Technical Engineering Dictionary
"A" "B" "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

N to Nn, No to Nor, 'Not' to 'Nz'

Notch Filter. A filter designed to block a specific frequency range or band of frequencies. A band-stop filter [which shows a frequency pass-band graphic]. A notch filter may be passive or an active circuit using an amplifier, in this case an operational amplifier. This circuit example also provides a frequency adjustment using the variable resistor. See Notch Filter Design.

Active Notch Filter circuit using an Op Amp
Notch Filter

NOT Circuit. A binary circuit with a single output that is always the opposite of the input. Also called an Inverter Circuit. A TTL 7404, 7405, or 7414 inverter, or a CMOS 4069 hex inverter.

NPN. An NPN transistor is formed by introducing a thin region of P-type material between two regions of N-type material. [Transistor Terms] / [Transistor Manufacturers]

NPN Transistor Symbol

NRZ. See the definition of Non-Return-to-Zero Encoding, which also covers the encoding variations.

n-sequence. A pseudorandom binary sequence of n bits that is the output of a linear shift register and has the property that, if the shift register is set to any nonzero state and then cycled, a pseudorandom binary sequence of a maximum of n = 2m-1 bits will be generated, where m is the number of stages, i.e., the number of bit positions in the register, before the shift register returns to its original state and the n-bit output sequence repeats.

N-Type Material. A semiconductor material produced by doping an intrinsic semiconductor with an electron-donor impurity .

Null. No output. A balanced condition of a circuit that represents zero output, as in Off-Set Null of an Op Amp. The minimum output amplitude of a circuit. Read more on Off-Set Null Adjustment. On a polar-coordinate graph, the area that represents minimum or 0 radiation. Also refer to the section of Antenna Terms.

Op-Amp Off-Set Null Adjustment Circuit
Off-Set Null Adjust

Null Character. [NUL] A control character that is used to accomplish media-fill stuffing or a time-fill stuffing in storage device or in a data transmission line and that may be inserted and removed from a series of characters without affecting the meaning of the series. Also refer to the Table of ASCII characters.

Null Modem. A connector adapter or cable that cross connects the Tx and Rx lines of an RS232 interface. Null Modem Adapter and Pinout.

Number. A mathematical entity that may indicate quantity or amount of units. An abstract mathematical symbol for expressing a quantity. Also Hex.

Number Representation. The representation of numbers by agreed sets of symbols according to agreed rules. Also ASCII.

Number System. A number representation system. Any system for the representation of numbers. Also Base Number Conversion.

Numeral. A discrete representation of a number. For example, twelve, 12, XII, are three different numerals that represent the same number. A numeric word that represents a number.

Nyquist. A theorem that determines the minimum sampling rate of a signal. See Nyquist Sampling Rate

PC motherboard

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