A novel low-noise linear-in-dB intermediate frequency variable-gain amplifier for DRM/DAB tuners

【摘要】 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.更多还原

【Abstract】 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.更多还原