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Hi,
Not sure if this is the correct subforum.
If we have a CMOS discrete logic circuit being used to transmit unipolar signals at 18Mbits/s along a 75ohm coaxial, 1metre in length, to a correctly terminated BNC, then there will be no reflections.
If we assume that the coaxial cable has been...
Hi,
As an update, the equation provided was not derived - and was referred to another book. It seems that whether the pole has a negative or positive slope, it is still a pole, and the equation represented the low frequency behaviour only.
Regards,
Shadders.
Hi,
I understand from a qualitative approach that a low frequency "knee" can be seen as a pole if the frequency is reversed. What i was looking for is the mathematics behind why a zero can be represented as a pole.
I do have a text (Analysis and Design of Analog Integrated Circuits) which has...
Hi,
I have been examining Open Circuit Time Constants (OCTC) from a text book, and then the next section is on Short Circuit Time Constants (SCTC). For SCTC, the discussion is on the lower frequency cut off due to the zeros, and refers to a text (book) that I don’t have.
I am unsure why, but...
Hi Klaus,
Thanks - yes i looked at a precision galvanometer and the best i could locate is one with 270uV/div sensitivity - so as you have indicated - insufficient.
The best i could attain is approximating a lower bit depth - 18 or 19 bits.
Thanks for your replies - it seems that it is not...
Hi FvM,
I recall Philips used to produce a sign magnitude DAC - 24bit with laser trimmed resistances - but they are not produced anymore and remaining stock is sold for in excess of £50.
Digital correction tables - had not considered that before - but i assume that you will need precision...
Hi Klaus,
Thanks for the reply.
This is a hobby based project - so some of the issues you have raised are not an serious issue.
For the ON resistance - i located a low on resistance analogue switch, and the voltage used is relatively low which is 5volts. So i will not be too bothered by the...
Hi,
I am looking to match resistors with a very high degree of accuracy/tolerance.
One can purchase 0.01% resistors quite easily, but with regards to a project such as an R-2R ladder DAC, which has 24bit depth, then the accuracy/tolerance would have to be 0.000005%.
Since such a tolerance is...
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