H03F 1/3229
Using a loop for error extraction and another loop for error subtraction
Official title: {using a loop for error extraction and another loop for error subtraction}
H03F1/3229 (Using a loop for error extraction and another loop for error subtraction) appears on 421 US grants and 223 published applications in this corpus.
Search patents in H03F- Granted patents
- 421
- Published applications
- 223
- Assignees
- 158
- Inventors
- 509
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 5 | 0 |
| 1985 | 4 | 0 |
| 1986 | 8 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 9 | 0 |
| 1993 | 1 | 0 |
| 1994 | 7 | 0 |
| 1995 | 6 | 0 |
| 1996 | 15 | 0 |
| 1997 | 10 | 0 |
| 1998 | 19 | 0 |
| 1999 | 23 | 0 |
| 2000 | 29 | 0 |
| 2001 | 31 | 8 |
| 2002 | 32 | 33 |
| 2003 | 22 | 39 |
| 2004 | 38 | 39 |
| 2005 | 26 | 21 |
| 2006 | 30 | 12 |
| 2007 | 14 | 6 |
| 2008 | 6 | 8 |
| 2009 | 4 | 7 |
| 2010 | 10 | 5 |
| 2011 | 7 | 1 |
| 2012 | 2 | 4 |
| 2013 | 6 | 8 |
| 2014 | 3 | 2 |
| 2015 | 3 | 1 |
| 2016 | 2 | 0 |
| 2017 | 0 | 2 |
| 2018 | 2 | 2 |
| 2019 | 1 | 1 |
| 2020 | 3 | 4 |
| 2021 | 2 | 3 |
| 2022 | 2 | 7 |
| 2023 | 0 | 1 |
| 2024 | 7 | 4 |
| 2025 | 2 | 2 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Feedforward amplifier circuit, audio amplifier and audio playing device3 Mar 2026US 12,567,839 B2Guangzhou Topping Electronics and Technology Co., Ltd.
- Adaptive biasing procedure to increase auxiliary PA efficiency for an integrated echo canceller23 Dec 2025US 12,506,515 B2Zebra Technologies Corporation
- Differential amplifier including dual magnetically coupled feedback loops15 Apr 2025US 12,278,599 B2QuantalRF AG
- Amplifier linearization using magnetically coupled feedback provided by a transformer coupled to a balun-based load3 Dec 2024US 12,160,203 B2QuantalRF AG
- Amplifier linearization using magnetically coupled feedback19 Nov 2024US 12,149,210 B2QuantalRF AG
- Feed-forward amplifier and method for transitioning between offline and online tuning states2 Jul 2026US 2026/0189195 A1
- Similar combination and cancellation power amplifier circuit30 Apr 2026US 2026/0121589 A1Accula Electronic Technologies Pte Ltd
- Digitally controlled even harmonic distortion correction19 Mar 2026US 2026/0081567 A1Skyworks Solutions, Inc.
- Differential amplifier including dual magnetically coupled feedback loops28 Aug 2025US 2025/0274081 A1QuantalRF AG
- Adaptive Biasing Procedure to Increase Auxiliary PA Efficiency for an Integrated Echo Canceller10 Jul 2025US 2025/0226856 A1Zebra Technologies Corporation
Most cited
By later US patents
- Waste energy control and management in power amplifier368US 5,568,088 AEricsson GE Mobile Communications Inc. · 1996
- Adaptive digital predistortion linearization and feed-forward correction of RF power amplifier136US 5,949,283 ASpectrian Corporation · 1999
- Feed-forward power amplifier system with adaptive control and control method131US 5,485,120 AAval Communications Inc. · 1996
- Waste energy control and management in power amplifiers128US 5,842,140 AEricsson Inc. · 1998
- Feed-forward correction loop with adaptive predistortion injection for linearization of RF power amplifier114US 5,760,646 ASpectrian Corporation · 1998