H03F 3/20
Power amplifiers
Official title: Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence)
H03F3/20 (Power amplifiers) appears on 12,250 US grants and 13,147 published applications in this corpus.
Search patents in H03F- Granted patents
- 12,250
- Published applications
- 13,147
- Assignees
- 2,149
- Inventors
- 14,280
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 18 | 0 |
| 1977 | 24 | 0 |
| 1978 | 22 | 0 |
| 1979 | 12 | 0 |
| 1980 | 15 | 0 |
| 1981 | 10 | 0 |
| 1982 | 17 | 0 |
| 1983 | 17 | 0 |
| 1984 | 18 | 0 |
| 1985 | 18 | 0 |
| 1986 | 10 | 0 |
| 1987 | 17 | 0 |
| 1988 | 17 | 0 |
| 1989 | 11 | 0 |
| 1990 | 19 | 0 |
| 1991 | 23 | 0 |
| 1992 | 22 | 0 |
| 1993 | 26 | 0 |
| 1994 | 15 | 0 |
| 1995 | 35 | 0 |
| 1996 | 26 | 0 |
| 1997 | 28 | 0 |
| 1998 | 40 | 0 |
| 1999 | 48 | 0 |
| 2000 | 68 | 0 |
| 2001 | 82 | 32 |
| 2002 | 85 | 101 |
| 2003 | 98 | 107 |
| 2004 | 131 | 171 |
| 2005 | 123 | 268 |
| 2006 | 227 | 294 |
| 2007 | 240 | 373 |
| 2008 | 269 | 376 |
| 2009 | 267 | 340 |
| 2010 | 338 | 382 |
| 2011 | 385 | 401 |
| 2012 | 428 | 460 |
| 2013 | 487 | 509 |
| 2014 | 517 | 620 |
| 2015 | 635 | 710 |
| 2016 | 706 | 700 |
| 2017 | 821 | 741 |
| 2018 | 757 | 725 |
| 2019 | 805 | 778 |
| 2020 | 784 | 888 |
| 2021 | 672 | 797 |
| 2022 | 655 | 700 |
| 2023 | 534 | 729 |
| 2024 | 549 | 774 |
| 2025 | 616 | 651 |
| 2026 | 463 | 520 |
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.
- Method and apparatus for controlling second harmonic-of power amplifier in wide frequency range6 Oct 2026US 12,756,365 B2Avago Technologies International Sales Pte. Limited
- Matching network for a power amplifier6 Oct 2026US 12,756,366 B2QUALCOMM Incorporated
- Power amplifier circuit and power amplification method6 Oct 2026US 12,756,367 B2Murata Manufacturing Co., Ltd.
- High-frequency power supply device8 Oct 2026US 2026/0312541 A1Kyosan Electric Mfg. Co., Ltd.
- Doherty power amplifiers with controllable capacitor for tuning harmonic termination and inverter8 Oct 2026US 2026/0312543 A1Skyworks Solutions, Inc.
- Power protection loop for amplifier chain elements8 Oct 2026US 2026/0312544 A1Qorvo US, Inc.
- Load impedance circuit for amplifier8 Oct 2026US 2026/0312545 A1STMicroelectronics International N. V.
- 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
- Distortion compensation apparatus and distortion compensation method358US 9,397,619 B2Fujitsu Limited · 2016
- Method and apparatus for operating a radio-frequency power amplifier as a variable-class linear amplifier338US 6,043,707 AMotorola, Inc. · 2000