Glossary

AC: Alternating current; term used generically to describe any sinusoidal signal.
ADC: Analog-to-digital converter.
AM: Amplitude modulation.
AM-AM: Term used to describe gain compression in an amplifier, whereby a given increase in input signal results in a different change in the output level.
AM-PM: Amplitude modulation to phase modulation; a distortion process in a power amplifier, whereby increasing signal amplitude causes additional output phase shift.
ACP: Alternate channel power; term used more generally to describe the spectral distortion of spread spectrum signals, which appear as continuous bands.
AGC: Automatic gain control.

BER: Bit error rate; a measure used to quantify the transmission integrity of a digital communications system.
BJT: Bipolar junction transistor.

CAD: Computer-aided design.
CDMA: Code division multiple access; a digital communications system which chips multiple signals in a pseudo-random fashion, making them appear like random noise unless a specific coding is applied.
CFR: Crest factor reduction. The process by which the PAR of a signal is reduced by digital means.

ECM: Electronic countermeasures; a generic term for military broadband microwave applications.
EDGE: Enhanced Data rates for GSM Evolution; an evolution of the GSM system, providing data rates up to 384 kbit/sec.
EER: Envelope Elimination and Restoration.
EPA

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RF Power Amplifiers for Wireless Communications, Second Edition