Analog computer studies of a Josephson junction show that the microwave‐induced steps in the dc current‐voltage curve may be used as ideal (zero impedance) voltage sources with which to bias a second junction. Biased on one of these steps, the second junction is a microwave
oscillator of precisely determined frequency. Because the biasing junction impedance →0 on a step, it contributes no noise to this second junction. A conceptual design using Dayem bridges fabricated as an integral part of a coplanar waveguide structure is proposed.