A 71–76GHz low noise amplifier with integrated image reject filter and single balanced down converter mixer

An RF receiver front end for EBAND communication in the lower band 71-76GHz frequency range was designed and fabricated in IBM 0.12μm SiGe technology. The LNA composed of four amplification stages, exhibits more than 15dB gain and a NF of less than 6dB in the entire frequency band. A steep two chain stop band filter is used to reject image noise with better than 18dB image rejection. The LNA is followed by a single balanced active down converting mixer used to convert the received signal to the 8.5GHz IF frequency. The measured mixer conversion gain is around 4.5dB with a NF of 14dB. The above performance enables a super-heterodyne realization of a complete EBAND receiver with excellent image rejection.