A Highly Integrated HBT Down-converter MMIC Employing Optimally Designed Spiral Inductor Filters

摘要

In this article, a highly integrated down-converter monolithic microwave integrated circuit (MMIC), employing heterojunction bipolar transistors (HBT), is described for application to a one-chip transceiver solution for a Ku-band commercial wireless communication system. The down-converter MMIC includes a mixer, a filter, an amplifier and input/output matching circuits. Spiral inductor structures, employing SiN film, were used to suppress the LO and its second harmonic leakage signals. They were designed so that their self-resonance frequency was accurately tuned to the LO and its second harmonic frequencies, and were integrated in the down-converter MMIC.