H03F 2203/20
Indexing scheme relating to power amplifiers
Official title: Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
H03F2203/20 (Indexing scheme relating to power amplifiers) appears on 1,185 US grants and 1,269 published applications in this corpus.
Search patents in H03F- Granted patents
- 1,185
- Published applications
- 1,269
- Assignees
- 354
- Inventors
- 1,813
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 2 |
| 2002 | 3 | 9 |
| 2003 | 11 | 7 |
| 2004 | 11 | 15 |
| 2005 | 11 | 8 |
| 2006 | 7 | 8 |
| 2007 | 11 | 31 |
| 2008 | 17 | 28 |
| 2009 | 16 | 24 |
| 2010 | 29 | 47 |
| 2011 | 48 | 56 |
| 2012 | 47 | 59 |
| 2013 | 55 | 52 |
| 2014 | 60 | 90 |
| 2015 | 88 | 140 |
| 2016 | 138 | 169 |
| 2017 | 170 | 112 |
| 2018 | 101 | 71 |
| 2019 | 81 | 85 |
| 2020 | 70 | 82 |
| 2021 | 72 | 44 |
| 2022 | 39 | 26 |
| 2023 | 20 | 28 |
| 2024 | 25 | 34 |
| 2025 | 23 | 24 |
| 2026 | 15 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fully integrated CMOS multiple MOSFET-stacked double push-pull RF power amplifier29 Sep 2026US 12,750,012 B2Shanghai WUQI Microelectronics Co., Ltd.
- Progressive envelope tracking with delay compensation15 Sep 2026US 12,738,894 B2Qorvo US, Inc.
- Voltage and current sense circuits for measuring a load connected to a power amplifier25 Aug 2026US 12,716,920 B2Goodix Technology (Hk) Company Limited
- Scalable periphery tunable matching power amplifier25 Aug 2026US 12,719,415 B2pSemi Corporation
- Power amplifier and filtering circuitry25 Aug 2026US 12,719,422 B2Apple Inc.
- Dual-drive high-efficiency wide-band compact doherty power amplifier17 Sep 2026US 2026/0280490 A1EMTAR Technologies Inc.
- Switching amplifiers27 Aug 2026US 2026/0254416 A1Cirrus Logic International Semiconductor Ltd.
- Switching amplifiers27 Aug 2026US 2026/0254417 A1Cirrus Logic International Semiconductor Ltd.
- Amplification circuit27 Aug 2026US 2026/0254418 A1RichWave Technology Corp.
- Switching amplifiers27 Aug 2026US 2026/0254423 A1Cirrus Logic International Semiconductor Ltd.
Most cited
By later US patents
- High-frequency amplifier, transmitting device and receiving device216US 5,903,854 ASony Corporation · 1999
- Apparatus and methods for envelope tracking202US 8,718,188 B2Skyworks Solutions, Inc. · 2014
- High efficiency power amplifier circuit with wide dynamic backoff range169US 6,157,253 AMotorola, Inc. · 2000
- High sensitivity, high resolution detection of signals163US 7,085,502 B2Amplification Technologies, Corp. · 2006
- High power high impedance microwave devices for power applications154US 6,137,367 AAMCOM Communications, Inc. · 2000