Help with interview question #1

[richardyue]

Hi, members,
I've some interview questions about digital circuit, VHDL and ASIC/FPGA. I think it's a good opportunity for us to discuss these questions. Maybe it's very helpful when we want to seek for jobs in the near future. The following is the first quesion.
Interview question #1:
What are the different Adder circuits you studied?
Here is my answer: Half Adder, Full Adder(Carry Ripple and Carry Look Ahead Adders). Members, what are your answers?

 

[wkong_zhu]

ripple & carry look ahead, etc

 

[uditkumar1983]

carry lookahead , Carry forward, ripple carry etc

 

[Willt]

carry lookahead, carry bypass

 

[svicent]

Serial adder, parallel adder

 

[blanket]

carry select
carry save
asynchronous adders

 

[satyakumar]

My answer

ripple carry adder
carry look ahead adder
carry save adder
carry select adder
carry bypass adder
square root carry adder
manchester carry look ahead adder

 

[aslijia]

to satyakumar:
what is the difference between your carry look ahead adder and your manchester carry look ahead adder?

 

[wangkl]

carry ripple adder
carry look-ahead adder
carry chain adder
carry skip adder
carry select adder
carry increment adder
conditional sum adder
tree adders
...

Refer to <CMOS VLSI design>
**broken link removed**
Ch.10 datapath subsystem
....

 

[shivakumar043]

1.Hybrid adder: Carry select adder, carry skip adder

 

[caplash_vlsi]

there are many types of adder implementations

ripple adder
carry look-ahead
carry save
carry skip
carry by-pass
caarry by-pass logarithmic

 

[rakesh1234]

carry ripple adder
carry look-ahead adder
carry chain adder
carry skip adder
carry select adder
carry increment adder
conditional sum adder
tree adders
...

Refer to <CMOS VLSI design>
h**p://www.aw-bc.com/info/weste/index.html
Ch.10 datapath subsystem
....