DC–200 MHz Low-Noise Amplifier with Adjustable Gain
Product Overview
The DC–200 MHz Low-Noise Amplifier (LNA) is a wideband signal amplification and conditioning solution designed for laboratory instrumentation, precision measurement, and high-speed data acquisition systems. Covering frequencies from DC to 200 MHz, it combines a low-noise amplifier with a digitally controlled attenuator to provide flexible gain and precise output signal adjustment.
With selectable 20 dB and 40 dB gain configurations, up to 31 dB of attenuation in 1 dB steps, and a DC-coupled signal path, this module is designed to amplify low-level signals while helping prevent downstream equipment, such as ADCs, from being overdriven. It operates from a single DC power supply and uses 50-ohm input and output interfaces.
Key Features
• Wideband frequency coverage from DC to 200 MHz
• Selectable 20 dB or 40 dB gain configuration
• Integrated 31 dB digital attenuator with 1 dB step resolution
• Low-noise design for sensitive signal measurement
• DC-coupled input-to-output signal path
• Gain flatness of ±0.5 dB or better
• Input and output VSWR of 1.5 or less
• 50-ohm input and output impedance
• SMA signal interfaces
• Single-supply operation with a recommended +12 V DC supply
• Compact module for laboratory and embedded system integration
• Custom configurations available for selected project requirements
Technical Specifications
Product Type: Wideband Low-Noise Amplifier (LNA)
Frequency Range: DC to 200 MHz
Gain Configuration: 20 dB / 40 dB
Amplifier Core Gain: 43 dB
Integrated Attenuator: 31 dB
Attenuation Resolution: 1 dB
In-Band Gain Flatness: ≤ ±0.5 dB
Noise Figure: ≤ 0.8 dB
Target Input Noise Density: 1.2 nV/√Hz
Input VSWR: ≤ 1.5
Output VSWR: ≤ 1.5
Input Impedance: 50 Ω
Output Impedance: 50 Ω
Signal Coupling: DC-coupled
Connector Type: SMA-50KFD
Power Supply Range: +8 V to +17 V DC
Recommended Supply: +12 V DC
Operating Current: ≤ 150 mA
Operating Temperature: -10°C to +70°C
Attenuation Control: Floating or grounded control input
Attenuation Control Behavior: Floating = full gain; grounded = 20 dB attenuation, according to the source specification
Approximate Weight: 100 g
Approximate Length: 130 mm
Applications
• High-speed ADC front-end signal conditioning
• Low-level sensor signal amplification
• Oscilloscopes and electronic measurement equipment
• RF and IF broadband signal amplification
• Laboratory instrumentation and test systems
• Scientific research and experimental electronics
• Precision data acquisition systems
• Wideband signal detection and monitoring
How It Works
The amplifier increases the level of weak input signals across a bandwidth extending from DC to 200 MHz. Its gain configuration and digital attenuation function allow the output level to be adjusted to suit downstream equipment.
The integrated attenuator supports 31 attenuation settings from 0 dB to 31 dB in 1 dB increments. This provides additional flexibility when matching signal levels to ADC inputs and other sensitive measurement equipment.
FAQ
Q1: What is the operating frequency range?
A: The amplifier covers DC to 200 MHz.
Q2: What gain options are available?
A: The product supports 20 dB and 40 dB gain configurations. Confirm the requested configuration when ordering.
Q3: Does it include a digital attenuator?
A: Yes. It includes a digitally controlled attenuator with up to 31 dB attenuation and 1 dB adjustment steps.
Q4: Can the output signal level be adjusted?
A: Yes. The attenuation function allows the output level to be adjusted to help prevent downstream equipment from being overdriven.
Q5: Does the signal path support DC?
A: Yes. The signal path is DC-coupled from input to output.
Q6: What power supply is required?
A: The specified operating supply range is +8 V to +17 V DC, with +12 V DC recommended.
Q7: What connectors does it use?
A: The source specification lists an SMA-50KFD connector. Please confirm the exact connector arrangement and mating requirements before integration.
Q8: Is customization available?
A: Custom gain configurations, attenuation control methods, enclosure options, and connector options may be available upon request.