H03F 3/68
Combinations of amplifiers
Official title: Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics {(power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602)}
H03F3/68 (Combinations of amplifiers) appears on 1,780 US grants and 1,782 published applications in this corpus.
Search patents in H03F- Granted patents
- 1,780
- Published applications
- 1,782
- Assignees
- 600
- Inventors
- 2,872
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 7 | 0 |
| 1978 | 7 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 8 | 0 |
| 1983 | 4 | 0 |
| 1984 | 11 | 0 |
| 1985 | 9 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 5 | 0 |
| 1989 | 6 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 7 | 0 |
| 1996 | 2 | 0 |
| 1997 | 10 | 0 |
| 1998 | 12 | 0 |
| 1999 | 8 | 0 |
| 2000 | 7 | 0 |
| 2001 | 11 | 6 |
| 2002 | 18 | 20 |
| 2003 | 20 | 17 |
| 2004 | 19 | 26 |
| 2005 | 18 | 30 |
| 2006 | 46 | 46 |
| 2007 | 33 | 46 |
| 2008 | 32 | 54 |
| 2009 | 38 | 29 |
| 2010 | 33 | 51 |
| 2011 | 43 | 53 |
| 2012 | 55 | 55 |
| 2013 | 60 | 79 |
| 2014 | 69 | 119 |
| 2015 | 99 | 104 |
| 2016 | 109 | 71 |
| 2017 | 121 | 95 |
| 2018 | 87 | 78 |
| 2019 | 99 | 122 |
| 2020 | 126 | 188 |
| 2021 | 143 | 115 |
| 2022 | 105 | 94 |
| 2023 | 82 | 78 |
| 2024 | 60 | 87 |
| 2025 | 58 | 73 |
| 2026 | 50 | 46 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Methods, systems, and apparatus for coupling power amplifier input signals17 Sep 2026US 2026/0280507 A1Texas Instruments Incorporated
- Semiconductor device and method thereof3 Sep 2026US 2026/0261247 A1Renesas Electronics Corporation
- Power amplification circuit27 Aug 2026US 2026/0254413 A1Murata Manufacturing Co., Ltd.
Most cited
By later US patents
- Hybrid switched mode/linear power amplifier power supply for use in polar transmitter179US 7,058,373 B2Nokia Corporation · 2006
- Audio amplifier power and temperature controller having network detecting and associated methods173US 6,653,899 B2Niles Audio Corporation · 2003
- Stacked transistor method and apparatus171US 7,248,120 B2Peregrine Semiconductor Corporation · 2007
- RF amplifier architecture and related techniques141US 8,824,978 B2Eta Devices, Inc. · 2014
- Power Amplifier incorporating single drain switch and single negative voltage generator139US 6,118,343 ATyco Electronics Logistics AG · 2000