## Submitted Questions

• #### Encoder, Mux, Decoder and Demux

What is difference between a multiplexer and encoder? also What is the between demultiplexer and decoder?

#### manoj

• Apr 2nd, 2015

Multiplexer is converted many signal to one signal by multipexing and encoder is encrypt single for sequrity.

demux and decoder is same work but opposite

#### hagos haftu

• Jan 14th, 2015

Yes it is very useful but as comment the description of the combination circuits should be supported by their practical circuits ,,,,the rest it is good

• #### Antenna Gain and Directivity

How can we increase the gain and directivity of an antenna?

#### abid saleem

• Mar 18th, 2013

Antenna gain relates the intensity of an antenna in a given direction to the intensity that would be produced by a hypothetical ideal antenna that radiates equally in all directions (isotropically) an...

#### uzipereg Profile Answers by uzipereg Questions by uzipereg

• Jul 30th, 2011

Geometry, direction for example.

• #### Antenna Length

Why length of antenna is taken as one half of wavelength or one fourth of wavelength? Why not one eighth or one sixteenth?

#### Deepak Rawat

• May 13th, 2016

Because, increasing antenna size greater than lemda gives increase in number of side lobes in field pattern. Which is not a good thing from the view of antenna directivity.

• #### 2 Input XOR Gate

How many 2:1 multiplexers do we need to make a 2 input XOR gate?

#### uzipereg Profile Answers by uzipereg Questions by uzipereg

• Jul 30th, 2011

A xor B= A'B + AB' hence, if A=0, then the output is B if A=1, then the output is B' so we need only ONE mux (2:1), which is controlled by A, and its inputs are B --> mux_in_0 ... Profile Answers by Suvarna Gadde Questions by Suvarna Gadde

• Dec 8th, 2010

To design the XOR using 2:1 mux, we need to tie the “Zeroth” input of mux to one of the input of XOR and another input of MUX to the inverted of first input. The another input of XOR gate ...

• #### Convert Binary to BCD

How can we convert a binary number into BCD number directly and vice-versa, without converting it into any other number system?

#### uzipereg Profile Answers by uzipereg Questions by uzipereg

• Jul 30th, 2011

It depends on the range. An algorithm can be used.

For a number in the range of 0 to 19 (decimal), the following algorithm can be used:

if a