because of different binary numbers being converted to form an analog signal leading to different combinations of logic states in the digit signals representing these numbers these current variations across the track resistances result in voltages appearing at the a and b terminals of switches 10 12 14 and 16 which vary from the reference voltage also as indicated due to the commonality of track resistances to switches 10 12 14 and 16 in causing such variations the resulting error cannot be remedied by laser trimming techniques fig3 shows a portion of a d a converter of the type shown in fig2 embodying the present invention the output amplifier circuit 54 and a portion of the reference voltage circuit 46 shown in fig2 are not shown in fig3 for purposes of simplicity additionally the digital signal register 44 shown in fig2 is not shown again in fig3 as its purpose there would be the same and so is understood however the remaining structure of the d a converter in fig2 is identical to that in fig3 except for voltage reference track 50 and ground track 52 which have been broken into four separated tracks 54 through 60 and five separate tracks 62 through 70 respectively as can be seen in more detail in fig3 each b terminal ground terminal of switches 10 12 14 and 16 has its own ground track 70 68 66 and 64 respectively additionally 2r resistor 22 has its own ground track 62 similarly seen in fig3 all the a terminals voltage reference terminals of switches 10 12 14 and 16 have their own voltage reference tracks 60 58 56 and 54 respectively each of the voltage reference tracks 54 through 60 extends from its corresponding switch.