LNA circuit added
diff --git a/gds/lna/foldedcascode.GDS b/gds/lna/foldedcascode.GDS
new file mode 100644
index 0000000..e5ecf48
--- /dev/null
+++ b/gds/lna/foldedcascode.GDS
Binary files differ
diff --git a/xschem/lna/foldedcascode.sch b/xschem/lna/foldedcascode.sch
new file mode 100644
index 0000000..8c940d0
--- /dev/null
+++ b/xschem/lna/foldedcascode.sch
@@ -0,0 +1,223 @@
+v {xschem version=3.0.0 file_version=1.2 }
+G {}
+K {}
+V {}
+S {}
+E {}
+T {1} 2250 -90 0 0 0.4 0.4 {}
+T {1} 2330 -90 0 0 0.4 0.4 {}
+T {Folded Cascode LNA} 2770 -190 0 0 1 1 {}
+N 460 -540 460 -490 {
+lab=#net1}
+N 460 -540 600 -540 {
+lab=#net1}
+N 600 -540 740 -540 {
+lab=#net1}
+N 600 -580 600 -540 {
+lab=#net1}
+N 740 -540 740 -490 {
+lab=#net1}
+N 600 -680 600 -640 {
+lab=#net2}
+N 600 -780 600 -740 {
+lab=vdd}
+N 600 -610 700 -610 {
+lab=vdd}
+N 600 -710 700 -710 {
+lab=vdd}
+N 700 -780 700 -610 {
+lab=vdd}
+N 520 -710 560 -710 {
+lab=#net3}
+N 520 -710 520 -610 {
+lab=#net3}
+N 520 -610 560 -610 {
+lab=#net3}
+N 460 -660 520 -660 {
+lab=#net3}
+N 460 -680 460 -640 {
+lab=#net3}
+N 460 -780 460 -740 {
+lab=vdd}
+N 360 -460 420 -460 {
+lab=in}
+N 460 -430 460 -280 {
+lab=gnd}
+N 460 -460 560 -460 {
+lab=gnd}
+N 560 -460 560 -280 {
+lab=gnd}
+N 700 -610 700 -460 {
+lab=vdd}
+N 700 -460 740 -460 {
+lab=vdd}
+N 740 -430 740 -360 {
+lab=out}
+N 740 -400 980 -400 {
+lab=out}
+N 740 -360 740 -340 {
+lab=out}
+N 740 -340 760 -340 {
+lab=out}
+N 790 -360 850 -360 {
+lab=gnd}
+N 850 -360 960 -360 {
+lab=gnd}
+N 960 -360 960 -280 {
+lab=gnd}
+N 940 -440 940 -400 {
+lab=out}
+N 940 -540 940 -500 {
+lab=gnd}
+N 940 -540 1060 -540 {
+lab=gnd}
+N 1060 -540 1060 -280 {
+lab=gnd}
+N 480 -710 480 -610 {
+lab=gnd}
+N 460 -580 520 -580 {
+lab=gnd}
+N 520 -580 520 -280 {
+lab=gnd}
+N 480 -610 480 -580 {
+lab=gnd}
+N 780 -460 820 -460 {
+lab=#net4}
+N 820 -580 820 -460 {
+lab=#net4}
+N 820 -780 820 -700 {
+lab=vdd}
+N 820 -640 820 -580 {
+lab=#net4}
+N 820 -580 880 -580 {
+lab=#net4}
+N 940 -580 1100 -580 {
+lab=gnd}
+N 1100 -570 1100 -280 {
+lab=gnd}
+N 840 -670 910 -670 {
+lab=gnd}
+N 910 -670 910 -600 {
+lab=gnd}
+N 360 -280 1160 -280 {
+lab=gnd}
+N 360 -780 1160 -780 {
+lab=vdd}
+N 1100 -580 1100 -570 {
+lab=gnd}
+N 960 -600 960 -580 {
+lab=gnd}
+N 910 -600 960 -600 {
+lab=gnd}
+N 820 -340 860 -340 {
+lab=in}
+N 860 -340 860 -320 {
+lab=in}
+N 860 -320 880 -320 {
+lab=in}
+C {code.sym} 80 -260 0 0 {name=sT_MODELS
+only_toplevel=true
+format="tcleval( @value )"
+value="** manual skywater pdks install (with patches applied)
+* .lib \\\\$::SKYWATER_MODELS\\\\/models/sky130.lib.spice tt
+
+** opencircuitdesign pdks install
+.lib /foss/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt
+
+.param mc_mm_switch=0
+.param mc_pr_switch=0
+"
+spice_ignore=false}
