Patent ID: 8744541

Claim:
A digital radio frequency receiver apparatus, comprising: a radio-frequency digitizer, configured to accept an analog input and to generate at least one stream of digital output bits at a rate set by a sampling clock; a digital signal synthesizer, configured to generate an output comprising at least one stream of digital output bits at a second clock rate; at least one multi-bit parallel digital mixer, configured in a circuit to receive a first digital input signal comprising the at least one stream of digital output bits at a rate set by a sampling clock and a second digital input signal comprising the at least one stream of digital output bits at a second clock rate, and to generate a multi-bit parallel output signal representing a product of the first digital input signal and the second digital input signal; at least one digital filter, configured to accept as an input the multi-bit parallel output signal of the at least one mixer, and to generate at least one digital output stream at a third clock rate, representing a filtered representation of the input; wherein at least one of the digitizer, synthesizer, mixer, and filter comprises at least one Josephson junction.