driver 131 would receive a digital input of zero one on its two input terminals providing a current value of i s for current 131a current driver 130 would receive a digital input of one one giving a current 130a of zero as a result i s flows through both array segments 110 and 111 to ground if array segment 111 is to be selected alone current driver 131 receives a digital input of zero one giving a current 131a of i s while current driver 130 receives a digital input of one zero giving a current 130a of i s as described above through use of the scheme shown in fig9 a with the circuit of fig9 a sixteen bit binary input signal 150 is used to select the desired output voltage from the josephson converter without a decoder if some other digital input is used it would be necessary to provide a decoder to obtain the proper digital input for current drivers 130 145 similarly if a different current driver circuit were used a decoder would be required to decode the sixteen bit binary input signal and provide appropriate input signals to the current driver the current driver circuit shown in fig9 is matched to the binary input signal 150 to obviate the need for a decoder the semiconductor d a converter 100 receives the same input signal 150 as the josephson converter assuming that the semiconductor d a converter 100 generates nominally the same voltage as the josephson array then the values for the gain a of amplifier 101 and the series resistance r s are given by equ7 where u03b4 is the maximum absolute error in the d a output and i.