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Design of superconducting single flux quantum decimation filters

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6 Author(s)
Hasegawa, H. ; Superconductivity Res. Lab., Int. Superconductivity Technol. Center, Tokyo, Japan ; Hashimoto, T. ; Nagasawa, S. ; Suzuki, Hideo
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A third-order sine decimation filter was designed for a Σ-Δ A/D converter with a second-order modulator. The sine filter was formed from multistage decimation structure, which was constructed from the cascade connection of third-order sine filters with a decimation factor of 2. A counter, consisting of single-flux-quantum (SFQ) toggle flip-flops (TFF) with destructive readout, was used to reduce the circuit scale. The sine filter with a decimation factor of 2, which is the circuit that operates at the highest frequency in a multistage decimation structure, operated up to the clock frequency of 18 GHz in a circuit simulation. A sine filter with a decimation factor of 32 was calculated to require 6700 Josephson junctions that consume 1.9 mW

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )