Tunable electroacoustic rf filter with improved electric properties and method for operating such a filter
US-2016359469-A1 · Dec 8, 2016 · US
Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence)
Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence) · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H03F3/20 |
| Official title | Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence) |
| Display label | Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence) |
| Total patents | 757 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 45 |
| 2016 | 49 |
| 2017 | 68 |
| 2018 | 66 |
| 2019 | 75 |
| 2020 | 91 |
| 2021 | 101 |
| 2022 | 68 |
| 2023 | 64 |
| 2024 | 70 |
| 2025 | 48 |
| 2026 | 12 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Power amplifier saturation detection
US-9515611-B2 · Dec 6, 2016 · US
Multichannel digital audio interface
US-9461601-B2 · Oct 4, 2016 · US
Adjusting Power Amplifier Stimuli Based on Output Signals
US-2016277045-A1 · Sep 22, 2016 · US
Rectifier circuit for monitoring dc offset of a single-supply audio power amplifier
US-2016269826-A1 · Sep 15, 2016 · US
Card detect architecture for near field communications
US-9438317-B2 · Sep 6, 2016 · US
System and method for digital memorized predistortion for wireless communication
US-9374196-B2 · Jun 21, 2016 · US
Apparatus and methods for calibration of envelope trackers
US-2016099742-A1 · Apr 7, 2016 · US
Apparatus and methods for dual loop power amplifier digital pre-distortion systems
US-9306506-B1 · Apr 5, 2016 · US
Method and apparatus for efficient load biasing
US-9300261-B2 · Mar 29, 2016 · US
Apparatus and methods for power amplifiers
US-2016079940-A1 · Mar 17, 2016 · US
Apparatus and methods for capacitive load reduction
US-9257940-B2 · Feb 9, 2016 · US
Amplifier apparatus
US-9257945-B2 · Feb 9, 2016 · US
Impedance matching circuit, power amplifier and manufacturing method for variable capacitor
US-2016020147-A1 · Jan 21, 2016 · US
Radio frequency splitter
US-9231642-B2 · Jan 5, 2016 · US
Controlled power boost for envelope tracker
US-9225302-B2 · Dec 29, 2015 · US
Envelope tracking modulator with feedback
US-2015365053-A1 · Dec 17, 2015 · US
Power amplifier assembly comprising suspended strip lines
US-9214899-B2 · Dec 15, 2015 · US
Digital predistortion apparatus and method using the sum of absolute input signals for a non-identical number of delays
US-9203355-B2 · Dec 1, 2015 · US
Adjustable power splitters and corresponding methods and apparatus
US-9203348-B2 · Dec 1, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H03F3/20?
- CPC H03F3/20 is the Cooperative Patent Classification code for “Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence).”
- How many patents are filed under CPC H03F3/20 (Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence))?
- Our database includes 757 publications tagged with this CPC code.
- Is patent activity under CPC H03F3/20 growing?
- Publication counts under this code: 70 in 2024 vs 48 in 2025 (latest complete years).