Abstract
A wideband CMOS variable gain low noise amplifier (VGLNA) based on a single-to-differential (S2D) stage and resistive attenuator is presented for TV tuner applications. Detailed analysis of input matching, noise figure (NF) and linearity for S2D is given. A highly linear passive resistive attenuator is proposed to provide 6 dB attenuation and input matching for each gain stage. The chip was fabricated by a 0.18 μm 1P6M CMOS process, and the measurements show that the VGLNA covers a gain range over 36.4 dB and achieves a maximum gain of 21.3 dB, a minimum NF of 3.0 dB, an IIP3 of 0.9 dBm and an IIP2 of 26.3 dBm at high gain mode with a power consumption less than 10 mA from a 1.8 V supply.
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