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A broadband CMOS intermediate frequency(IF) variable-gain amplifier(VGA) for DRM/DAB tuners is presented.The VGA comprises two cascaded stages:one is for noise-canceling and another is for signal-summing.The chip is fabricated in a standard 0.18 μm 1P6M RF CMOS process of SMIC.Measured results show a good linear-in-dB gain characteristic in 28 dB dynamic gain range of -10 to 18 dB.It can operate in the frequency range of 30-700 MHz and consumes 27 mW at 1.8 V supply with the on-chip test buffer.The minimum noise figure is only 3.1 dB at maximum gain and the input-referred 1 dB gain compression point at the minimum gain is -3.9 dBm.
A broadband CMOS intermediate frequency (IF) variable-gain amplifier (VGA) for DRM / DAB tuners is presented. The VGA comprises two cascaded stages: one is for noise- canceling and another is for signal- summing. The chip is fabricated in a standard 0.18 μm 1P6M RF CMOS process of SMIC. Measured results show a good linear-in-dB gain characteristic in 28 dB dynamic gain range of -10 to 18 dB. It can operate in the frequency range of 30-700 MHz and consumes 27 mW at 1.8 V supply with the on-chip test buffer. The minimum noise figure is only 3.1 dB at maximum gain and the input-referred 1 dB gain compression point at the minimum gain is -3.9 dBm.