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| Invention | Inventor | Year | Patent No. |
| Amplifiers | | | |
| Amplifiers in Cascade | | | |
| Audio Power Amplifier | | | |
| Audio Voltage Amplifier | | | |
| Bridged and Paralleled Amplifiers | | | |
| Buffer Amplifier | | | |
| Class A Amplifier | E. (ERNST) F.W. Alexanderson | 1913 | US1,173,079 |
| Class AB Amplifier | | | |
| Class B Amplifier | Loy Barton (RCA) | 1931 | |
| Class BD Amplifier | Robert B. Herbert | 1971 | US3,585,517 |
| Class C Amplifier | | | |
| Class D Amplifier (PWM) | R. L. Bright | 1954 | US2,821,639 |
| Class E Amplifier | Nathan O. Sokal
Alan D. Sokal | 1972 | |
| Class F Amplifier | | | |
| Class G Amplifier | Hitachi | 1977 | |
| Class H Amplifier | Manuel Kramer (NASA)
Soundcraftsmen | 1964
1977 | US3,319,175 |
| Class I Amplifier (BCA: Balanced Current Amplifier) | Gerald R. Stanley | | US5,657,219 |
| Class S Amplifier | | 1932 | |
| Common Base Amplifier | | | |
| Common Collector Amplifier | | | |
| Common Drain Amplifier | | | |
| Common Emitter Amplifier | | | |
| Common Gate Amplifier | | | |
| Common Source Amplifier | | | |
| Complementary Push-Pull Amplifier | G. C. Sziklai | 1953 | US2,762,870
US2,791,644 |
| Darlington Pair | Sidney Darlington (Bell Laboratories) | 1953 | US2,663,806 |
| Differential Amplifier | Otto Herbert Schmitt | 1937 | Never Patented |
| Directly Coupled Amplifier | | | |
| Feedback (Negative) Amplifier | Harold Black | 1927 | US2,102,671 |
| Grounded Bridge Amplifier | Crown International | 1971 | |
| Headphone Amplifier | | | |
| Instrument Amplifier | | | |
| Instrumentation Amplifier | | | |
| Intermediate Frequency Amplifier | | | |
| Intermediate Power Amplifier | | | |
| Low Noise Amplifier (LNA) | | | |
| Low-Noise Block Converter (LNB) | | | |
| Magnetic Amplifier | | | |
| Operational Amplifier | | | |
| Preamplifier | | | |
| Push-Pull Amplifier | Edwin H. Colpitts | 1912 | |
| Quasi-Complementary Amplifier | Hung Chang Lin | 1955 | US2,896,029 |
| PWM Amplifier (Class D) | R. L. Bright | 1954 | US2,821,639 |
| Radio Frequency Amplifier | Lee De Forest | 1907 | |
| Small Signal Amplifier | | | |
| Smokey Amplifier | Bruce Zinky | 1980s | |
| Transimpedance Amplifier | | | |
| Traveling Wave Tube (TWT) Amplifier | Rudolph Kompfner | | US2,811,673 |
| Tuned Amplifier | | | |
| Video Amplifier (Image Dissector) | Philo Taylor Farnsworth | 1927 | US2,087,683 |
| Wide Band Amplifier | | | |
| Williamson Amplifier | D.T.N. Williamson | 1947 | |
| Fiber Optic Amplifier | John Shaw (Northrop Grumman)
Michel Digonnet (Northrop Grumman) | | |
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