H03H 11/12
Using amplifiers with feedback
Official title: using amplifiers with feedback ({H03H11/0422} , H03H11/08, H03H11/10 take precedence)
H03H11/12 (Using amplifiers with feedback) appears on 1,128 US grants and 769 published applications in this corpus.
Search patents in H03H- Granted patents
- 1,128
- Published applications
- 769
- Assignees
- 488
- Inventors
- 1,684
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 19 | 0 |
| 1977 | 18 | 0 |
| 1978 | 8 | 0 |
| 1979 | 6 | 0 |
| 1980 | 8 | 0 |
| 1981 | 19 | 0 |
| 1982 | 11 | 0 |
| 1983 | 14 | 0 |
| 1984 | 8 | 0 |
| 1985 | 14 | 0 |
| 1986 | 11 | 0 |
| 1987 | 8 | 0 |
| 1988 | 12 | 0 |
| 1989 | 20 | 0 |
| 1990 | 8 | 0 |
| 1991 | 11 | 0 |
| 1992 | 13 | 0 |
| 1993 | 12 | 0 |
| 1994 | 9 | 0 |
| 1995 | 15 | 0 |
| 1996 | 12 | 0 |
| 1997 | 12 | 0 |
| 1998 | 14 | 0 |
| 1999 | 20 | 0 |
| 2000 | 15 | 0 |
| 2001 | 15 | 12 |
| 2002 | 28 | 17 |
| 2003 | 30 | 28 |
| 2004 | 28 | 44 |
| 2005 | 36 | 55 |
| 2006 | 56 | 45 |
| 2007 | 30 | 39 |
| 2008 | 44 | 51 |
| 2009 | 40 | 43 |
| 2010 | 44 | 51 |
| 2011 | 45 | 31 |
| 2012 | 25 | 29 |
| 2013 | 53 | 35 |
| 2014 | 46 | 39 |
| 2015 | 40 | 29 |
| 2016 | 33 | 21 |
| 2017 | 34 | 25 |
| 2018 | 20 | 20 |
| 2019 | 23 | 30 |
| 2020 | 28 | 21 |
| 2021 | 32 | 23 |
| 2022 | 17 | 23 |
| 2023 | 13 | 19 |
| 2024 | 20 | 17 |
| 2025 | 24 | 11 |
| 2026 | 7 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H03H 11/1291Current or voltage controlled filters534
- H03H 11/1217Using a plurality of operational amplifiers277
- H03H 11/126Using a single operational amplifier263
- H03H 11/1213Using transistor amplifiers195
- H03H 11/1204Distributed rc filters30
- H03H 11/1295Parallel-t filters12
- H03H 11/1208Comprising an electromechanical resonator11
Recent patents
- Input/output capacitance reduction with negative impedance23 Jun 2026US 12,663,886 B2Intel Corporation
- Active RC-type filter and method of implementing an active RC-type filter26 May 2026US 12,640,710 B2NXP B. V.
- Oscillator with a multiple pole resonator14 Apr 2026US 12,603,610 B2Anlotek Limited
- Phase noise reduction in a variable analogue RF resonator with switched capacitors17 Mar 2026US 12,580,544 B2Anlotek Limited
- System and method for coupled resonator filtering3 Mar 2026US 12,567,855 B2QuantalRF AG
- Passive switched-capacitor filter with tunable complex poles8 Oct 2026US 2026/0312567 A1Apple Inc.
- Tunable transconductance-capacitance filter24 Sep 2026US 2026/0291468 A1QUALCOMM Incorporated
- Notch filter circuit with all-pass filter for independent control of filter gain and quality factor6 Aug 2026US 2026/0230062 A1QUALCOMM Incorporated
- Low-pass active filter for a motor-driving pwm signal16 Jul 2026US 2026/0205095 A1Etel S.A.
- Noise filter25 Jun 2026US 2026/0180428 A1Mitsubishi Electric Corporation
Most cited
By later US patents
- Tunable filter and method of tuning a filter328US 6,778,023 B2Nokia Corporation · 2004
- Adaptive radio transceiver with low noise amplification211US 6,417,737 B1Broadcom Corporation · 2002
- Tunable filter with bypass134US 6,618,579 B1The Chase Manhattan Bank · 2003
- Method and apparatus for tuning a continuous time filter127US 5,914,633 ALucent Technologies Inc. · 1999
- Tissue signature tracking tranceiver126US 4,584,880 ADymax Corporation · 1986