# Glossary of EE Terms

### Term

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Radar warning receiver (RWR) systems detect the radio emissions of radar systems. Their primary purpose is to issue a warning when a radar signal that might be a threat (such as a police speed detection radar) is detected.

• ### Reconstruction Filter

An analog filter used to attenuate image frequencies found in the DAC output.

• ### Resistive Ladder Network (R-2R)

A resistor ladder network is an electrical circuit made of repeating units of precision resistors providing the function of dividing a reference voltage for the purpose of 1) coding comparison to the analog input voltage in an ADC, or 2) providing the code-related output in a DAC.

• ### Resistor Noise Voltage1 - eN_WB

Resistor Noise Voltage is random noise generated by internal resistors. It is characterized as a spectral density (voltage per root Hertz).

• ### Resistor Temperature Coefficient - RAB / T

Resistor Temperature Coefficient - (RAB / T) is a measure of the dependency of RAB's value on temperature. It is measured in ppm/°C which is found from (R/T)*(10^6/RAB).

• ### Resolution

In a data converter, the resolution is the number of bits in the binary word representing the analog signal; resolutions generally range from 6-bits to 24-bits. The higher the number of bits, the higher the resolution of the converter.

• ### Resolution - N

Resolution - N is a measure of the adjustability of the resistor value. To convert bits(N) to number of steps, simply do the following...steps = 2^N.

• ### Roll Axis

Roll axis is the X rotation axis in a 3D system. (See Figure 1)

• ### Rotation

Rotation can be defined as a single complete turn on an axis.

• ### RS-232

RS-232 (Recommended Standard 232) is the traditional name for a series of standards for serial binary single-ended data and control signals connecting between a DTE (Data Terminal Equipment) and a DCE (Data Circuit-terminating Equipment). The standard defines the electrical characteristics and timing of signals, the meaning of signals, and the physical size and pin out of connectors.

• ### RS-485/RS-422

RS-485 is a standard defining the electrical characteristics of drivers and receivers for use in balanced digital multipoint systems.

RS-422 provides for data transmission, using balanced or differential signaling, with unidirectional/non-reversible, terminated or non-terminated transmission lines, point to point, or multi-drop.

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