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18f4550 usb
Helo all,
We are currently in a project involving data aquisition to a PC with the PIC 18F4550.
Data is send to the PC via USB port but PC must see a virtual comm port. Microchip offers standard library, CDC for doing so. Standard Windows driver is also used.
A simple program...
oscilloscope 20msps digital 100mhz analog
Does anybody has information or a brief tutorial on protections at the input stage of a oscilloscope? For a general instrument probably end users may apply out-of-range- voltages frequently.
Ian
As far as I know with a careful design, phase noise in a VCO is dominated by current source. I have seen a couple of designs were very large transistors are used in the current source to avoid flicker noise influence in phase noise.
Try to check the noise models you are employing. Sometimes...
Re: I/O Pads (with ESD)
As far as I know most commercial foundries provide library pads at no cost as a minimum. The problem usually is the documentation on these pads that is obscure regardin ESD in most cases.
Unless you require a very specific PAD, I strongly recommend you to ask the...
Re: Can you suggest a good book on "CMOS" device r
If you are a professional applications designer do not forget to read specific standards (I know IEEE has on latch up i.e.) for testing.
Re: CMOS
Other basic book for analog:
CMOS Analog Circuit Design
P.Allen, D.R.Holberg
Oxford University Press
ISBN 0-19-511644-5
There are some slides that correspond to a course based on this book in the forums.
Ian
Re: Current measurement
If it is helpfull, you can also add a dummy device to your circuit like a 0V DC source, or negligible resistor.
Some time ago I have worked on PSPICE 9 on defining custoim functions (like the current comparator you mention). I can search on my files (will take some...
Re: CMOS analog memmory
The list of non idealities is large, your question seems too general but do not forget to consider if some of the following affect your circuit:
- Charge injection
- kT/C noise
- charge time to your capacitor if your sampling rate is too large
- offset at your buffer...
Re: CMOS
In addition:
Stand-by probably sets the output in tri-state, more correctly referred as high impedance. At this state the node's voltage is not driven by your IC (an output with an extremely high impedance).
Also CMOS compatible nowadays has little meaning. It is just that the output...
Grounding strongly depend on your application so specify for an accurate response. Usualy inside an IC you provide both VCC and GND lines as thick as possible, however for example in a micropower application this loose sense.
As far as I know is not a usual practice to provide a full gnd plane...
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