Model: LNA-30
Version: 1.0 — October 2025
Author: Elerain
1. Overview
The LNA-30 is a compact, wide-band low noise amplifier designed for use with EMC near-field probes, EMI diagnostics, and RF measurement systems.
It provides high gain (30 dB) and low noise figure, ensuring accurate signal capture even from weak electromagnetic emissions.
The module supports frequencies from 30 MHz to 1 GHz and operates from a +5 V DC power supply via a USB-C connector.
2. Features
• Frequency range: 30 MHz – 1000 MHz
• Typical gain: +30 dB
• Noise figure: < 2 dB (typ.)
• Power supply: +5 V DC, < 100 mA
• RF connectors: SMA female (50 Ω)
• Compact PCB: 51 mm × 26 mm (typ.)
• Designed for EMC near-field probes or antenna pre-amplification
3. Applications
• EMC / EMI debugging of electronic circuits
• Signal amplification for near-field magnetic and electric probes
• Pre-amplifier for spectrum analyzers or SDR receivers
• RF measurement in low-signal environments
4. Electrical Specifications
|
Parameter |
Min | Typ | Max |
Unit |
| Supply Voltage |
4.8 |
5.0 | 5.5 |
V |
| Supply Current |
– |
30 | 100 |
mA |
| Frequency Range |
30 |
– | 1000 |
MHz |
| Gain |
28 |
30 | 32 |
dB |
| Input/Output Impedance |
– |
50 | – |
Ω |
| Noise Figure |
– |
2.0 | 2.5 |
dB |
| Max Input Power |
– |
– | –25 |
dBm |
| Max Output Power (1 dB comp.) |
– |
– | +5 |
dBm |
6. Connections and Setup
Step 1 – RF Connections
• Connect your near-field probe to the IN (left SMA) port.
• Connect the OUT (right SMA) port to your spectrum analyzer, oscilloscope, or receiver using a 50 Ω coaxial cable.
• Observe correct signal flow direction (→ arrows on PCB).
Step 2 – Power
• Connect a standard USB-C cable with +5 Vdc power source to the PWR port.
• Ensure the source can supply +5 V / 100 mA (typical).
• The module draws less than 100 mA at full gain.
7. Usage Notes
• Always terminate the output with 50 Ω.
• Keep cables reasonably short to minimize losses.
• For high-frequency measurements (> 500 MHz), use quality low-loss coax.
• Avoid applying DC or strong RF power to the input.
• Do not exceed +5.5 V on the power input.
8. Maintenance & Handling
• Handle the PCB by edges to prevent ESD damage.
• Keep connectors clean and dust-free.
• Store at room temperature and low humidity.
9. Safety Information
• The LNA-30 is a low-voltage device and poses minimal electrical hazard.
• Do not connect directly to transmitters or high-power RF sources.
• Use only with passive near-field probes or measurement instruments.
