A SiGe HBT low noise amplifier using on-chip notch filter for K band wireless communication

Abstract In this paper a new notch filter topology has firstly been described. In order to improve the input match as well as enhance the gain on the operating frequency of 20.5 GHz, extra capacitor has firstly been added in the passive base-collector notch filter forming a new scheme, eliminating the operating-frequency ( op ) input mismatch in formal base-collector notch filters. EM simulations have shown that the LNA obtained 14.1 dB gain at 20.5 GHz and high image-rejection ratio (IRR) of 33.5 dB at image frequency of 15 GHz, and S 11 of - 15 dB was obtained compared to −8 dB without notch filter at operating frequency, NF was below 5 dB at gain peak frequency, power consumption was 18 mW at 3 V voltage supply, and IIP 3 was 3.43 dBm ensuring a high linearity in SiGe bipolar process.

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