+C {title-2.sym} 20 -40 0 0 {name=l1 author="Ryan Wans" rev=1.0}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/nfet_01v8.sym} 440 -460 0 0 {name=M2
+L=0.15
+W=22
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'"
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'"
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=nfet_01v8
+spiceprefix=X
+}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/pfet_01v8.sym} 760 -460 0 1 {name=M4
+L=0.15
+W=22
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'"
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'"
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/pfet_01v8.sym} 580 -610 0 0 {name=M7
+L=0.15
+W=22
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'"
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'"
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/pfet_01v8.sym} 580 -710 0 0 {name=M8
+L=0.15
+W=22
+nf=1
+mult=1
+ad="'int((nf+1)/2) * W/nf * 0.29'"
+pd="'2*int((nf+1)/2) * (W/nf + 0.29)'"
+as="'int((nf+2)/2) * W/nf * 0.29'"
+ps="'2*int((nf+2)/2) * (W/nf + 0.29)'"
+nrd="'0.29 / W'" nrs="'0.29 / W'"
+sa=0 sb=0 sd=0
+model=pfet_01v8
+spiceprefix=X
+}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 460 -610 0 1 {name=R7
+W=0.69
+L=0.35
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 460 -710 0 1 {name=R8
+W=0.69
+L=1.42
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 790 -340 1 0 {name=R9
+W=0.35
+L=1.0
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/cap_mim_m3_1.sym} 940 -470 2 0 {name=C2 model=cap_mim_m3_1 W=12.2 L=12.2 MF=1 spiceprefix=X}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 820 -670 0 1 {name=R11
+W=0.69
+L=0.8
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 910 -580 1 0 {name=R12
+W=0.69
+L=0.4
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {opin.sym} 980 -400 0 0 {name=out lab=out}
+C {ipin.sym} 360 -780 0 0 {name=vdd lab=vdd}
+C {ipin.sym} 360 -280 0 0 {name=gnd lab=gnd}
+C {ipin.sym} 360 -460 0 0 {name=in lab=in}
+C {ipin.sym} 880 -320 2 0 {name=bias lab=bias}
diff --git a/xschem/lna/foldedcascode.sym b/xschem/lna/foldedcascode.sym
new file mode 100644
index 0000000..bfcba89
--- /dev/null
+++ b/xschem/lna/foldedcascode.sym
@@ -0,0 +1,27 @@
+v {xschem version=3.0.0 file_version=1.2 }
+G {}
+K {type=subcircuit
+format="@name @pinlist @symname"
+template="name=XAMP1"}
+V {}
+S {}
+E {}
+L 4 180 -180 180 -80 {}
+L 4 180 -80 280 -130 {}
+L 4 180 -180 280 -130 {}
+L 4 280 -130 300 -130 {}
+L 4 160 -130 180 -130 {}
+L 4 240 -180 240 -150 {}
+L 4 240 -110 240 -80 {}
+L 4 220 -100 220 -80 {}
+B 5 157.5 -132.5 162.5 -127.5 {name=in
+dir=in}
+B 5 237.5 -82.5 242.5 -77.5 {name=gnd
+dir=in}
+B 5 297.5 -132.5 302.5 -127.5 {name=out
+dir=out}
+B 5 237.5 -182.5 242.5 -177.5 {name=vdd
+dir=in}
+B 5 217.5 -82.5 222.5 -77.5 {name=bias
+dir=in}
+T {@name} 260 -180 0 0 0.2 0.2 {}
diff --git a/xschem/lna/lna4stage.sch b/xschem/lna/lna4stage.sch
