Analog-computer studies on microwave mixing in superconducting weak links

The dc characteristics of superconducting weak links, irradiated by one and two microwave frequencies and the dependence of the absorbed microwave power on the dc current, are evaluated. Within the constant voltage steps, the ac current generated in the weak link is synchronous with the incident microwaves or their mixing products. In the case of two incident microwave frequencies within the constant voltage steps, the dependence of the ratio of power-absorption variation on the impressed dc current at the two frequencies is governed by modified Manley-Rowe equations.