| 摘要 |
<p>The converter includes a double-junction superconducting quantum interference device (SQUID) voltage divider circuit, a double-junction SQUID voltage selector circuit and an output circuit in which currents generated by the selected binary voltages are added together to produce an analogue output current that represents the digital input. The voltage divider circuit includes a reference clock operating at a reference clock frequency and N stages of double-junction divider SQUID flip-flops, where N is the number of bits of the digital input. Two of the N stages are an MSB divider SQUID flip-flop and an LSB divider SQUID flip-flop corresp. to the MSB and the LSB, respectively, of the digital input. The divider SQUID flip-flops connected together in a cascade arrangement divide a reference voltage Vo into N-1 discrete binary voltages. The reference voltage Vo is generated by way of AC Josephson effect, thus fixing reference voltage to the reference clock frequency.</p> |
