H03H 11/126
Using a single operational amplifier
Official title: {using a single operational amplifier (H03H11/1204 takes precedence; parallel-T filters H03H11/1295)}
H03H11/126 (Using a single operational amplifier) appears on 263 US grants and 194 published applications in this corpus.
Search patents in H03H- Granted patents
- 263
- Published applications
- 194
- Assignees
- 152
- Inventors
- 441
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 2 |
| 2002 | 4 | 4 |
| 2003 | 5 | 3 |
| 2004 | 5 | 10 |
| 2005 | 9 | 12 |
| 2006 | 14 | 9 |
| 2007 | 6 | 8 |
| 2008 | 12 | 8 |
| 2009 | 5 | 3 |
| 2010 | 8 | 21 |
| 2011 | 6 | 3 |
| 2012 | 5 | 4 |
| 2013 | 11 | 9 |
| 2014 | 14 | 12 |
| 2015 | 13 | 8 |
| 2016 | 6 | 3 |
| 2017 | 4 | 10 |
| 2018 | 11 | 8 |
| 2019 | 9 | 9 |
| 2020 | 11 | 8 |
| 2021 | 10 | 9 |
| 2022 | 8 | 9 |
| 2023 | 2 | 11 |
| 2024 | 12 | 5 |
| 2025 | 9 | 3 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H03H 11/1286Sallen-key biquad49
- H03H 11/1269Filters using the operational amplifier pole8
- H03H 11/1278Modifications to reduce detrimental influences of amplifier imperfections8
- H03H 11/1265Synthesis4
- H03H 11/1282Modifications to reduce influence of variations of temperature3
- H03H 11/1273Modifications to reduce sensitivity1
Recent patents
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- Low-pass filter circuit14 Oct 2025US 12,445,115 B2NXP B. V.
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- Circuit of drift detection in electric signal filters, corresponding device and method30 Apr 2026US 2026/0121619 A1STMicroelectronics International N. V.
- Feedforward Notch Filter Circuitry8 Jan 2026US 2026/0012158 A1Apple Inc.
- Reconfigurable multi-feedback filter for mmw receivers18 Dec 2025US 2025/0385697 A1QUALCOMM Incorporated
- Detection device3 Apr 2025US 2025/0110251 A1Japan Display Inc.
Most cited
By later US patents
- Apparatus and method for filtering electrocardiograph signals113US 4,887,609 AThe Methodist Hospital System · 1989
- Isolation amplifier with precise timing of signals coupled across isolation barrier109US 4,835,486 ABurr-Brown Corporation · 1989
- Filter circuit having a biquadratic transfer function105US 4,253,069 ASiemens Aktiengesellschaft · 1981
- Isolation amplifier with precise timing of signals coupled across isolation barrier79US 4,748,419 ABurr-Brown Corporation · 1988
- Adaptive radio transceiver with floating MOSFET capacitors79US 6,920,311 B2Broadcom Corporation · 2005