Question
What are the different adder circuits you studied?
Answers
Adders are generally of five types:
1) Ripple Carry Adder: The Ripple carry adder(RCA) consists of a building block named Half Adder(HA) which is cascaded to form a Full Adder(FA). These building blocks HAs and FAs are also the building blocks of all types of adders.The n full adders are cascaded to form n bit RCA.
The full adder has three input pins(input Ai,input Bi,carryin Ci) and two output pins(Sum and Ci+1).Its equations are:
Sum=Ai^Bi^Ci
Ci+1=Ai.Bi+Bi.Ci+Ai.Ci
2)Carry Lookahead Adder: The Carry Lookahead Adder(CLA) reduces the delay as that in RCA. Let
Gi=Ai.Bi, and Pi=Ai^Bi, then Ci+1=Gi+Pi.Ci.
The expressions for Sum and Ci+1 is then defined completely in terms of input pins rather wait for input carry to appear.
3)Carry Select Adder: The carry select adder uses duplicate modules for each combination of input carry(i.e. 1 and 0).The multiplexers then select the appropriate sum and carry output according to the carry output of the preceding stages.   Your Comment




  • Contributors: *,


Search
Can you Answer!!
  • Q Which Prime Minister of India dedicated the Sampoorna Gramin Rozgar Nana to the nation:
  • Q What was the codename of the Iraqi agent who admitted lying to US intelligence services about the existence of weapons of mass destruction, and providing US/UK justification for the Iraq War?
  • Q In business what does the abbreviation ROCE stand for?
  • Q Mention the family, order of Lemon shark Fish?
  • Q How ______ is it since you left your house?
  • Q Define Culture and its major Characteristics; also discuss how the discipline of Anthropology is different from other Social Sciences?
  • Q Which part of Brain is called “Small Brain”?
  • Q When did IBM introduced the first 8″ floppy disk? How much it could store?
  • Q Define Cellulase.
  • Q Having the DB Check point, its able to show the current values in form but its not showing the values that saved in the table
  • Q In how many ways we can track the sessions?