* SPICE netlist
R1 N001 N004 39.2k
R2 Vout_charge N001 240Meg
C1 Vout_charge N001 68p
V1 3V3 0 3.3
R3 N009 3V3 10k
R4 0 N009 10k
XU1 Vcc/2 N001 3V3 0 Vout_charge TLV6742 ;pnba In+)In-)V+)V-)OUT
XU2 N009 Vcc/2 3V3 0 Vcc/2 TLV6742 ;pnba In+)In-)V+)V-)OUT
V2 S+ 0 SINE(0 1.3m 1k 1m 0 .1m 1)
C2 N004 S+ 390p
R5 N002 N006 7.5k
C3 N002 0 1n
R6 N007 N002 7.5k
C4 N008 N006 1n
C5 N007 N008 1n
R7 N008 0 1.8k
XU3 N007 N003 3V3 0 N005 TLV6742 ;pnba In+)In-)V+)V-)OUT
R8 N003 Vcc/2 110
R9 N005 N003 11k
C6 Vout N005 100n
R10 Vout 0 158k
C7 S+ 0 1n
R11 S+ 0 1k
.tran 20m

* LTspice schematic (.asc)
Version 4
SHEET 1 2016 656
WIRE -144 -312 -208 -312
WIRE -32 -312 -80 -312
WIRE -208 -216 -208 -312
WIRE -144 -216 -208 -216
WIRE -32 -216 -32 -312
WIRE -32 -216 -64 -216
WIRE 384 -200 368 -200
WIRE 400 -200 384 -200
WIRE 384 -184 384 -200
WIRE 528 -184 528 -264
WIRE 608 -184 528 -184
WIRE 720 -184 688 -184
WIRE 864 -184 720 -184
WIRE -608 -136 -768 -136
WIRE 720 -120 720 -184
WIRE 752 -120 720 -120
WIRE -336 -104 -352 -104
WIRE -208 -104 -208 -216
WIRE -208 -104 -256 -104
WIRE -144 -104 -208 -104
WIRE 944 -104 944 -184
WIRE 944 -104 816 -104
WIRE -32 -88 -32 -216
WIRE -32 -88 -80 -88
WIRE 48 -88 -32 -88
WIRE 288 -88 288 -200
WIRE 288 -88 256 -88
WIRE 480 -88 480 -200
WIRE 752 -88 480 -88
WIRE -144 -72 -208 -72
WIRE -768 -56 -768 -136
WIRE -736 -56 -768 -56
WIRE -608 -40 -608 -136
WIRE -608 -40 -672 -40
WIRE -560 -40 -608 -40
WIRE 288 -40 288 -88
WIRE 304 -40 288 -40
WIRE 384 -40 368 -40
WIRE 400 -40 384 -40
WIRE 480 -40 480 -88
WIRE 480 -40 464 -40
WIRE -736 -24 -816 -24
WIRE -208 -24 -208 -72
WIRE 384 -24 384 -40
WIRE -816 72 -816 -24
WIRE -816 72 -848 72
WIRE -784 72 -816 72
WIRE -672 72 -704 72
WIRE -672 104 -672 72
WIRE -624 232 -688 232
WIRE -688 248 -688 232
WIRE -688 248 -784 248
FLAG -1008 -184 0
FLAG -1008 -264 3V3
FLAG -112 -120 3V3
FLAG -112 -56 0
FLAG -928 72 3V3
FLAG -672 104 0
FLAG 48 -88 Vout_charge
FLAG -704 -72 3V3
FLAG -704 -8 0
FLAG -560 -40 Vcc/2
FLAG -208 -24 Vcc/2
FLAG -784 248 S+
FLAG -416 -104 S+
FLAG 384 -120 0
FLAG 784 -72 0
FLAG 784 -136 3V3
FLAG 528 -264 Vcc/2
FLAG 1008 -24 0
FLAG 1008 -104 Vout
FLAG 384 56 0
FLAG -784 328 0
FLAG -688 312 0
FLAG -624 312 0
SYMBOL res -240 -120 R90
SYMATTR InstName R1
SYMATTR Value 39.2k
SYMBOL res -48 -232 R90
SYMATTR InstName R2
SYMATTR Value 240Meg
SYMBOL cap -80 -328 R90
SYMATTR InstName C1
SYMATTR Value 68p
SYMBOL voltage -1008 -280 R0
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL res -832 56 R90
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res -688 56 R90
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL OpAmps\\opamp2 -112 -152 R0
SYMATTR InstName U1
SYMATTR Value TLV6742
SYMBOL OpAmps\\opamp2 -704 -104 R0
SYMATTR InstName U2
SYMATTR Value TLV6742
SYMBOL voltage -784 232 R0
SYMATTR InstName V2
SYMATTR Value SINE(0 1.3m 1k 1m 0 .1m 1)
SYMBOL cap -352 -120 R90
SYMATTR InstName C2
SYMATTR Value 390p
SYMBOL res 384 -216 R90
SYMATTR InstName R5
SYMATTR Value 7.5k
SYMBOL cap 368 -184 R0
SYMATTR InstName C3
SYMATTR Value 1n
SYMBOL res 496 -216 R90
SYMATTR InstName R6
SYMATTR Value 7.5k
SYMBOL cap 368 -56 R90
SYMATTR InstName C4
SYMATTR Value 1n
SYMBOL cap 464 -56 R90
SYMATTR InstName C5
SYMATTR Value 1n
SYMBOL res 368 -40 R0
SYMATTR InstName R7
SYMATTR Value 1.8k
SYMBOL OpAmps\\opamp2 784 -168 R0
SYMATTR InstName U3
SYMATTR Value TLV6742
SYMBOL res 704 -200 R90
SYMATTR InstName R8
SYMATTR Value 110
SYMBOL res 960 -200 R90
SYMATTR InstName R9
SYMATTR Value 11k
SYMBOL cap 1008 -120 R90
SYMATTR InstName C6
SYMATTR Value 100n
SYMBOL res 992 -120 R0
SYMATTR InstName R10
SYMATTR Value 158k
SYMBOL cap -704 248 R0
SYMATTR InstName C7
SYMATTR Value 1n
SYMBOL res -640 216 R0
SYMATTR InstName R11
SYMATTR Value 1k