with a plot
>>> of the
>>> modeled response function and
>>> another with the
>>> measured
>>> response (based on injected
>>> sine waves, not with SiPM
>>> pulses) The measurements were
>>> done at the low gain
>>> setting, which is the critical
>>> one for normal
>>> microscope
>>> running.
>>> o _Traces_: You will find some
>>> BMP files with
>>> oscilloscope
>>> captures. Almost all of them
>>> (green trace) are of the
>>> output from the summing circuit
>>> with only one channel
>>> on. One plot has the output of
>>> the single channel
>>> (i.e.
>>> signal extracted before summing
>>> circuit) in blue for
>>> comparison. An accompanying
>>> README file explains the
>>> file-naming notation to
>>> describe the conditions of
>>> the
>>> measurement.
>>>
>>> One, sort of cross-talk-related issue I
>>> didn't mention is that
>>> there is a noticeable change in the summed
>>> pulse shape
>>> depending on whether the individual
>>> channels read. We have
>>> separate emitter followers for the outputs
>>> so we expected them
>>> to be well-buffered. The different trace
>>> captures compare the
>>> shapes based on what is plugged in.
>>>
>>> Thank you very much, Fernando, for you input.
>>> All the best,
>>> -Igor
>>>
>>>
>>>
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