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An analog baseband circuit made in a 0.35-μm SiGe BiCMOS process is presented for China Multi-media Mobile Broadcasting(CMMB) direct conversion receivers.A high linearity 8th-order Chebyshev low pass filter(LPF) with accurate calibration system is used.Measurement results show that the filter provides 0.5-dB pass-band ripple,4% bandwidth accuracy,and-35-dB attenuation at 6 MHz with a cutoff frequency of 4 MHz.The current steering type variable gain amplifier(VGA) achieves more than 40-dB gain range with excellent temperature compensation.This tuner baseband achieves an OIP3 of 25.5 dBm,dissipates 16.4 mA under a 2.8-V supply and occupies 1.1 mm2 of die size.
An analog baseband circuit made in a 0.35-μm SiGe BiCMOS process is presented for China Multi-media Mobile Broadcasting (CMMB) direct conversion receivers. A high linearity 8th-order Chebyshev low pass filter (LPF) with accurate calibration system is used. results show that the filter provides 0.5-dB pass-band ripple, 4% bandwidth accuracy, and -35-dB attenuation at 6 MHz with a cutoff frequency of 4 MHz. Current steering type variable gain amplifier (VGA) achieves more than 40 -dB gain range with excellent temperature compensation.This tuner baseband achieves an OIP3 of 25.5 dBm, dissipates 16.4 mA under a 2.8-V supply and occupies 1.1 mm2 of die size.