Page 193 - FUNDAMENTALS OF COMPUTER
P. 193

NPP               Number System, Boolean Algebra and Logic Circuits              193


                      Bubbled OR and  NOT Gates  can be           ~~ëS> OR VWm NOT JoQ>m| H$mo NAND _| ~XbZo
                  converted into NAND:                        na:

                                        A
                                        B








                       Problem 3.48                                àíZ 3.48
                      Implement XNOR gate using NOR gates:        XNOR  JoQ> H$mo  NOR  JoQ>m|  H$s  ghm`Vm go
                                                              ~ZmAmo:
                  Solution:                                   hc:

                      The  symbol  and output  expression for     XNOR JoQ> H$m g§Ho$V VWm CgH$m gyÌ {ZåZmZwgma h¡…
                  XNOR gate is:       NPP

                                             A

                                             B                      Y = A.B + A.B

                      The expression can be simplified in POS     Bgr g_rH$aU H$mo  POS  ñdê$n _|  {ZåZmZwgma
                  form as follows:                            Xem©`m Om gH$Vm h¡…

                                                    Y = (A+ B ) (A.  +  ) B
                      The Basic gate circuit is:                  _yb^yV JoQ>m| go n[anW ~ZmZo na:

                                     A
                                     B


                                                                                   Y



                      Convert OR gates into NOR gates:            XmoZm| OR JoQ>m| H$mo NOR _| ~XbZo na…

                                    A

                                    B

                                                                                   Y
   188   189   190   191   192   193   194   195   196   197   198