Digital inversions*.tran 1e-8 1e-6*v1 1 0 0.0 pulse(0 1 0 1e-8 1e-8 0.25e-6 0.5e-6)r1 1 0 1k*a1 [1] [2] adc.model adc adc_bridge*a2  2  3 inva3  2 ~4 inva4 ~2  5 inva5 ~2 ~6 inv.model inv d_inverter*a6 [2 ~4] 7 nand.model nand d_nand*a8 [2 3 4 5 6 7] [12 13 14 15 16 17] dac.model dac dac_bridge*.end