Digital Programmable Frequency Divider
AssigneeHypres, Inc.
InventorAlexander F. Kirichenko
Life of this patent
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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), and 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.
Claims21
A digital programmable frequency divider using Single Flux Quantum (SFQ) logic elements providing frequency division by any natural number.
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.