H03F 3/2175
Using analogue-digital or digital-analogue conversion
Official title: {using analogue-digital or digital-analogue conversion (H03F3/2173 takes precedence)}
H03F3/2175 (Using analogue-digital or digital-analogue conversion) appears on 389 US grants and 362 published applications in this corpus.
Search patents in H03F- Granted patents
- 389
- Published applications
- 362
- Assignees
- 182
- Inventors
- 629
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 7 | 1 |
| 2002 | 4 | 5 |
| 2003 | 4 | 4 |
| 2004 | 10 | 15 |
| 2005 | 8 | 9 |
| 2006 | 10 | 9 |
| 2007 | 12 | 10 |
| 2008 | 7 | 12 |
| 2009 | 6 | 4 |
| 2010 | 7 | 5 |
| 2011 | 7 | 8 |
| 2012 | 6 | 4 |
| 2013 | 9 | 8 |
| 2014 | 8 | 17 |
| 2015 | 19 | 25 |
| 2016 | 25 | 20 |
| 2017 | 27 | 24 |
| 2018 | 25 | 26 |
| 2019 | 31 | 29 |
| 2020 | 37 | 26 |
| 2021 | 26 | 18 |
| 2022 | 17 | 21 |
| 2023 | 12 | 25 |
| 2024 | 11 | 12 |
| 2025 | 20 | 12 |
| 2026 | 9 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hybrid class-D amplifier4 Aug 2026US 12,700,835 B2Realtek Semiconductor Corp.
- Reference startup circuit for audio amplifiers16 Jun 2026US 12,656,806 B2Skyworks Solutions, Inc.
- Pulse-width modulation audio amplifier having feed forward loop26 May 2026US 12,640,693 B2Skyworks Solutions, Inc.
- Switching drivers with voltage monitoring19 May 2026US 12,633,885 B2Cirrus Logic, Inc.
- Methods of nonlinearity estimation, reporting, and compensation12 May 2026US 12,627,538 B2Telefonaktiebolaget LM Ericsson (publ)
- Compensated regulation for pulse-width modulation amplifiers27 Aug 2026US 2026/0254424 A1Skyworks Solutions, Inc.
- Class-d amplifier with nested feedback loops13 Aug 2026US 2026/0238169 A1Qsc, LLC
- Adaptive digital lc compensation filter for audio amplifiers23 Jul 2026US 2026/0213716 A1Axign B.V.
- Trimming an offset voltage drift based on measurements at two temperatures28 May 2026US 2026/0149425 A1Microchip Technology Incorporated
- Output stage of a digital to analog converter21 May 2026US 2026/0142669 A1Texas Instruments Incorporated
Most cited
By later US patents
- Amplitude modulation using digitally selected carrier amplifiers178US 4,580,111 AHarris Corporation · 1986
- Method and apparatus for implementing a class D driver and speaker system137US 7,058,463 B1Nokia Corporation · 2006
- Linearization circuits and methods for multilevel power amplifier systems133US 8,829,993 B2Eta Devices, Inc. · 2014
- Digital signal processor enhanced pulse width modulation amplifier113US 6,683,494 B2Harman International Industries, Incorporated · 2004
- Real time correction of a digital PWM amplifier94US 6,373,334 B1Cirrus Logic, Inc. · 2002