Design of a Low Noise Amplifier with Adjustable Gain for 5G Terminals
Aiming at the problem that wireless receivers need to amplify the signals of different intensities to different degrees,a variable-gain low noise amplifier operating in the 5G communication band from 3 to 5 GHz was designed in WIN's 0.15 μm GaAs pHEMT process.The amplifier included two stages of amplification circuits,both of which adopted a self-biased structure to reduce the number of ports,and the continuously adjustable range of the system gain of about 39.3 dB(-3.5-35.8 dB)can be achieved by adjusting the control voltage of the second stage amplification circuit to vary from 0 to 5 V.The footprint is 0.94× 1.24 mm2.At a control voltage of 0 V,the system noise is 0.53±0.01 dB,and the gain is 35.5±0.35 dB.At the center frequency point of 4 GHz,the OP1dB is 13.2 dBm,and the OIP3 reaches 32.7 dBm,indicating that the system has a good linearity.
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