Fixing Satellite SNR: Optimize Bias-Tee Design to Rescue LNB Noise Figure
Your satellite system’s SNR is terrible, even with a premium LNB. You’re wasting money on components without seeing the performance benefits, making the whole system unreliable. The issue is often a poor impedance match between the Bias-Tee and the Low-Noise Block (LNB).1 To fix this, you must integrate matching considerations into the initial design phase, such as modifying ground planes, using tapered inductors, and pre-planning for matching networks. It’s a frustrating scenario I’ve seen many times in my 20 years as an engineer. A team invests in a top-of-the-line LNB with a fantastic noise figure, expecting stellar performance, only to be disappointed by the final system test results. They check […]
Fixing LNB Signal Saturation: Balance Low Noise Figure and High OIP3 in LNBs
Your satellite signal looks strong, but the data is corrupt and unusable. You’ve chased low noise, but now your LNB is saturated. The real problem is its non-linearity budget. To manage LNB non-linearity, you must focus on the system’s power dynamic range. The best method is a multi-stage LNA design. Use a low noise figure amplifier first, then a high OIP3 amplifier last. Add inter-stage attenuators to dynamically control power and prevent signal saturation. I thought I had the perfect setup. My new low-noise amplifier (LNA) had incredible gain, ensuring I could lock onto even the faintest satellite signals. The signal-to-noise ratio was fantastic on paper. But when I looked […]
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