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Non linear nature of the channel is portrayed in eye pattern by asymmetric shape of eye

Schmitt trigger are also called as squaring circuit because, this type of circuit converts an irregularly shaped wave to a square wave or pulse.

To limit the output voltage swing to positive or negative direction, the basic op-amp comparator should be connected with a combination of zener and rectifier diode in the feedback path.

A comparator is some time called as voltage level detector because, for a desired value of reference voltage, the voltage level of the input can be detected.

In 8 bit binary format, only 100 out of 256 is valid BCD codes.

EXNOR Gate: Also known as the XNOR gate, it outputs true or 1 when the number of true inputs is even (including zero).
It performs the complement of the XOR operation.
NOR Gate: Outputs true or 1 only when all inputs are false or 0.
It is the complement of the OR gate.
The output of the EXNOR gate or NOR gate or NAND gate is Logic High when both the inputs are Logic Low.

2 multiplexers are required to implement a half adder
Half Adder we need two multiplexers the first multiplexer produces sum output and the second MUX generates the carry output of the Half Adder. X and Y are the two selection inputs to both multiplexers to select a particular input.

CMOS has high packing density

Rake receiver is a bank of Correlation receivers

Multipath fading can be avoided by use of Rake receiver.

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