A 28-GHz SiGe up-conversion mixer using a series-connected triplet for higher dynamic range and improved IF port return loss

This work presents a fully integrated SiGe microwave up-conversion mixer, utilizing a new circuit topology consisting of a common-base, series-connected triplet at the IF port to achieve a significant improvement in dynamic range. This circuit functions with an IF signal of 1.25 GHz, and has an input 1-dB compression point (IP_1dB) of -6.8 dBm, for an RF output at 28 GHz. The circuit operates over a frequency range from 19 to 31 GHz, with a maximum conversion gain of 1 dB. The mixer can operate over an IF range from 1 to 10 GHz, while maintaining an IF port return loss greater than 10 dB.