Abstract

A 9.9 % 10.7GH z down converter circuit, suitable for anti-burglar alarm systems, has been designed and realized in GaAs MMIC technology. The circuit transmits an RF signal towards a target and receives its frequency-shifted (Doppler effect) reflection, detecting possible movements of the target. In the paper a schematic description and details about the design methodology for the Di­electric Resonator oscillator and the Dual-FET mixer are given. Small and large signal measurements on the realized circuit are also presented.