Mixed Mode ring oscillator
*
*
*             R1
*       +-\/\/\/-+
*       |        | 
*       |   |\   |  |\
*     1 +---| o--+--| o--+ 3
*       |   |/   2  |/   |
*       |  7414    7404  |
*       |       ||       |
*       +-------||-------+
*               ||
*                 C1
*
*
*
.option library expand acct

* We use a schmitt trigger for the input stage 
X1  1 2  7414
+	params: IO_LEVEL=3
* We use the IO_LEVEL=3 parameter to get an elaborate IO model, with clamping 
* diodes on the inputs, and realistic I-V curves.  This is usually
* important only with capacitively coupled inputs like this one.

* The other stage is a conventional inverter
X2  2 3  7404

* Feed back resistor and capacitor
R1 1 2 330
C1 1 3 1600pF

.probe
.tran 50ns 5us
.lib eval.lib
.plot tran V(1) V(2) V(3)
.END