look for a CCO(current-controlled circiut) best in .18 technology

[hsiung06]

Hi! ALL:
Can anyone tell why the CCO circuit in the web address below is not oscillating?Please help!:|



https://obrazki.elektroda.pl/60_1347863319.png

 

[not-a-moderator]

I don't see an initial drive on the FET gates?

 

[hsiung06]

I don't see an initial drive on the FET gates?

Thanks for reply.
First , I used Hspice to simulate the circuit shown on the web site. Please help if you see any error. The program is compiled with no error. However, the circuit is not self-oscillating.:-|

*******netlist file*********************
.subckt cco n1_g p1_d vdd vdds gnd gnds
Mp1 p1_d gnd vdd vdds mepch L=0.25u W=0.5u
mn1 p1_d n1_g gnd gnds mench L=0.3u W=3u
.ends

.subckt ccoc n1_g out1 out2
Xcco1 n1_g out1 vdd vdds gnd gnds cco
Xcco2 out1 out2 vdd vdds gnd gnds cco
Xcco3 out2 n1_g vdd vdds gnd gnds cco
.ends

************.sp file*****************
.lib '/home/graduate/m0047225/mm018.l' tt_m
.inc 'vcotest6.netlist'

.global vdd vdds gnd gnds

vvdd vdd 0 1.8v
vvdds vdds 0 1.8v
vgnd gnd 0 0
vgnds gnds 0 0


Xccoc1 n1_g out1 out2 ccoc

*output initialization
.ic i(n1_g)=0
.ic v(n1_g)=0
.ic v(out1)=0
.ic v(out2)=0


Vn1_g n1_g 0 1.8v

.tran 0.1ns 1000ns
.probe tran
.option post
.op
*.option autostop
.end