ampli opamp accordato

stavo guardando

In effetti simulando risulta accordato a 455Khz. La formula penso sia la solita 1/(2pi*sqrt(LC)).

Ma le resistenze come vengono calcolate ? Ho provato a cambiare la frequenza secondo le mie esigenze, trovati i nuovi valori di L e C, ma ovviamente il guadagno non =E8 quello richiesto, n=E8 la forma d'onda (diventa a forma di "pesce")

Di cosa devo tener conto per una frequenza di 165KHz (diciamo di usare

Grazie, ciao

Allego LTSpice: Version 4 SHEET 1 960 680 WIRE -944 48 -944 -16 WIRE -944 224 -944 128 WIRE -848 128 -848 112 WIRE -848 224 -944 224 WIRE -848 224 -848 192 WIRE -768 -16 -944 -16 WIRE -768 16 -768 -16 WIRE -768 112 -848 112 WIRE -768 112 -768 96 WIRE -768 128 -768 112 WIRE -768 224 -848 224 WIRE -768 224 -768 208 WIRE -704 112 -768 112 WIRE -256 64 -256 16 WIRE -256 416 -256 144 WIRE -176 256 -176 208 WIRE -176 416 -256 416 WIRE -176 416 -176 336 WIRE -32 416 -176 416 WIRE 48 16 -256 16 WIRE 48 48 48 16 WIRE 48 416 -32 416 WIRE 48 416 48 384 WIRE 112 16 48 16 WIRE 112 48 112 16 WIRE 192 16 112 16 WIRE 192 48 192 16 WIRE 272 16 192 16 WIRE 272 32 272 16 WIRE 336 208 -176 208 WIRE 336 208 336 160 WIRE 400 16 272 16 WIRE 400 96 400 16 WIRE 560 160 336 160 WIRE 576 -32 576 -96 WIRE 576 48 576 -32 WIRE 576 112 576 48 WIRE 592 48 576 48 WIRE 608 -96 576 -96 WIRE 608 -32 576 -32 WIRE 656 112 576 112 WIRE 656 160 640 160 WIRE 656 160 656 112 WIRE 688 160 656 160 WIRE 720 96 400 96 WIRE 720 144 720 96 WIRE 768 176 752 176 WIRE 768 176 768 128 WIRE 800 -96 672 -96 WIRE 800 -32 688 -32 WIRE 800 -32 800 -96 WIRE 800 48 672 48 WIRE 800 48 800 -32 WIRE 800 128 768 128 WIRE 800 128 800 48 WIRE 800 176 768 176 WIRE 880 176 864 176 FLAG -32 416 0 FLAG -704 112 VMZ FLAG -944 224 0 FLAG -512 0 0 FLAG -512 -80 VMENO FLAG 720 208 VMENO FLAG 688 192 0 SYMBOL voltage -176 240 R0 WINDOW 123 24 160 Left 0 WINDOW 39 24 132 Left 0 SYMATTR Value2 AC .1 SYMATTR SpiceLine Rser=3D50 SYMATTR InstName V1 SYMATTR Value SINE(0 10m 165K) SYMBOL voltage -256 48 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL Opamps\\LT1211 720 112 R0 SYMATTR InstName U1 SYMBOL res -784 0 R0 SYMATTR InstName R6 SYMATTR Value 220K SYMBOL res -784 112 R0 SYMATTR InstName R7 SYMATTR Value 220K SYMBOL cap -864 128 R0 SYMATTR InstName C5 SYMATTR Value 10=B5 SYMBOL voltage -944 32 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value 5 SYMBOL res 656 144 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R8 SYMATTR Value 2.2K SYMBOL res 688 32 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R9 SYMATTR Value 155K SYMBOL voltage -512 -96 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value -5 SYMBOL ind 704 -48 R90 WINDOW 0 5 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName L1 SYMATTR Value 100=B5 SYMBOL cap 672 -112 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value 9n TEXT -520 144 Left 0 !.LIB KSC945.lib TEXT -290 506 Left 0 !;tran 2m TEXT -528 176 Left 0 !.ac oct 20 10 10MEG TEXT -104 112 Left 0 !;op