This design uses the extremely low noise amplifier BGB707L7ESD from Infineon and the 1420MHz surface acoustic wave filter produced in Taiwan to design a 1420MHz low noise bandpass amplifier.
Using this amplifier can amplify the weak neutral hydrogen signal received by the antenna, and in the second version of the design, a three-stage cascade of amplifiers was completed to successfully increase the gain of the amplifier to more than 37db, so that the ADC can perform high-speed acquisition. A low-noise linear power supply was added to the second version of the LNA design.
It was my first time to design a low-noise amplifier, and I was not very familiar with components, so I designed a first-stage amplifier and added a surface acoustic wave filter. To test the correctness of the circuit. After the first successful design, some minor problems were discovered. The first was the power supply problem. The amplifier could only be tested indoors and could not be carried outdoors. The second was that the input and output labels were not obvious, and reverse plugging often occurred.
The second version uses three-stage amplification, the amplification gain has been significantly improved, and a linear power supply powered by a dedicated RF amplifier is used. This circuit will be introduced in detail in the next design. Obvious arrows are added to the signal input and output to remind users of the signal flow direction. In the design of the second version, the issue of impedance matching was also taken into consideration. You can use Lichuang Assistant to calculate line width very conveniently, but you can also use the more powerful calculation tool in the picture below.
This is a spectrum of neutral hydrogen obtained using three levels of amplification, and the effect is very obvious.
The picture above shows the performance of the designed amplifier on a spectrum analyzer.
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The second version uses three-stage amplification, the amplification gain has been significantly improved, and a linear power supply powered by a dedicated RF amplifier is used. This circuit will be introduced in detail in the next design. Obvious arrows are added to the signal input and output to remind users of the signal flow direction. In the design of the second version, the issue of impedance matching was also taken into consideration. You can use Lichuang Assistant to calculate line width very conveniently, but you can also use the more powerful calculation tool in the picture below.
1M1-3P2-R5/2-1M7QE
