**.subckt tb_DFF
VSS vss GND {vss} 
VDD vdd vss {vdd} 
Vref A vss PULSE(0 {vin} 0 1p 1p {Tref/2} {Tref}) DC {vin} AC 0 
Vdiv B vss PULSE(0 {vin} 0 1p 1p {1.05*Tref/2} {1.05*Tref}) DC {vin} AC 0 
C1 Up vss 10f m=1
x2 Up vdd Q net3 net2 net4 vss net1 pfd_cp_interface_pex_c
x1 vdd A Q B vss dff_pfd_pex_c
**** begin user architecture code


* Parameters
.param kp = 0.9
.param vdd = kp*1.8
.param vss = 0.0
.param vin = 1.8
.param fref = 100e6
.param Tref = 1/fref
.param C = 1f

.options TEMP = 50.0

* Models
.lib ~/skywater/skywater-pdk/libraries/sky130_fd_pr_ngspice/latest/models/corners/sky130.lib SS
.include ~/caravel_analog_fulgor/xschem/simulations/pfd_cp_interface_pex_c.spice
.include ~/caravel_analog_fulgor/xschem/simulations/dff_pfd_pex_c.spice

.ic v(net3) = 0.0
.ic v(net4) = 0.0
.ic v(Q) = 0.0

* Data to save
.save all

* Simulation
.control
	tran 0.1ns 200ns
	*meas tran Tosc trig v(out) val=0.9 fall=5 targ v(out) val=0.9 fall=15
	*meas tran Td1  trig v(out) val=0.9 fall=5 targ v(out1) val=0.9 rise=6
	*meas tran Td2  trig v(out1) val=0.9 fall=5 targ v(out2) val=0.9 rise=6
	*meas tran Td3  trig v(out2) val=0.9 fall=5 targ v(out) val=0.9 rise=5
	*let  T = Tosc/10.0
	*let  f = 1/T
	*let Td = 1/(2*3*f)
	*print T f Td
	write tb_DFF_nor_tran.raw
	plot v(A)+2 v(B)+2 v(Q)
.endc


**** end user architecture code
**.ends
.GLOBAL GND
** flattened .save nodes
.end