Voltage generation circuit and audio output circuit
US-2025192741-A1 · Jun 12, 2025 · US
DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence)
DC amplifiers in which all stages are DC-coupled (H03F3/45 takes 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 | H03F3/34 |
| Official title | DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence) |
| Display label | DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence) |
| Total patents | 38 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 2 |
| 2017 | 2 |
| 2018 | 4 |
| 2019 | 6 |
| 2020 | 4 |
| 2021 | 3 |
| 2022 | 7 |
| 2023 | 5 |
| 2024 | 2 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Current-Voltage Conversion Device
US-2025147530-A1 · May 8, 2025 · US
Semiconductor device and memory device comprising the same
US-12066849-B2 · Aug 20, 2024 · US
Optical reception device, station-side device, PON system, preamplifier, optical reception method, and method for suppressing output inversion of integrator
US-11942998-B2 · Mar 26, 2024 · US
Solid-state imaging element, imaging device, and method for controlling solid-state imaging element
US-11800257-B2 · Oct 24, 2023 · US
High-efficiency transmitter
US-11706075-B2 · Jul 18, 2023 · US
Solid-state image sensor and imaging device
US-11653119-B2 · May 16, 2023 · US
Aerosol-generating device
US-2023079366-A1 · Mar 16, 2023 · US
Semiconductor device and memory device comprising the same
US-2023057178-A1 · Feb 23, 2023 · US
Bidirectional switch for power control in a daisy chain
US-11522538-B2 · Dec 6, 2022 · US
High-efficiency transmitter
US-2022294683-A1 · Sep 15, 2022 · US
Optical reception device, station-side device, pon system, preamplifier, optical reception method, and method for suppressing output inversion of integrator
US-2022190932-A1 · Jun 16, 2022 · US
Solid-state image sensor and imaging device
US-2022174231-A1 · Jun 2, 2022 · US
Amplification circuit, radio-frequency front end circuit, and communication device
US-11323080-B2 · May 3, 2022 · US
Microphone assembly with digital feedback loop
US-11323805-B2 · May 3, 2022 · US
Bidirectional switch for power control in a daisy chain
US-2022094355-A1 · Mar 24, 2022 · US
Solid-state imaging element, imaging device, and method for controlling solid-state imaging element
US-2021297622-A1 · Sep 23, 2021 · US
Current mirror arrangements with reduced input impedance
US-11106233-B1 · Aug 31, 2021 · US
Microphone assembly with digital feedback loop
US-2021112337-A1 · Apr 15, 2021 · US
Microphone assembly with digital feedback loop
US-10880646-B2 · Dec 29, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H03F3/34?
- CPC H03F3/34 is the Cooperative Patent Classification code for “DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence).”
- How many patents are filed under CPC H03F3/34 (DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence))?
- Our database includes 38 publications tagged with this CPC code.
- Is patent activity under CPC H03F3/34 growing?
- Publication counts under this code: 2 in 2024 vs 2 in 2025 (latest complete years).