Glossary of EE Terms
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Radar Warning Receiver (RWR)
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.
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Reconstruction Filter
An analog filter used to attenuate image frequencies found in the DAC output.
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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.
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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).
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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).
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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.
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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.
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Roll Axis
Roll axis is the X rotation axis in a 3D system. (See Figure 1)
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Rotation
Rotation can be defined as a single complete turn on an axis.
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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.
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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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