help..

Thread Starter

shivanibindu

Joined Jan 16, 2012
5
i am a beginner in LTspice and wish 2 do a 10 bit adder circuit.
so plz.. anyone explain me how could i declare a single bit component as my on.
actually i had don one bt itz not wrkng, while running it shows "node missing". n am using LTspiceIV.
 

RRITESH KAKKAR

Joined Jun 29, 2010
2,829
You must be using 74xx or 40xx series chip in spice so, it would require spice directory for that.
something like this .inc 74hc.lib and .inc CD4000.lib
 

Thread Starter

shivanibindu

Joined Jan 16, 2012
5
hi rritesh...
srry.. i dnt get that. In spice directive v hav 2 specify the file path, rgt??
n the error shown is "unknown controllng source n002".
can u plz help..
am nt so familr wth spice.
 

joeyd999

Joined Jun 6, 2011
4,268
hi rritesh...
srry.. i dnt get that. In spice directive v hav 2 specify the file path, rgt??
n the error shown is "unknown controllng source n002".
can u plz help..
am nt so familr wth spice.
Why do you want us to work so hard trying to interpret your l33t speak???
 

MrChips

Joined Oct 2, 2009
19,382
hi rritesh...
srry.. i dnt get that. In spice directive v hav 2 specify the file path, rgt??
n the error shown is "unknown controllng source n002".
can u plz help..
am nt so familr wth spice.
As a new member there are some rules you have to learn.

1) Never post a title such as "help..". Express yourself clearly as to what the topic is about.

2) Write clear English, not textese. Make sure you can be understood.
 

Thread Starter

shivanibindu

Joined Jan 16, 2012
5
sorry sir, its my mistake i regret deeply for it.

I wish to compare the performance of a CMOS 10 bit ripple carry adder and a CMOS 10 bit carry look-ahead adder. But i am unable to declare CMOS single bit full adder as a component . So would you please help me to solve this problem ?.
 

RRITESH KAKKAR

Joined Jun 29, 2010
2,829
I wish to compare the performance of a CMOS 10 bit ripple carry adder and a CMOS 10 bit carry look-ahead adder. But i am unable to declare CMOS single bit full adder as a component . So would you please help me to solve this problem ?.
I have already said use 74xx or 40xx adder chip, using MOS will be more complicated.
The chip work on GND and Vcc(5V) but in MOS this not true.
Different MOS require diff gate voltages.
 
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