Abstract: Digital mixers which permit mixing of asynchronous signals may be constructed of Rapid Single Flux Quantum (RSFQ) logic elements. The logic elements may include an RSFQ non-destructive readout cell (NDRO), an RSFQ D flip-flop, an RSFQ XOR circuit, and an RSFQ T flip-flop. A binary tree arrangement of T flip-flops can be used to provide in-phase and quadrature phase-divided replicas of a reference signal. The mixing elements can be either an XOR circuit, a dual port NDRO circuit functioning as a multiplexer or an RS type NDRO functioning as an AND gate. The RSFQ logic elements utilize Josephson junctions which operate in superconducting temperature domains.

Abstract: Digital mixers which permit mixing of asynchronous signals are constructed of Rapid Single Flux Quantum (RSFQ) logic elements. The logic elements may include an RSFQ non-destructive readout cell (NDRO), an RSFQ D flip-flop, an RSFQ XOR circuit, and an RSFQ T flip-flop. A binary tree arrangement of T flip-flops can be used to provide in-phase and quadrature phase-divided replicas of a reference signal. The mixing elements can be either an XOR circuit, a dual port NDRO circuit functioning as a multiplexer or an RS type NDRO functioning as an AND gate. The RSFQ logic elements utilize Josephson junctions which operate in superconducting temperature domains.

Abstract: The present invention discloses an ALU (Arithmetic Logic Unit) that can be operated as an OR gate, an AND gate, an adder gate and an exclusive OR gate using a half adder that uses a superconductor rapid single flux quantum logic device. The ALU using a half adder includes a half adder using a superconductor rapid single flux quantum logic device as a logic circuit, and a switching unit that has input ports respectively connected to a sum output port and a carry output port of the half adder and is operated as an OR gate, an AND gate, an adder gate and an exclusive OR gate using output signals of the half adder. The switching unit includes a first switch having an input port connected to the sum output port of the half adder, a second switch having an input port connected to the carry output port of the half adder and an output port connected to an output port of the first switch, and a third switch having an input port connected to the carry output port of the half adder.

Abstract: Digital mixers which permit mixing of asynchronous signals is constructed of Rapid Single Flux Quantum (RSFQ) logic elements. The logic elements may include an RSFQ non-destructive readout cell (NDRO), an RSFQ D flip-flop, an RSFQ XOR circuit, and an RSFQ T flip-flop. A binary tree arrangement of T flip-flops can be used to provide in-phase and quadrature phase-divided replicas of a reference signal. The mixing elements can be either an XOR circuit, a dual port NDRO circuit functioning as a multiplexer or an RS type NDRO functioning as an AND gate. The RSFQ logic elements utilize Josephson junctions which operate in superconducting temperature domains.

Abstract: The present invention discloss an ALU that can be operated as an OR gate, an AND gate, an adder gate and an exclusive OR gate using a half adder that uses a superconductor rapid single flux quantum logic device. The ALU using a half adder includes a half adder using a superconductor rapid single flux quantum logic device as a logic circuit, and a switching unit that has input ports respectively connected to a sum output port and a carry output port of the half adder and is operated as an OR gate, an AND gate, an adder gate and an exclusive OR gate using output signals of the half adder. The switching unit includes a first switch having an input port connected to the sum output port of the half adder, a second switch having an input port connected to the carry output port of the half adder and an output port connected to an output port of the first switch, and a third switch having an input port connected to the carry output port of the half adder.

Abstract: A dual function superconducting digitizer circuit which can selectively function either as an analog-to-digital converter (ADC) or as a time-to-digital converter (TDC). Superconducting ADCs and TDCs can provide performance far superior to that obtained using conventional electronics by taking advantage of the intrinsic properties—high switching speed, quantum accuracy, dispersion-less transmission lines, radiation hardness, and extremely low power dissipation—of superconductivity. Since both ADC and TDC functions are desired in most measurement systems, a dual-function digitizer is not only more attractive from a system integration perspective but is also more marketable.

Abstract: A dual function superconducting digitizer circuit which can selectively function either as an analog-to-digital converter (ADC) or as a time-to-digital converter (TDC). Superconducting ADCs and TDCs can provide performance far superior to that obtained using conventional electronics by taking advantage of the intrinsic properties—high switching speed, quantum accuracy, dispersion-less transmission lines, radiation hardness, and extremely low power dissipation—of superconductivity. Since both ADC and TDC functions are desired in most measurement systems, a dual-function digitizer is not only more attractive from a system integration perspective but is also more marketable.