H03F 3/005
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
Official title: {using switched capacitors, e.g. dynamic amplifiers; using switched capacitors as resistors in differential amplifiers (H03F3/45 takes precedence)}
H03F3/005 (Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements) appears on 487 US grants and 430 published applications in this corpus.
Search patents in H03F- Granted patents
- 487
- Published applications
- 430
- Assignees
- 256
- Inventors
- 906
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 5 | 0 |
| 1983 | 4 | 0 |
| 1984 | 5 | 0 |
| 1985 | 4 | 0 |
| 1986 | 8 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 7 | 0 |
| 1999 | 7 | 0 |
| 2000 | 14 | 0 |
| 2001 | 2 | 1 |
| 2002 | 6 | 7 |
| 2003 | 14 | 8 |
| 2004 | 11 | 14 |
| 2005 | 14 | 18 |
| 2006 | 16 | 17 |
| 2007 | 15 | 20 |
| 2008 | 16 | 13 |
| 2009 | 21 | 25 |
| 2010 | 22 | 24 |
| 2011 | 25 | 19 |
| 2012 | 15 | 14 |
| 2013 | 12 | 4 |
| 2014 | 20 | 21 |
| 2015 | 12 | 25 |
| 2016 | 23 | 11 |
| 2017 | 15 | 24 |
| 2018 | 18 | 17 |
| 2019 | 19 | 21 |
| 2020 | 23 | 23 |
| 2021 | 24 | 17 |
| 2022 | 14 | 23 |
| 2023 | 11 | 18 |
| 2024 | 15 | 18 |
| 2025 | 16 | 18 |
| 2026 | 10 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method of precharging a switchable filter8 Sep 2026US 12,732,162 B2Qm Technologies Aps
- Multiplying digital-to-analog converter (MDAC) and capacitor switching amplifier circuit thereof25 Aug 2026US 12,719,490 B2Realtek Semiconductor Corp.
- Semiconductor circuit26 May 2026US 12,640,696 B2Sony Semiconductor Solutions Corporation
- Analog frontend circuit and signal filtering method for photoplethysmography5 May 2026US 12,620,888 B2Realtek Semiconductor Corp.
- Electrical circuit5 May 2026US 12,620,945 B2Gottfried Wilhelm Leibniz Universitat Hannover
- Tracker circuit and radio frequency circuit10 Sep 2026US 2026/0269787 A1Murata Manufacturing Co., Ltd.
- Power converter current sense offset correction circuit13 Aug 2026US 2026/0238197 A1
- Dynamic amplifier that amplifies multiple inputs simultaneously25 Jun 2026US 2026/0180519 A1Realtek Semiconductor Corp.
- Charge amplifier circuit for a capacitive sensing arrangement11 Jun 2026US 2026/0163541 A1EM Microelectronic-Marin SA
- Power-efficient digital power amplifiers26 Mar 2026US 2026/0088772 A1Morse Micro Pty. Ltd.
Most cited
By later US patents
- RF amplifier architecture and related techniques141US 8,824,978 B2Eta Devices, Inc. · 2014
- Switched capacitor amplifier with higher gain and improved closed-loop gain accuracy131US 7,605,650 B2Micron Technology, Inc. · 2009
- Notch filter for ripple reduction in chopper stabilized amplifiers120US 7,292,095 B2Texas Instruments Incorporated · 2007
- Monolithic programmable gain-integrator stage111US 4,438,354 AAmerican Microsystems, Inc. · 1984
- Photo detecting apparatus for detecting reflected light from an object and excluding an external light componet from the reflected light110US 5,705,807 ANissan Motor Co., Ltd. · 1998