FDD-radiofrequentieversterker: Custom Design Considerations and Wideband Frequency Challenges
Buyer’s Inquiry
Hallo, I want to know about the amplifiers. I saw your FDD radio frequency amplifier, but the frequencies that are there are not suitable for us. and I want to know if you can make us an amplifier for our frequencies. And how long will it be in time? Tx 300-2500MHz Rx 300-860MHz, that is two amplifiers. in general, we have an FDD transceiver and we need amplifiers for it. I know that conventional amplifiers can greatly distort our radio communication. So I want to know if you have something suitable for us on the frequencies: tx 300-2500 MHz and rx 300-860 MHz. Preferably it would be 150-200 MHz of operating frequency.
Invoering
Een FDD radio frequency amplifier is a critical component in modern wireless communication systems where simultaneous transmission (TX) and reception (RX) are required on different frequency bands. Frequency Division Duplexing (FDD) is widely used in professional applications such as UAV data links, COFDM video transmission, public safety communications, broadband wireless systems, and military or industrial radio links.
While many FDD RF amplifiers are available as standard products with fixed frequency bands, real-world projects often require custom frequency ranges, higher performance, or special integration requirements. This article explains the key technical considerations involved in designing and customizing an FDD radio frequency amplifier, especially for wide and non-standard frequency ranges.
What Is an FDD Radio Frequency Amplifier?
An FDD radio frequency amplifier is designed to operate in a system where:
- TX (Verzenden) en RX (Receive) signals work simultaneously
- TX and RX use different frequency bands
- High isolation between TX and RX paths is required
A complete FDD RF amplification chain may include:
- TX power amplifier (PA)
- RX low-noise amplifier (LNA)
- Duplexer or band-pass / band-stop filters
- Protection circuits (VSWR, over-temperature, over-current)
The goal is to increase transmission power while maintaining excellent linearity and to amplify weak received signals without degrading the noise figure.
Custom Frequency Requirements in FDD Systems
TX Frequency Range Challenges (300–2500 MHz Example)
One of the most common customer requests is support for a very wide TX frequency range, such as 300–2500 MHz. From an RF engineering perspective, this presents several challenges:
- Extremely wide bandwidth (over 2 octaves)
- Difficulty maintaining flat gain across the entire band
- Reduced power efficiency at band edges
- Linearity degradation (EVM, ACLR) for wideband modulation schemes
Because of these limitations, a single high-performance PA covering 300–2500 MHz is usually not the optimal solution.
Practical Engineering Solutions
In professional FDD radio frequency amplifier designs, wide TX ranges are typically handled by:
- Splitting the TX band into multiple sub-bands, zoals:
- 300–800 MHz
- 800–1500 MHz
- 1500–2500 MHz
- Or customizing the amplifier for the actual operating frequencies used in the system
This approach significantly improves stability, efficiëntie, linearity, and long-term reliability.
RX Frequency Design (300–860 MHz Example)
Compared with TX power amplification, RX amplification is technically more straightforward.
A typical RX path includes:
- Low-noise amplifier (LNA)
- High linearity design to avoid desensitization
- Optional gain control (AGC)
- Input filtering to suppress TX leakage
For RX frequency ranges such as 300–860 MHz, custom designs are mature and widely achievable, even in compact module formats.
TX/RX Isolation and Duplexing in FDD Amplifiers
One of the most critical aspects of an FDD radio frequency amplifier is TX/RX isolation.
Key design considerations include:
- Required isolation level between TX and RX
- Shared antenna vs. separate antennas
- Duplexer or external filter implementation
- Suppression of TX harmonics and spurious emissions
When TX power levels are high and frequency separation is limited, proper duplexer and filter design becomes essential to protect the RX LNA from saturation or damage.
In many systems, the best architecture is:
- Power amplifier + LNA as modules
- External duplexer or cavity filter customized to the frequency plan
Typical Custom Development Timeline
The development cycle for a custom FDD radio frequency amplifier generally follows these steps:
- Technical specification confirmation (frequentie, macht, modulatie)
- RF design and component selection
- Prototype fabrication
- Laboratory testing and optimization
- Environmental and reliability validation
A realistic sample lead time for a custom FDD RF amplifier is typically 4–8 weeks, depending on frequency range, output power, and performance requirements.
Key Parameters Required for Customization
To design an optimized FDD radio frequency amplifier, the following parameters are essential:
- TX output power (bijv. 1w, 2w, 5w, 10w)
- Modulatietype (COFDM, DVB-T/T2, QPSK, QAM, enz.)
- Linearity requirements (EVM, ACLR)
- Duty cycle (continuous or burst transmission)
- Antenna configuration
- Mechanical form factor (module, board-level, enclosed)
- Target application (UAV, ground station, mobile or fixed link)
Clear definition of these parameters allows engineers to balance performance, cost, grootte, and reliability.
Why Choose a Custom FDD Radio Frequency Amplifier Solution?
Choosing the right FDD radio frequency amplifier is not only about frequency coverage, but also about system reliability, link stability, and long-term scalability.
For applications requiring non-standard or wide frequency ranges, off-the-shelf amplifiers are often a compromise. EEN custom-designed FDD RF amplifier allows you to:
- Match the exact TX and RX frequency plan of your system
- Achieve higher output power efficiency and better linearity
- Improve TX/RX isolation and receiver protection
- Optimize size, gewicht, and power consumption (Ruil)
- Ensure compatibility with COFDM, DVB-T/T2, and other wideband modulations
By segmenting wide TX ranges such as 300–2500 MHz into practical sub-bands, engineers can deliver stable, production-ready solutions instead of experimental wideband designs.
Our Custom FDD RF Amplifier Capabilities
We specialize in the design and manufacturing of custom FDD radio frequency amplifiers for professional and industrial wireless applications, including:
- UAV and drone data links
- COFDM video transmission systems
- Ground control stations
- Public safety and tactical communications
- Fixed and mobile wireless links
Our engineering team supports:
- Custom TX power levels (from low power to multi-watt output)
- Flexible frequency band customization
- Integrated PA + LNA architectures
- External or integrated duplexer solutions
- Rapid prototyping and small-batch production
Typisch sample lead time is 4–8 weeks, depending on frequency complexity and performance requirements.
Conclusie
Een FDD radio frequency amplifier should be designed around your real operating conditions—not forced to fit into a generic frequency band.
For wide or non-standard frequency requirements, A custom-engineered FDD RF amplifier provides higher performance, better reliability, and a clearer upgrade path for future system expansion.
If you are planning an FDD wireless system and need a custom frequency amplifier solution, early technical communication is the key to success. Our team is ready to evaluate your requirements and propose an optimized RF solution tailored to your application.
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