CMOS LNA with tunable resonance frequency

The tuned Low Noise Amplifier (LNA) is an attractive solution for applications asking for both low power consumption and low noise figure (NF), such as wireless sensors. This paper presents the CMOS LNA with a tunable resonance frequency analysis focused on noise-linearity-bandwidth trade-offs required for implementing a variable resonance frequency. To change the resonance frequency the MOS capacitor capacitance dependence on the DC gate voltage is used. By employing a MOS capacitor bank, the proposed LNA concept can cover a large frequency band, in a few programmable steps.