Digital models
*
* This circuit contains a nand gate oscillator enabled by
* a pulse input after 20nS.  Node 1 is an analog node.
* Nodes 2 and 3 are digital nodes.
*
.tran 1e-8 1e-7
*
v1 1 0 0.0 pulse(0 1 2e-8 1e-9 1e-9)
*
r1 1 0 1k
*
a1 [1] [2] atod1
.model atod1 adc_bridge (in_low=0.25 in_high=0.75
+                        rise_delay=1e-9  fall_delay=1e-9)
*
a2 [2 3] 3 nand
.model nand d_nand (rise_delay=1e-9 fall_delay=1e-9)
*
.end