Electronics Forum / CAD / February 2007

NON-POLITICAL Announcement...
My *7th* grandchild is now in the hopper !-)
Courtesy of my oldest son, who I thought was never going to have any
children.

I am Palash working on wireless global ckock distribution. I have
completed most of the job except a comparator. I have to design it
using 0.18u TSMC process, frequency of the signal that will be used in
comparator is about 3GHz. I need urgant help to design this circuit.

I'm doing my first PCB design.  I'm an EE, but I am not familiar with many
of the practical aspects of PCB fab.  I have IPC-2221 and a couple of other
documents like it, and have done some searches, but so far I haven't found
an explicit answer to this question.

I'm trying to get a feel for what pcb design rules to use. I have
found various manufacturers sites which define their minimum track,
gap and drill size but I'm trying to work out in what order I should
be reducing each of these to get my pcb routed.

Hi,  Can anyone recommend a fairly simple CAD program that I can us
to draw basic circuits.  I just want to be able to 'grab' variou
components like resistors, capacitors, leds, relays etc and wire the
together

for a while now I have been doing double sided layouts and single sided
boards - with the component traces tracked with jumper wire.
I am now trying to do a TRUE double sided board and I wondered how you
folks handled vias?

I'm offering a conversion service for files from an extinct schematic
program by OMATION called SCHEMA III. It was very popular in the
1980's and arguably the best of the DOS programs.
I can convert these files and libraries to Altium PCAD and Designer

I have spent too much time trying to figure out how to move components
between
sheets in the schematic, without ripping up the previously made routes
in the

Ask anyone designing low-power ICs what they really want. They are
most likely to say a standard for describing low-power design
requirements.
With the ever-increasing demand for less power consumption by

How can I set a voltage source based on a measured voltage?
For example, take 2 simple loops.
I'd like to set V3 to 5 times V2
Loop 1: V1(10 volts) to V2(0 volts) to R1(100ohm) to ground.

I'm trying to model a dc motor and would like to convert the example
found at:
http://www.ecircuitcenter.com/Circuits/dc_motor_model/DCmotor_model.htm
to a ltspice symbol and subcircuit.

I am looking for a tool that helps to reverse-engineer old PCBs full of
TTL/CMOS ICs. Something graphical.
The ideal program would let me place the parts [which should be in a
database already :-)] and enter the pin connections. The program then

Went into PC Club today to pick up some more RAM.
They told me that they would have Laptops available with XP for
another month.
                                       ...Jim Thompson

Does anyone know how I could interface the database from my inventory to a
part field in Protel so that when a Schematic is being laid out I can select
the appropriate part number ?
Thanks in advance

Since I have to do a largish schematic and won't be in the office the
whole time I wanted to connect my trusty old trackball to a laptop. This
old mouse still boasts a, gasp, 9-pin serial connector. But you know how
it is, when you get used to a tool no matter how ancient you ...