H03F 3/2171
With field-effect devices
Official title: {with field-effect devices (H03F3/2173 - H03F3/2178 take precedence)}
H03F3/2171 (With field-effect devices) appears on 885 US grants and 797 published applications in this corpus.
Search patents in H03F- Granted patents
- 885
- Published applications
- 797
- Assignees
- 367
- Inventors
- 1,335
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 6 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 6 | 0 |
| 1992 | 6 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 9 | 0 |
| 1998 | 9 | 0 |
| 1999 | 12 | 0 |
| 2000 | 9 | 0 |
| 2001 | 22 | 11 |
| 2002 | 24 | 25 |
| 2003 | 23 | 20 |
| 2004 | 25 | 24 |
| 2005 | 16 | 38 |
| 2006 | 22 | 14 |
| 2007 | 22 | 18 |
| 2008 | 15 | 16 |
| 2009 | 11 | 20 |
| 2010 | 19 | 12 |
| 2011 | 10 | 9 |
| 2012 | 18 | 12 |
| 2013 | 20 | 25 |
| 2014 | 22 | 39 |
| 2015 | 36 | 50 |
| 2016 | 53 | 49 |
| 2017 | 70 | 64 |
| 2018 | 57 | 59 |
| 2019 | 62 | 52 |
| 2020 | 65 | 59 |
| 2021 | 37 | 35 |
| 2022 | 40 | 34 |
| 2023 | 28 | 34 |
| 2024 | 30 | 29 |
| 2025 | 23 | 24 |
| 2026 | 16 | 25 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Combined class D amplifier and buck regulator29 Sep 2026US 12,750,019 B2SiliconIntervention Inc.
- Source amplifier and source driver including source amplifier22 Sep 2026US 12,743,986 B2Korea Advanced Institute of Science and Technology
- Class-D amplifier with nested feedback loops22 Sep 2026US 12,744,497 B2Qsc, LLC
- System and method for reduction in power supply rail pumping in class D audio amplifiers using dual regulated DC-DC converters16 Jun 2026US 12,658,865 B2Harman Professional, Inc.
- Semiconductor device and electronic apparatus16 Jun 2026US 12,659,680 B2Seiko Epson Corporation
- Method and devices to increase power added efficiency in power amplifiers20 Aug 2026US 2026/0246427 A1pSemi Corporation
- Class-d amplifier with nested feedback loops13 Aug 2026US 2026/0238169 A1Qsc, LLC
- Phase Shifting Element For A Pulse Width Modulator (PWM) Generator6 Aug 2026US 2026/0230039 A1Massachusetts Institute of Technology
- Auto Zero Circuit for a Current Sense Amplifier16 Jul 2026US 2026/0205065 A1
- Audio amplifier with clipping control9 Jul 2026US 2026/0196975 A1Monolithic Power Systems, Inc.
Most cited
By later US patents
- High power battery powered RF amplifier topology200US 10,159,524 B2Ethicon, Inc. · 2018
- Stacked transistor method and apparatus171US 7,248,120 B2Peregrine Semiconductor Corporation · 2007
- Monolithic class D amplifier170US 5,973,368 A1999
- Class D hearing aid amplifier161US 4,689,819 AIndustrial Research Products, Inc. · 1987
- Apparatus and method for efficiently amplifying wideband envelope signals157US 6,300,826 B12001