H03F 2203/21157
A filter circuit being added at the output of a power amplifier
Official title: A filter circuit being added at the output of a power amplifier stage
H03F2203/21157 (A filter circuit being added at the output of a power amplifier) appears on 155 US grants and 164 published applications in this corpus.
Search patents in H03F- Granted patents
- 155
- Published applications
- 164
- Assignees
- 72
- Inventors
- 251
- Latest grant
- 4 Aug 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 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 2 | 2 |
| 2005 | 1 | 0 |
| 2006 | 0 | 2 |
| 2007 | 1 | 1 |
| 2008 | 0 | 5 |
| 2009 | 2 | 3 |
| 2010 | 4 | 7 |
| 2011 | 7 | 8 |
| 2012 | 7 | 23 |
| 2013 | 10 | 11 |
| 2014 | 12 | 4 |
| 2015 | 17 | 12 |
| 2016 | 9 | 11 |
| 2017 | 9 | 4 |
| 2018 | 9 | 7 |
| 2019 | 9 | 28 |
| 2020 | 15 | 7 |
| 2021 | 14 | 5 |
| 2022 | 7 | 4 |
| 2023 | 6 | 9 |
| 2024 | 4 | 3 |
| 2025 | 5 | 2 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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Most cited
By later US patents
- Charge pump based power amplifier envelope power supply and bias power supply126US 8,542,061 B2RF Micro Devices, Inc. · 2013
- Systems and methods for power amplifiers with voltage boosting multi-primary transformers102US 7,880,547 B2Georgia Tech Research Corporation · 2011
- Cascaded converged power amplifier89US 8,942,651 B2RF Micro Devices, Inc. · 2015
- Chireix architecture using low impedance amplifiers78US 6,836,183 B2IceFyre Semiconductor Corporation · 2004
- Switched-mode power amplifier integrally performing power combining78US 6,937,096 B2IceFyre Semiconductor Corporation · 2005