H03F 1/02
Modifications of amplifiers to raise the efficiency
Official title: Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H03F1/02 (Modifications of amplifiers to raise the efficiency) appears on 7,916 US grants and 8,254 published applications in this corpus.
Search patents in H03F- Granted patents
- 7,916
- Published applications
- 8,254
- Assignees
- 1,460
- Inventors
- 9,470
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 8 | 0 |
| 1978 | 10 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 5 | 0 |
| 1982 | 16 | 0 |
| 1983 | 5 | 0 |
| 1984 | 28 | 0 |
| 1985 | 15 | 0 |
| 1986 | 15 | 0 |
| 1987 | 10 | 0 |
| 1988 | 9 | 0 |
| 1989 | 10 | 0 |
| 1990 | 16 | 0 |
| 1991 | 27 | 0 |
| 1992 | 28 | 0 |
| 1993 | 19 | 0 |
| 1994 | 23 | 0 |
| 1995 | 31 | 0 |
| 1996 | 31 | 0 |
| 1997 | 17 | 0 |
| 1998 | 38 | 0 |
| 1999 | 47 | 0 |
| 2000 | 69 | 0 |
| 2001 | 66 | 20 |
| 2002 | 68 | 77 |
| 2003 | 92 | 100 |
| 2004 | 109 | 159 |
| 2005 | 103 | 183 |
| 2006 | 186 | 242 |
| 2007 | 167 | 238 |
| 2008 | 183 | 237 |
| 2009 | 206 | 219 |
| 2010 | 223 | 233 |
| 2011 | 246 | 244 |
| 2012 | 261 | 322 |
| 2013 | 319 | 333 |
| 2014 | 350 | 408 |
| 2015 | 404 | 488 |
| 2016 | 497 | 525 |
| 2017 | 583 | 440 |
| 2018 | 478 | 461 |
| 2019 | 508 | 460 |
| 2020 | 477 | 515 |
| 2021 | 387 | 417 |
| 2022 | 337 | 391 |
| 2023 | 285 | 423 |
| 2024 | 306 | 426 |
| 2025 | 339 | 382 |
| 2026 | 248 | 311 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Power amplifier6 Oct 2026US 12,756,362 B2Himax Technologies Limited
- Doherty amplifier system6 Oct 2026US 12,756,363 B2Qorvo US, Inc.
- Amplifier with source degeneration29 Sep 2026US 12,750,008 B2Macronix International Co., Ltd.
- Receiver circuit, corresponding system and method29 Sep 2026US 12,750,009 B2STMicroelectronics International N. V.
- Group III nitride Doherty amplifier using different epitaxial structures29 Sep 2026US 12,750,010 B2MACOM Technology Solutions Holdings, Inc.
- Audio envelope tracking for controlling a tracking power supply8 Oct 2026US 2026/0312540 A1Harman Becker Automotive Systems GmbH
- High-frequency power supply device8 Oct 2026US 2026/0312541 A1Kyosan Electric Mfg. Co., Ltd.
- Multistage amplifier8 Oct 2026US 2026/0312542 A1NTT, Inc.
- Doherty power amplifiers with controllable capacitor for tuning harmonic termination and inverter8 Oct 2026US 2026/0312543 A1Skyworks Solutions, Inc.
- Power amplifier systems with load control8 Oct 2026US 2026/0312548 A1Skyworks Solutions, Inc.
Most cited
By later US patents
- Electronic device having sound output module1,021US 7,046,082 B2Rohm Co., Ltd. · 2006
- Waste energy control and management in power amplifier368US 5,568,088 AEricsson GE Mobile Communications Inc. · 1996
- Active cancellation of transmitter leakage in a wireless transceiver363US 8,175,535 B2Telefonaktiebolaget LM Ericsson (publ) · 2012
- Method and apparatus for operating a radio-frequency power amplifier as a variable-class linear amplifier338US 6,043,707 AMotorola, Inc. · 2000
- Multi-mode amplifier system294US 7,043,213 B2Northrop Grumman Corporation · 2006