Overview
The KBA-40 is a radio frequency multiplier from Mini-Circuits, primarily used in local oscillators, frequency synthesizers, and other circuits requiring radio frequency extension. This device employs a passive radio frequency multiplier structure, which can increase the frequency of the input signal to its second harmonic component, thereby reducing the system’s dependence on a separate high-frequency signal source.
According to the manufacturer’s product data, the KBA-40 has an output frequency range of 5.4–9.6 GHz and is suitable for signal generation and frequency conversion systems in the microwave band. The device features a 50Ω RF interface and provides an independent sampling output port, facilitating signal monitoring or connection to subsequent circuits in some systems.
Core technical parameters
| Parameter Items | Technical Specifications |
| Manufacturer | Mini-Circuits |
| Product Model | KBA-40 |
| Device type | RF frequency multiplier |
| Frequency multiplication method | Double frequency |
| Output frequency range | 5.4–9.6 GHz |
| Corresponding to the second harmonic input frequency | 2.7–4.8 GHz |
| System impedance | 50Ω |
| Typical insertion loss | 12.3 dB |
| Maximum RF input power | 200 mW |
| Typical output power of sampling port | Approximately -10 dBc relative to the main output |
| Operating temperature range | -40°C～+85°C |
| Storage temperature range | -55°C to +100°C |
| Packaging | SM2 surface mount package |
| Maximum package height | Approximately 0.070 inches, or 1.78 mm |
| Typical applications | Frequency synthesizer, local oscillator |
Product Features and Technical Analysis
1. Frequency doubling function and microwave frequency extension
The core function of the KBA-40 is to generate the second harmonic component of the input signal. For example, when the input signal is 3.5 GHz, the theoretical second harmonic output is 7.0 GHz; however, the actual output power, harmonic distribution, and spectral quality depend on the device characteristics and operating conditions.
2. Output frequency band of 5.4–9.6 GHz
The official data for the KBA-40 lists an output frequency range of 5.4–9.6 GHz, with a corresponding double-frequency input range of 2.7–4.8 GHz.
3. 50Ω RF interface and impedance matching
The KBA-40 is designed with a 50Ω RF system impedance. 50Ω is a commonly used system impedance standard for RF test equipment, coaxial connectors, and many microwave circuits.
4. Conversion Loss and Input Power Design
The manufacturer specifies a typical insertion loss of 12.3 dB. For frequency multipliers, a portion of the input signal power is transferred to the target harmonic component, while the remaining power may be distributed in other harmonics or loss paths. Therefore, sufficient signal power margin needs to be reserved for subsequent circuits during the design phase.
5. Sampling Port and RF Monitoring
The KBA-40 provides a separate SAMPLE port, with a typical output power approximately 10 dB lower than the main output. This port can be used for signal monitoring or auxiliary detection in some systems.
Typical application scenarios
1. Local Oscillator (LO) Circuit
In superheterodyne receivers, microwave receiver modules, and frequency conversion systems, the local oscillator provides a reference signal for the mixer. The KBA-40 can be used to convert lower-frequency input signals into higher-frequency local oscillator signals.
2. Frequency synthesizer
Frequency synthesizers can generate the desired frequency through modules such as oscillator, frequency divider, frequency multiplier, and filter. The KBA-40 can be used as a frequency multiplier stage to convert signals within an appropriate frequency range into an output of 5.4–9.6 GHz.
3. Microwave test and measurement equipment
Some RF test equipment requires the generation or processing of signals in the microwave band. The KBA-40 can be used as a functional module in the frequency generation chain, in conjunction with signal sources, amplifiers, filters, and measuring instruments.
4. Radio Frequency R&D and Prototype Verification
During microwave circuit development, engineers may need to test the frequency multiplier output corresponding to different input frequencies. The KBA-40 can be used to build frequency multiplier prototypes to help evaluate the relationship between the input signal, frequency conversion, and subsequent filtering.
Comparison with other RF frequency generation schemes
| Comparison Dimensions | KBA-40 RF frequency doubler | Direct high frequency signal source | Programmable frequency synthesizer |
| Main functions | Increase the input frequency to twice the normal frequency. | Directly generate target frequency | Generate configurable frequencies based on architecture |
| Input signal requirements | It needs to be compatible with the device’s operating frequency band. | Depending on the equipment | Depending on the synthesis architecture |
| Output frequency flexibility | Limited by specified input and output frequency bands | Depends on signal source specifications | Depends on chip and peripheral design |
| Output power | Affected by conversion loss and input power | Depending on equipment specifications | Depends on the synthesizer and output stage |
| Phase noise | Affected by input source and frequency doubling process | Depends on signal source performance | Depends on the reference source and the synthetic architecture |
| Harmonic Management | Typically, filtering and spurious signals need to be considered. | Depends on the equipment design | Depending on the synthesis method and filter structure |
| Typical uses | Local oscillator and microwave frequency extension | Test signal generation | Configurable frequency generation |
The suitability of the KBA-40 depends on whether the system already has a suitable input signal and whether the double-frequency architecture meets the target frequency and spectral specifications. If the design requires a wide range of frequency adjustment, higher output power, or specific phase noise performance, a comparison of direct signal source and frequency synthesizer solutions should be made.
Manufacturer Profile
Mini-Circuits is a supplier of radio frequency and microwave components, including amplifiers, mixers, filters, attenuators, power dividers, and frequency multipliers, used in communications, test and measurement, instrumentation, and other radio frequency systems.
Why choose KBA-40?
When choosing KBA-40, the following factors should be considered:
- Target frequency matching: Its 5.4–9.6 GHz output range is suitable for corresponding microwave frequency extension requirements.
- Clear RF interface requirements: 50Ω system impedance for easy integration into common RF test and interconnect architectures.
- Independent sampling port: can be used for auxiliary signal monitoring that meets design requirements.
- Compact surface mount architecture: The SM2 package facilitates integration into the corresponding RF PCB.
- It can be used in frequency generation links: suitable for evaluating second harmonic schemes in local oscillator and frequency synthesis systems.
Before purchasing, confirm whether the ordered model is KBA-40 or KBA-40+, verify the package, environmental label, actual inventory and batch information, and verify the device performance according to the target frequency and input power.
Frequently Asked Questions (FAQ)
Q1: What type of component is KBA-40?
A: The KBA-40 is a Mini-Circuits RF frequency multiplier, mainly used to increase the frequency of the input signal to twice the output frequency.
Q2: What is the output frequency range of KBA-40?
A: The manufacturer’s specifications list the output frequency range as 5.4–9.6 GHz. Based on the second harmonic relationship, the corresponding input frequency is 2.7–4.8 GHz.
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