* SPICE netlist
M1 outp N006 inp inp NM l=0.18u w=6u
VDD N001 0 1.8V
IRF+ inp 0 SINE(1m 0.25m 1.1g) AC 1
R1 outp N001 300
VLO+ N006 0 PULSE(0 1.8 0 100p 100p 0.3n 1n)
IRF- N005 0 SINE(1m -0.25m 1.1g) AC 1
M3 outp N007 N005 N005 NM l=0.18u w=6u
M4 outn N007 inp inp NM l=0.18u w=6u
M5 outn N006 N005 N005 NM l=0.18u w=6u
VLO- N007 0 PULSE(1.8 0 0 100p 100p 0.3n 1n)
R2 outn N001 300
E1 out 0 outp outn 1
R3 out N002 50
L1 N003 N002 20.6n
L2 N004 N003 76.9n
C1 N003 0 22.5p
C2 N004 0 30.7p
C3 out_lpf 0 8.2p
L3 out_lpf N004 56.3n
R4 0 out_lpf 50
.op
;ac dec 100 1 10g
.tran 0 100n 0 10p
.options plotwinsize=0

* LTspice schematic (.asc)
Version 4
SHEET 1 1232 944
WIRE 424 -472 -536 -472
WIRE 488 -472 424 -472
WIRE -360 -424 -472 -424
WIRE -216 -424 -280 -424
WIRE -152 -424 -216 -424
WIRE -40 -424 -72 -424
WIRE 24 -424 -40 -424
WIRE 136 -424 104 -424
WIRE 264 -424 136 -424
WIRE -216 -408 -216 -424
WIRE -40 -408 -40 -424
WIRE 136 -408 136 -424
WIRE 264 -408 264 -424
WIRE -536 -376 -536 -472
WIRE 424 -360 424 -472
WIRE -216 -328 -216 -344
WIRE -40 -328 -40 -344
WIRE -40 -328 -216 -328
WIRE 136 -328 136 -344
WIRE 136 -328 -40 -328
WIRE 264 -328 136 -328
WIRE -472 -296 -472 -344
WIRE -424 -296 -472 -296
WIRE -376 -296 -424 -296
WIRE -216 -296 -296 -296
WIRE 264 -296 264 -328
WIRE -216 -264 -216 -296
WIRE 424 -248 424 -280
WIRE -536 -216 -536 -296
WIRE -360 -216 -360 -248
WIRE -360 -216 -536 -216
WIRE 8 -216 -360 -216
WIRE -312 -184 -312 -248
WIRE -152 -184 -312 -184
WIRE 424 -184 424 -248
WIRE 424 -184 -152 -184
WIRE -536 -168 -536 -216
WIRE -536 -136 -536 -168
WIRE -152 -136 -152 -184
WIRE 8 -136 8 -216
WIRE 424 -136 424 -184
WIRE -520 -88 -536 -88
WIRE -152 -88 -168 -88
WIRE 24 -88 8 -88
WIRE 424 -88 408 -88
WIRE -584 -56 -616 -56
WIRE -72 -56 -104 -56
WIRE -40 -56 -72 -56
WIRE 616 -56 472 -56
WIRE 8 -8 8 -40
WIRE 24 -8 24 -88
WIRE 24 -8 8 -8
WIRE 216 -8 24 -8
WIRE 408 -8 408 -88
WIRE 408 -8 216 -8
WIRE 424 -8 424 -40
WIRE 424 -8 408 -8
WIRE -536 40 -536 -40
WIRE -520 40 -520 -88
WIRE -520 40 -536 40
WIRE -344 40 -520 40
WIRE -168 40 -168 -88
WIRE -168 40 -344 40
WIRE -152 40 -152 -40
WIRE -152 40 -168 40
WIRE 616 40 616 -56
WIRE 616 40 536 40
WIRE -616 56 -616 -56
WIRE 536 56 536 40
WIRE 536 56 -616 56
WIRE 216 104 216 -8
WIRE 616 104 616 40
WIRE -72 216 -72 -56
WIRE 488 232 488 -472
WIRE -488 248 -600 248
WIRE -344 248 -344 40
WIRE -344 248 -488 248
WIRE -600 296 -600 248
WIRE -600 440 -600 376
WIRE -248 440 -600 440
WIRE -72 440 -72 296
WIRE -72 440 -248 440
WIRE 216 440 216 184
WIRE 216 440 -72 440
WIRE 488 440 488 312
WIRE 488 440 216 440
WIRE 616 440 616 184
WIRE 616 440 488 440
WIRE -248 472 -248 440
FLAG -248 472 0
FLAG -488 248 inp
FLAG -536 -168 outp
FLAG 424 -248 outn
FLAG -216 -264 0
FLAG -424 -296 out
FLAG 264 -296 0
FLAG 264 -424 out_lpf
SYMBOL nmos4 -584 -136 R0
SYMATTR Value NM
SYMATTR Value2 l=0.18u w=6u
SYMATTR InstName M1
SYMBOL voltage 488 216 R0
SYMATTR InstName VDD
SYMATTR Value 1.8V
SYMBOL current -600 296 R0
SYMATTR Value2 AC 1
SYMATTR InstName RF+
SYMATTR Value SINE(1m 0.25m 1.1g)
SYMBOL res -520 -280 R180
SYMATTR InstName R1
SYMATTR Value 300
SYMBOL voltage 616 88 R0
SYMATTR InstName LO+
SYMATTR Value PULSE(0 1.8 0 100p 100p 0.3n 1n)
SYMBOL current 216 104 R0
SYMATTR Value2 AC 1
SYMATTR InstName RF-
SYMATTR Value SINE(1m -0.25m 1.1g)
SYMBOL nmos4 -40 -136 R0
SYMATTR Value NM
SYMATTR Value2 l=0.18u w=6u
SYMATTR InstName M3
SYMBOL nmos4 -104 -136 M0
SYMATTR Value NM
SYMATTR Value2 l=0.18u w=6u
SYMATTR InstName M4
SYMBOL nmos4 472 -136 M0
SYMATTR Value NM
SYMATTR Value2 l=0.18u w=6u
SYMATTR InstName M5
SYMBOL voltage -72 200 R0
SYMATTR InstName LO-
SYMATTR Value PULSE(1.8 0 0 100p 100p 0.3n 1n)
SYMBOL res 440 -264 R180
SYMATTR InstName R2
SYMATTR Value 300
SYMBOL e -392 -296 R270
SYMATTR InstName E1
SYMATTR Value 1
SYMBOL res -488 -328 M180
SYMATTR InstName R3
SYMATTR Value 50
SYMBOL ind -264 -440 R90
SYMATTR InstName L1
SYMATTR Value 20.6n
SYMBOL ind -56 -440 R90
SYMATTR InstName L2
SYMATTR Value 76.9n
SYMBOL cap -232 -408 R0
SYMATTR InstName C1
SYMATTR Value 22.5p
SYMBOL cap -56 -408 R0
SYMATTR InstName C2
SYMATTR Value 30.7p
SYMBOL cap 120 -408 R0
SYMATTR InstName C3
SYMATTR Value 8.2p
SYMBOL ind 120 -440 R90
SYMATTR InstName L3
SYMATTR Value 56.3n
SYMBOL res 248 -312 M180
SYMATTR InstName R4
SYMATTR Value 50