Mini-Circuits recommends a 4-layer PCB with a solid ground plane on the bottom layer, and a via-stitched ground plane on the top layer. The GALI-19+ should be placed near the edge of the board, with the input and output ports facing away from each other. A low-impedance path to ground is essential for optimal performance.
To achieve the best possible noise figure, ensure that the input and output impedances are well-matched to 50 ohms, and that the device is operated within its recommended operating conditions. Additionally, use a high-quality, low-noise power supply, and minimize the length of the input and output transmission lines.
The maximum safe operating temperature for the GALI-19+ is 85°C. Operating the device above this temperature can reduce its reliability and lifespan. It's essential to ensure proper heat sinking and airflow to maintain a safe operating temperature.
While the GALI-19+ is optimized for 50 ohm systems, it can be used in non-50 ohm systems with some performance degradation. However, the device's noise figure, gain, and return loss may be affected. It's essential to consult with a Mini-Circuits application engineer to determine the feasibility of using the GALI-19+ in a non-50 ohm system.
The GALI-19+ requires a positive bias voltage of 12-15V, with a recommended current limit of 100mA. A simple resistive divider network can be used to bias the device, but it's essential to ensure that the bias voltage is well-regulated and noise-free to maintain optimal performance.
GALI-19+ datasheet
by Mini-Circuits
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