new file mode 100644
index 0000000..5a19c2b
--- /dev/null
+++ b/xschem/lna/lna4stage.sch
@@ -0,0 +1,115 @@
+v {xschem version=3.0.0 file_version=1.2 }
+G {}
+K {}
+V {}
+S {}
+E {}
+N 280 -160 320 -160 {
+lab=#net1}
+N 460 -160 500 -160 {
+lab=#net2}
+N 220 -110 220 -80 {
+lab=GND}
+N 140 -20 820 -20 {
+lab=GND}
+N 220 -240 220 -210 {
+lab=#net3}
+N 400 -240 400 -210 {
+lab=#net3}
+N 580 -240 580 -210 {
+lab=#net3}
+N 760 -240 760 -210 {
+lab=#net3}
+N 160 -240 840 -240 {
+lab=#net3}
+N 820 -20 840 -20 {
+lab=GND}
+N 140 -240 160 -240 {
+lab=#net3}
+N 100 -160 140 -160 {
+lab=#net4}
+N 820 -160 860 -160 {
+lab=out}
+N 80 -140 100 -160 {
+lab=#net4}
+N 640 -160 680 -160 {
+lab=#net5}
+N 200 -50 200 -20 {
+lab=GND}
+N 220 -80 220 -20 {
+lab=GND}
+N 400 -110 400 -80 {
+lab=GND}
+N 380 -50 380 -20 {
+lab=GND}
+N 400 -80 400 -20 {
+lab=GND}
+N 580 -110 580 -80 {
+lab=GND}
+N 560 -50 560 -20 {
+lab=GND}
+N 580 -80 580 -20 {
+lab=GND}
+N 760 -110 760 -80 {
+lab=GND}
+N 740 -50 740 -20 {
+lab=GND}
+N 760 -80 760 -20 {
+lab=GND}
+C {/foss/designs/caravel_ft8_receiver/xschem/lna/foldedcascode.sym} -20 -30 0 0 {name=XAMP1}
+C {/foss/designs/caravel_ft8_receiver/xschem/lna/foldedcascode.sym} 160 -30 0 0 {name=XAMP2}
+C {/foss/designs/caravel_ft8_receiver/xschem/lna/foldedcascode.sym} 340 -30 0 0 {name=XAMP3}
+C {code.sym} -140 -250 0 0 {name=s1 only_toplevel=false value="
+.lib /foss/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt
+.control
+ ** dc V1 0.769 3.769 0.01
+ ** dc V2 0 3 0.01
+ ** SIN(0.9 0.00001 70000000)
+ tran 0.0000000001 0.0000001
+.endc
+.save all
+"}
+C {code.sym} -280 -130 0 0 {name=sT_MODELS
+only_toplevel=true
+format="tcleval( @value )"
+value="** manual skywater pdks install (with patches applied)
+* .lib \\\\$::SKYWATER_MODELS\\\\/models/sky130.lib.spice tt
+
+** opencircuitdesign pdks install
+.lib /foss/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt
+
+.param mc_mm_switch=0
+.param mc_pr_switch=0
+"
+spice_ignore=false}
+C {opin.sym} 860 -160 0 0 {name=out lab=out}
+C {vsource.sym} 80 -110 0 1 {name=V1 value="SIN(0.8 0.00005 70000000)"}
+C {vsource.sym} 110 -240 1 0 {name=V2 value=1.8}
+C {gnd.sym} 80 -240 1 0 {name=l1 lab=GND}
+C {gnd.sym} 80 -80 0 0 {name=l2 lab=GND}
+C {gnd.sym} 140 -20 0 0 {name=l3 lab=GND}
+C {/foss/designs/caravel_ft8_receiver/xschem/lna/foldedcascode.sym} 520 -30 0 0 {name=XAMP4}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 200 -80 2 0 {name=R1
+W=0.69
+L=0.1
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 380 -80 2 0 {name=R2
+W=0.69
+L=0.1
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 560 -80 2 0 {name=R3
+W=0.69
+L=0.18
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
+C {/foss/pdk/sky130A/libs.tech/xschem/sky130_fd_pr/res_xhigh_po.sym} 740 -80 2 0 {name=R4
+W=0.69
+L=0.18
+model=res_xhigh_po
+spiceprefix=X
+mult=1}
