Linux tricks :

multiple commands can be given together using &&

eg - if u want to go 3 directory back use 

>> ... && ..

PERL :

 Important points :

1. All the content in () is read in $1 .

2. If you are reading a value in $1 consecutively one after the other , but the 2nd one is based on some condition ; in that case even if the condition is not met it will take value for $1 from the 1st =~ . 

To clear $1 we can do something like this :

my $tmp = "";

$tmp =~ /(.*)/;

3. for creating as well as copying sub folders use -r with cp cmd , only cp folder_name/* wont work .

3. Creating hash of hash automatically on reading data from a file :

In hash of hash we have key1 > key2 > value 

that is why we cannot access key2 as <hash name>{key1}

4.  $hash{$1} : this doesn't work , take the $1 in some var and then use as key of hash .

While making transmission gate switch don't short source and body because in TG source and drain change according to the input and output values .

Random :

1. coupling capacitors act as short ciruit at all frequencies (as they have very high capacitance ) and open circuit at dc only .
2. To find out the current gain in cadence plot the output current and then only do the ac analysis .
 

SRAM design :

initial stored value 0.9 on both




 Write 1 operation then precharge and then read 1