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A new design is presented that combines a low-noise amplifier (LNA) with a new passive base-collector notch filter based on Jazz 0.18μm SiGe technology. Extra capacitor is introduced in notch filter, eliminating the operating-frequency input mismatch in formal base-collector notch filters. Results show that LNA obtains a 4 dB S21 enhancement of 14.1 dB and a 7 dB increase S11 of 15 dB at 20.5GHz, image rejection ratio is 33.5 dB. IIP3 is 3.43 dBm at the operating frequency for a power consumption of 18mW from a 3V power supply.

A high image rejection SiGe low noise amplifier using passive notch filter