The combination of resonant tunneling diodes (RTDs) and heterostructure fieid-effect transistors (HFETs) provides a versatile technology for designing ultra-hgh-speed analog and digital circuits. Here we demonstrate an RTD-KFET comparator circuit that operates up to 3 GHz clock frequency. The RTD based comparator allows us to employ 75% fewer devices than all-transistor comparators. The circuit is measured to have a single-tone spurfree-dynamic range of at least 40 dB and a sensitivity of 5 mV at a 2 GHz clock.

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