Oscilloscope Glossary

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Term Definition
CAN bus

Controller Area Network -  bus system used in automotive and other applications

CAN FD

Controller Area Network with flexible Data-Rate - automotive bus system

CMRR

common-mode rejection ratio

Common mode voltage

Voltage of the same polarity on both differential inputs relative to ground.

Common-Mode Rejection Ratio

CMRR - measure for the rejection of unwanted input signals common to both inputs. An ideal differential amplifier should have a very high CMRR.

cPCI

compact PCI (Peripheral Component Interconnect) - computer bus used for connection of peripherals in a PC.

D-PHY

MIPI Physical Layer Specification - this is the first specification developed by MIPI primarily to support camera and display applications. More information see www.mipi.org.

D/A

Digital-to-Analog-converter. Converts a digital information into an analog signal.

DAC

Digital-to-Analog-Converter.

dB

Decibel - Logarithmic unit (to base 10) to express the ratio of two values of a signal.

dBc

Decibels relative to the carrier.

DC

direct current = unidirectional flow of electric charge.

DDR

Double Data Rate - used e.g. in memory chips

de-embedding

Mathematical process to remove the effects of structures needed for the measurement (e.g. fixture) from the measured data.

dead time

After each signal acquisition the oscilloscope needs some time for processing and analysis of the captured data. After that time the scope can again start to aquire new data. The time between these acquisitions is called blind time or dead time.

Decibel

Decibel (dB) - Logarithmic (to base 10) measure to express the ratio of two signal levels.

distortion

Normally unwanted alteration of a signal or waveform e.g. deformation of amplitude, phase, frequency response or adding harmonics.

drift

Unwanted change of an output over a period of time.

DSO

Digital Storage Oscilloscope

DUT

Device unter Test