H03F 1/52
Circuit arrangements for protecting such amplifiers
Official title: Circuit arrangements for protecting such amplifiers {(monitoring arrangements G01R31/28; increasing reliability in communication systems, e.g. using redundancy H04B1/74)}
H03F1/52 (Circuit arrangements for protecting such amplifiers) appears on 1,534 US grants and 1,296 published applications in this corpus.
Search patents in H03F- Granted patents
- 1,534
- Published applications
- 1,296
- Assignees
- 576
- Inventors
- 2,747
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 26 | 0 |
| 1977 | 22 | 0 |
| 1978 | 15 | 0 |
| 1979 | 14 | 0 |
| 1980 | 14 | 0 |
| 1981 | 12 | 0 |
| 1982 | 19 | 0 |
| 1983 | 14 | 0 |
| 1984 | 12 | 0 |
| 1985 | 14 | 0 |
| 1986 | 5 | 0 |
| 1987 | 13 | 0 |
| 1988 | 16 | 0 |
| 1989 | 8 | 0 |
| 1990 | 7 | 0 |
| 1991 | 10 | 0 |
| 1992 | 13 | 0 |
| 1993 | 11 | 0 |
| 1994 | 9 | 0 |
| 1995 | 15 | 0 |
| 1996 | 21 | 0 |
| 1997 | 10 | 0 |
| 1998 | 17 | 0 |
| 1999 | 31 | 0 |
| 2000 | 20 | 0 |
| 2001 | 16 | 7 |
| 2002 | 19 | 21 |
| 2003 | 30 | 30 |
| 2004 | 25 | 38 |
| 2005 | 28 | 48 |
| 2006 | 39 | 47 |
| 2007 | 38 | 55 |
| 2008 | 48 | 61 |
| 2009 | 43 | 47 |
| 2010 | 59 | 43 |
| 2011 | 43 | 42 |
| 2012 | 48 | 47 |
| 2013 | 40 | 36 |
| 2014 | 51 | 50 |
| 2015 | 47 | 44 |
| 2016 | 58 | 68 |
| 2017 | 60 | 45 |
| 2018 | 55 | 62 |
| 2019 | 72 | 58 |
| 2020 | 58 | 67 |
| 2021 | 56 | 71 |
| 2022 | 53 | 59 |
| 2023 | 48 | 70 |
| 2024 | 45 | 69 |
| 2025 | 43 | 72 |
| 2026 | 44 | 39 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- RF circuit for preventing damage to power amplifier29 Sep 2026US 12,750,014 B2Samsung Electronics Co., Ltd.
- Transconductor with current limiter15 Sep 2026US 12,738,899 B2Nokia Solutions and Networks Oy
- Protection circuit for acoustic filter and power amplifier stage15 Sep 2026US 12,738,900 B2Qorvo US, Inc.
- RF amplifier circuit with a feedback circuit and method for adjusting a gain mode of same circuit8 Sep 2026US 12,732,137 B2Infineon Technologies AG
- Voltage and current sense circuits for measuring a load connected to a power amplifier25 Aug 2026US 12,716,920 B2Goodix Technology (Hk) Company Limited
- Power protection loop for amplifier chain elements8 Oct 2026US 2026/0312544 A1Qorvo US, Inc.
- System and method for adaptive power amplifier protection1 Oct 2026US 2026/0303037 A1QUALCOMM Incorporated
- Force controlled loudspeaker protection system3 Sep 2026US 2026/0261797 A1Dolby Laboratories Licensing Corporation
- Bidirectional conduction chip, circuit system, and electronic device27 Aug 2026US 2026/0254269 A1Shanghai Yaohuo Microelectronics Co., Ltd.
- Electrical biasing circuit with current limiter6 Aug 2026US 2026/0230044 A1GLOBALFOUNDRIES U. S. Inc.
Most cited
By later US patents
- Electrosurgical generator with high-frequency pulse width modulated feedback power control434US 4,727,874 AC. R. Bard, Inc. · 1988
- Audio amplifier power and temperature controller having network detecting and associated methods173US 6,653,899 B2Niles Audio Corporation · 2003
- Monolithic class D amplifier170US 5,973,368 A1999
- Load impedance detector for audio power amplifiers161US 4,549,147 AVictor Company of Japan, Ltd. · 1985
- CMOS output buffer with slew rate control125US 5,877,647 ATexas Instruments Incorporated · 1999