Demonstration of 6-bit, 0.20-mVpp Quasi-Triangle Voltage Waveform Generator Based on Pulse-Frequency Modulation

Yoshitaka TAKAHASHI  Hiroshi SHIMADA  Masaaki MAEZAWA  Yoshinao MIZUGAKI  

IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.3   pp.194-197
Publication Date: 2014/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.194
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
single flux quantum,  superconducting integrated circuits,  Josephson junction,  D/A converter,  

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We present our design and operation of a 6-bit quasi-triangle voltage waveform generator comprising three circuit blocks; an improved variable Pulse Number Multiplier (variable-PNM), a Code Generator (CG), and a Double-Flux-Quantum Amplifier (DFQA). They are integrated into a single chip using a niobium Josephson junction technology. While the multiplication factor of our previous m-bit variable-PNM was limited between 2m-1 and 2m, that of the improved one is extended between 1 and 2m. Correct operations of the 6-bit variable-PNM are confirmed in low-speed testing with respect to the codes from the CG, whereas generation of a 6-bit, 0.20mVpp quasi-triangle voltage waveform is demonstrated with the 10-fold DFQA in high-speed testing.