Class-d amplifier with multiple independent output stages
US-2019149101-A1 · May 16, 2019 · US
Sigma delta modulation being used in an amplifying circuit
Sigma delta modulation being used in an amplifying circuit · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H03F2200/331 |
| Official title | Sigma delta modulation being used in an amplifying circuit |
| Display label | Sigma delta modulation being used in an amplifying circuit |
| Total patents | 158 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 16 |
| 2016 | 17 |
| 2017 | 14 |
| 2018 | 11 |
| 2019 | 22 |
| 2020 | 24 |
| 2021 | 18 |
| 2022 | 17 |
| 2023 | 5 |
| 2024 | 7 |
| 2025 | 6 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Automated envelope tracking system
US-10270394-B2 · Apr 23, 2019 · US
Signal amplification and transmission based on complex delta sigma modulator
US-10158382-B2 · Dec 18, 2018 · US
Controlling noise transfer function of signal path to reduce charge pump noise
US-2018316525-A1 · Nov 1, 2018 · US
Controlling noise transfer function of signal path to reduce charge pump noise
US-2018317007-A1 · Nov 1, 2018 · US
Controlling noise transfer function of signal path to reduce charge pump noise
US-10116473-B1 · Oct 30, 2018 · US
Estimating voltage on speaker terminals driven by a class-D amplifier
US-10110182-B2 · Oct 23, 2018 · US
Digital transmitter
US-2018262219-A1 · Sep 13, 2018 · US
All digital multi-channel RF transmitter for paralel magnetic resonance imaging with SSB modulation
US-10057103-B2 · Aug 21, 2018 · US
Audio amplifier system
US-10008994-B2 · Jun 26, 2018 · US
Digital modulation device, and digital modulation method
US-9991904-B2 · Jun 5, 2018 · US
All digital multi-channel rf transmitter for paralel magnetic resonance imaging with ssb modulation
US-2018109411-A1 · Apr 19, 2018 · US
Transmitter, transmission system, and transmission method
US-9917556-B2 · Mar 13, 2018 · US
Audio signal amplification device
US-9848264-B2 · Dec 19, 2017 · US
Transmitter/receiver apparatus, transmitter apparatus and transmitting/receiving method
US-9838068-B2 · Dec 5, 2017 · US
Digital modulation device, and digital modulation method
US-2017310338-A1 · Oct 26, 2017 · US
Audio amplifier system
US-2017294888-A1 · Oct 12, 2017 · US
Estimating voltage on speaker terminals driven by a class-d amplifier
US-2017272045-A1 · Sep 21, 2017 · US
Audio amplifiers
US-2017250662-A1 · Aug 31, 2017 · US
Transmitter and method for transmission control in a technique of delta sigma modulating
US-9748983-B2 · Aug 29, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H03F2200/331?
- CPC H03F2200/331 is the Cooperative Patent Classification code for “Sigma delta modulation being used in an amplifying circuit.”
- How many patents are filed under CPC H03F2200/331 (Sigma delta modulation being used in an amplifying circuit)?
- Our database includes 158 publications tagged with this CPC code.
- Is patent activity under CPC H03F2200/331 growing?
- Publication counts under this code: 7 in 2024 vs 6 in 2025 (latest complete years).