Abstract
A variable gain low noise amplifier (VGLNA) with dual regulation schemes of gain was proposed and verified based on the TSMC0.18$\mu$ CMOS process. The gain stage of the VGLNA is mainly composed of a MOS transistor switch array and a tunable transconductance regulator. The MOS transistor switch array realizes the discrete adjustment of gain by switching on and off of the 8 MOS switches to change the load of the circuit. The tunable transconductance regulator located at the load position completes the continuous regulation of gain by controlling its bias voltage. The results showed that the gain of the VGLNA can be adjusted discretely and the continuously in the range of -7dB $\sim 20$ dB with the minimum noise factor of 3.7dB and the maximum linearity of IIP3 of -2.5dBm under frequency of 5.8 GHz. The VGLNA with dual adjustments of gain by both digital mode and analog mode will have a wider range of applications.
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