Ultra fast differential transimpedance digital amplifier for superconducting circuits
AssigneeHypres, Inc.
InventorsDeepnarayan Gupta, Amol Inamdar
Life of this patent
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Abstract
Supercooled electronics often use Rapid Single Flux Quantum (RSFQ) digital circuits. The output voltages from RSFQ devices are too low to be directly interfaced with semiconductor electronics, even if the semiconductor electronics are cooled. Techniques for directly interfacing RSFQ digital circuits with semiconductor electronics are disclosed using a novel inverting transimpedance digital amplifier in conjunction with a non-inverting transimpedance digital amplifier to create a differential transimpedance digital amplifier that permits direct interfacing between RSFQ and semiconductor electronics.
Claims18
An inverting transimpedance digital amplifier, comprising:
- a. a flip flop receiving at least one single flux quantum (SFQ) signal and passing it to an SFQ storage element;
- b. a Josephson junction circuit, receiving a negative bias current and selectively producing a negative voltage output or a substantially zero voltage output depending on the state of the SFQ storage element.
A differential transimpedance digital amplifier, comprising:
- a. a first and a second RS flip flop, receiving respective complementary single flux quantum (SFQ) input signals and producing a first SFQ output signal and a second SFQ output signal;
- b. a non-inverting transimpedance digital amplifier receiving the first SFQ output signal;
- c. an inverting transimpedance digital amplifier receiving the second SFQ output signal;
- and
- d. the output of the non-inverting transimpedance digital amplifier and the output of the inverting transimpedance digital amplifier being connected to produce a differential output signal sufficient to directly drive semiconductor components.
Dependencies are inferred from the claim text.