* SPICE netlist
R1 N005 N001 10k
C1 N005 N001 150p
XU1 0 N001 V+ V- N005 OP177A ;pnba In+)In-)V+)V-)OUT
XU2 0 N002 V+ V- N006 OP177A ;pnba In+)In-)V+)V-)OUT
C2 0 V- 1n
C3 0 V- 1n
R2 N006 N002 10k
C4 N006 N002 150p
R3 N002 N005 1k
I1 0 N001 0 AC 2m
R4 N001 0 750Meg
V1 V+ V- 15
XU3 0 N003 V+ V- N007 OP177A ;pnba In+)In-)V+)V-)OUT
C5 0 V- 1n
R5 N007 N003 10k
C6 N007 N003 150p
R6 N003 N006 1k
XU4 0 N004 V+ V- A-B OP177A ;pnba In+)In-)V+)V-)OUT
C7 0 V- 1n
R7 A-B N004 10k
C8 A-B N004 150p
R8 N004 N007 1k
.ac lin 30000 10 100000

* LTspice schematic (.asc)
Version 4
SHEET 1 1440 400
WIRE -352 -184 -368 -184
WIRE -80 -184 -96 -184
WIRE 240 -168 224 -168
WIRE 544 -152 528 -152
WIRE -368 -88 -368 -184
WIRE -288 -88 -288 -184
WIRE -96 -88 -96 -184
WIRE -16 -88 -16 -184
WIRE 224 -72 224 -168
WIRE 304 -72 304 -168
WIRE 528 -56 528 -152
WIRE 608 -56 608 -152
WIRE -720 -40 -720 -88
WIRE -576 8 -576 -104
WIRE -496 8 -496 -104
WIRE -368 8 -368 -88
WIRE -368 8 -496 8
WIRE -352 8 -368 8
WIRE -288 24 -288 -88
WIRE -224 24 -288 24
WIRE -96 24 -96 -88
WIRE -96 24 -144 24
WIRE -80 24 -96 24
WIRE -384 40 -448 40
WIRE -352 40 -384 40
WIRE -16 40 -16 -88
WIRE 96 40 -16 40
WIRE 224 40 224 -72
WIRE 224 40 176 40
WIRE 240 40 224 40
WIRE -576 56 -576 8
WIRE -112 56 -160 56
WIRE -80 56 -112 56
WIRE 304 56 304 -72
WIRE 400 56 304 56
WIRE 528 56 528 -56
WIRE 528 56 480 56
WIRE 544 56 528 56
WIRE 208 72 160 72
WIRE 240 72 208 72
WIRE 608 72 608 -56
WIRE 720 72 608 72
WIRE -448 88 -448 40
WIRE -384 88 -384 40
WIRE 512 88 464 88
WIRE 544 88 512 88
WIRE -720 104 -720 40
WIRE -160 104 -160 56
WIRE -112 104 -112 56
WIRE 160 120 160 72
WIRE 208 120 208 72
WIRE 464 136 464 88
WIRE 512 136 512 88
FLAG -160 104 0
FLAG -48 8 V+
FLAG -320 -8 V+
FLAG -320 56 V-
FLAG -384 152 V-
FLAG -112 168 V-
FLAG -48 72 V-
FLAG -448 88 0
FLAG -576 56 0
FLAG -720 -88 V+
FLAG -720 104 V-
FLAG 160 120 0
FLAG 272 24 V+
FLAG 208 184 V-
FLAG 272 88 V-
FLAG 464 136 0
FLAG 576 40 V+
FLAG 512 200 V-
FLAG 576 104 V-
FLAG 720 72 A-B
SYMBOL res -272 -104 R90
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap -288 -200 R90
SYMATTR InstName C1
SYMATTR Value 150p
SYMBOL OpAmps\\OP177A -320 -40 R0
SYMATTR InstName U1
SYMBOL OpAmps\\OP177A -48 -24 R0
SYMATTR InstName U2
SYMBOL cap -400 88 R0
SYMATTR InstName C2
SYMATTR Value 1n
SYMBOL cap -128 104 R0
SYMATTR InstName C3
SYMATTR Value 1n
SYMBOL res 0 -104 R90
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL cap -16 -200 R90
SYMATTR InstName C4
SYMATTR Value 150p
SYMBOL res -128 8 R90
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL current -576 8 R270
SYMATTR InstName I1
SYMATTR Value 0
SYMATTR Value2 AC 2m
SYMBOL res -480 -120 R90
SYMATTR InstName R4
SYMATTR Value 750Meg
SYMBOL voltage -720 -56 R0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL OpAmps\\OP177A 272 -8 R0
SYMATTR InstName U3
SYMBOL cap 192 120 R0
SYMATTR InstName C5
SYMATTR Value 1n
SYMBOL res 320 -88 R90
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL cap 304 -184 R90
SYMATTR InstName C6
SYMATTR Value 150p
SYMBOL res 192 24 R90
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL OpAmps\\OP177A 576 8 R0
SYMATTR InstName U4
SYMBOL cap 496 136 R0
SYMATTR InstName C7
SYMATTR Value 1n
SYMBOL res 624 -72 R90
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL cap 608 -168 R90
SYMATTR InstName C8
SYMATTR Value 150p
SYMBOL res 496 40 R90
SYMATTR InstName R8
SYMATTR Value 1k