**.subckt tb_loop_filter
VSS vss GND {vss} 
vdd vdd vss {vdd} 
Vref A vss PULSE(0 1.0 0 1p 1p {Tref/2} {Tref}) DC {vin} AC 0 
x1 vss A vc loop_filter
x2 vss A vc_pex loop_filter_pex_c
**** begin user architecture code


* Parameters
.param kp = 1.0
.param vdd = kp*1.8
.param vss = 0.0
.param vin = vdd
.param fref = 5e6
.param Tref = 1/fref
.param iref = 100u
.param vd0 = 0.0
.param R1 = 1.6k
.param C1 = 33.5p
.param C2 = 6.7p

.options TEMP = 50.0
.options RSHUNT = 1e20

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

* Data to save


* Simulation
.control

	tran 0.01ns 200ns
	meas tran t1 when v(vc)=0.63
	meas tran t2 when v(vc_pex)=0.63
	let R = t1/0.5p
	let Rpex = t2/05.p
	print R Rpex
	plot v(vc) v(vc_pex)
.endc


**** end user architecture code
**.ends

* expanding   symbol:  loop_filter.sym # of pins=3
* sym_path: /home/dhernando/caravel_analog_fulgor/xschem/loop_filter.sym
* sch_path: /home/dhernando/caravel_analog_fulgor/xschem/loop_filter.sch
.subckt loop_filter  vss in vc_pex
*.iopin in
*.iopin vss
*.iopin vc_pex
XC1 vc_pex vss sky130_fd_pr__cap_mim_m3_1 W=25 L=25 MF=25 m=25
XC2 in vss sky130_fd_pr__cap_mim_m3_1 W=20 L=20 MF=9 m=9
XR2 vc_pex net1 vss sky130_fd_pr__res_high_po_5p73 W=5.73 L=22.92 mult=1 m=1
XR1 vc_pex net1 vss sky130_fd_pr__res_high_po_5p73 W=5.73 L=22.92 mult=1 m=1
XR3 net1 in vss sky130_fd_pr__res_high_po_5p73 W=5.73 L=22.92 mult=1 m=1
.ends

.GLOBAL GND
** flattened .save nodes
.end