Superconducting delta-sigma oversampling A/D converter

A superconducting delta-sigma analog-to-digital (A/D) converter is presented. The converter uses a low-pass filter instead of the integrator found in the usual delta-sigma architecture. The converter is analyzed by a behavior-level simulation package as well as the circuit simulator JSIM. Its performance is compared to that of the standard first-order delta-sigma converter. The simulation shows that this converter can achieve a 70-dB signal-to-noise ratio (S/(N+D)) with an oversampling ratio of 128. This corresponds to an 11-b resolution. The signal bandwidth is 4 MHz if the sampling rate is 1 GHz.<
>