Numerical simulations of Josephson waveform synthesizer driven by current pulses without in-band components
✍ Scribed by Fuminori Hirayama; Masaaki Maezawa; Motohiro Suzuki
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 329 KB
- Volume
- 426-431
- Category
- Article
- ISSN
- 0921-4534
No coin nor oath required. For personal study only.
✦ Synopsis
The pulse-driven Josephson junction array is a promising candidate for an accurate waveform synthesizer. The accuracy of the synthesized waveform is chiefly limited by the in-band frequency components of the driving current because they couple to the output signal through parasitic circuit elements and are difficult to filter out. In this study, we propose a more accurate waveform synthesis method, in which the array is driven by current pulses which have the same waveform as the impulse response of the ideal bandpass filter. Simulations have shown that the current amplitude of the constant-voltage step of a junction driven by the filtered pulses exceeds 70% of the Josephson critical current in a wide range of output signals. Synthesis of a sine wave using this method was also demonstrated by simulation.