class-c amplifier
C2Technical
Definition
Meaning
A type of electronic amplifier in which the active device (e.g., transistor) conducts for less than half of the input signal cycle, resulting in high theoretical efficiency but significant signal distortion.
An amplifier design used primarily in radio frequency (RF) applications, such as signal transmission and oscillators, where its high efficiency is prioritized over faithful waveform reproduction.
Linguistics
Semantic Notes
It is a technical term belonging to the taxonomy of amplifier classes (e.g., class A, AB, D). It denotes an operational mode, not a physical product brand. Often used attributively (e.g., 'class-C operation').
Dialectal Variation
British vs American Usage
Differences
No lexical differences; the term is identical. Hyphenation style may vary (Class C amplifier vs. Class-C amplifier), but the hyphenated form is standard in technical literature.
Connotations
Identical technical connotation. Both regions associate it with high-efficiency, high-distortion RF amplification.
Frequency
Equally low-frequency in general discourse but standard in electronics and telecommunications engineering contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The [device] operates as a class-C amplifier.A class-C amplifier is used for [RF application].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Operating in class C”
Usage
Context Usage
Business
Rare; might appear in procurement specs for RF components.
Academic
Common in electrical engineering and telecommunications textbooks, research papers, and course materials.
Everyday
Virtually never used.
Technical
Standard term in electronics design, ham radio, and RF engineering documentation.
Examples
By Part of Speech
adjective
British English
- The class-C stage is followed by a filter.
- It uses a class-C configuration for the final RF power.
American English
- The design requires a class-C bias point.
- Class-C operation is not suitable for audio.
Examples
By CEFR Level
- Some radio transmitters use a class-C amplifier.
- This amplifier type is called 'class-C'.
- The primary advantage of a class-C amplifier is its high efficiency, often exceeding 80%.
- Due to its inherent distortion, a class-C amplifier must be used in conjunction with a tuned output network for RF applications.
Learning
Memory Aids
Mnemonic
Class-C Conducts Briefly: C for 'Curtailed' current flow.
Conceptual Metaphor
EFFICIENCY IS A SACRIFICE OF FIDELITY (The high efficiency is achieved by sacrificing accurate signal reproduction).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct calque 'класс-C усилитель' in very formal writing; the standard Russian term is 'усилитель класса C' (amplifier of class C).
- Do not confuse 'class' with the false friend 'класс' meaning 'quality'; here it's a technical classification.
Common Mistakes
- Incorrect capitalization: 'Class C Amplifier' is often acceptable, but 'class-C' is the most precise adjectival form.
- Omitting the hyphen can lead to ambiguity: 'class C amplifier' is parseable but less standard.
- Confusing it with digital class-D amplifiers.
Practice
Quiz
What is the main trade-off in a class-C amplifier design?
FAQ
Frequently Asked Questions
No, because it introduces severe distortion of the original audio waveform. It is unsuitable for any application requiring linear amplification.
It is efficient because the active device (transistor) is either fully on or fully off for most of the cycle, minimizing power dissipation. It spends zero time in the high-loss linear region.
They are predominantly used in radio frequency (RF) applications such as FM radio transmitters, TV transmitters, and RF oscillators, where the signal can be restored by a tuned output circuit.
Conduction angle. Class-A conducts 100% of the cycle, class-AB conducts more than 50% but less than 100%, and class-C conducts less than 50% of the input cycle.