Design of superconducting single flux quantum decimation filters

A third-order sine decimation filter was designed for a Sigma-Delta AID con verter with a second-order modulator. The sine alter was formed from multis tage decimation structure, which was constructed from the cascade connectio n of third-order sine alters with a decimation factor of 2, A counter, cons isting of single-flux-quantum (SFQ) toggle flip-flops (TFF) with destructiv e readout, was used to reduce the circuit scale. The sine alter with a deci mation factor of 2, which is the circuit that operates at the highest frequ ency in a multistage decimation structure, operated up to the clock Frequen cy of 18GHz 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.