Digital programmable frequency divider
AssigneeHypres, Inc.
InventorAlexander F. Kirichenko
Life of this patent
Estimating the term…
Abstract
A digital programmable frequency divider is constructed of Rapid Single Flux Quantum (RSFQ) logic elements. The logic elements may include an RSFQ non-destructive readout cell (NDRO), RSFQ D flip-flop and an RSFQ T flip-flop. A digital word comprising N bits is used to control the amount of frequency division and the frequency divider selectively imparts a respective frequency division for any of 2N states that can be represented by the digital word. The RSFQ logic elements utilize Josephson junctions which operate in superconducting temperature domains.
Claims20
A digital programmable frequency divider using Single Flux Quantum (SFQ) logic elements providing frequency division by any natural number, in which the Single Flux Quantum logic comprises one or more Rapid Single Flux Quantum (RSFQ) T flip-flops with their outputs selectively connected to their inputs via D-flip-flops.
A method for selective frequency division by any natural number, comprising the steps of:
- a. applying a source having a frequency to an input of an Rapid Single Flux Quantum (RSFQ) logic cell;
- b. selectively dividing the frequency received at said input, depending upon receipt of a Single Flux Quantum (SFQ) pulse at another input of said cell;
- and
- c. providing an output from said logic cell that is selectively frequency divided depending on whether said SFQ pulse is received.
A digital programmable frequency divider using Single Flux Quantum(SFQ) logic elements in which each RSFQ T flip-flop is connected to the output of a non-destructive readout (NDRO) cell and in which each NDRO cell is connected in series with other NDRO cells, forming a register.
A digital programmable frequency divider using Single Flux Quantum (SFQ) logic elements in which the Single Flux Quantum logic comprises one or more Rapid Single Flux Quantum (RSFQ) T flip-flops and the output of each T flip-flop is applied to an input of an RSFQ D flip-flop and each D flip-flop is connected in series with other D flip-flops.
A method for selective frequency division, comprising the steps of:
- a. applying a source having a frequency to an input of an Rapid Single Flux Quantum (RSFQ) logic cell;
- b. selectively dividing the frequency received at said input, depending upon receipt of a Single Flux Quantum (SFQ) pulse at another input of said cell;
- and
- c. providing an output from said logic cell that is selectively frequency divided depending on whether said SFQ pulse is received.
Dependencies are inferred from the claim text.