LTC1060_09 Datasheet, PDF (14/20 Pages) Linear Technology – Universal Dual Filter Building Block

LTC1060
ODES OF OPERATIO
R3
R2
R1 = R2
V_IN
4–
(17)
+
3
AP2
(18)
5
S1A
(16)
+
–
Σ
∫
–
2
BP
(19)
1
LP
(20)
∫
S_A/B
6 15
1/2 LTC1060
TLC1060 • MOO10
V⁺
( ) ^f0
= ^fCLK ;
100(50)
Q
=
R3;
R2
H_OAP
=
–
R2;
R1
H_OLP
=
–2
H_OBP
=
–
2
R3
R2
Figure 13. Mode 4: 2nd Order Filter Providing Allpass,
Bandpass, Lowpass
R4
R3
R2
R1
V_IN
4–
(17)
+
3
CZ
(18)
5
S1A
(16)
+
–
Σ
∫
–
2
BP
(19)
1
LP
(20)
∫
S_A/B
6 15
1/2 LTC1060
TLC1060 • MOO12
V⁺
f₀
=
f_CLK
100(50)
1
+
R2
R4
;
f_z
=
f_CLK
100(50)
1 – ^R1 ; Q = ^R3
R4 R2
1 + ^R2
R4
Q₂
=
R3
R1
( ¹
–
R1
R4
;
H_OZ
=
(f
0)
=
(R4/R1) –1
(R4/R2) + 1
;
H_OZ
f
)fCLK = R2 ;
2 R1
( ) ^HOBP
=
R3
R2
1 + ^R2
R1
;
H_OLP
=
1
1
+
+
(R2/R1)
(R2/R4)
Figure 15. Mode 5: 2nd Order Filter Providing Numerator
Complex Zeros, Bandpass, Lowpass
R4
R3
R2
R1
V_IN
4–
(17)
+
S_A/B
6 15
V^–
3
HP
(18)
5
S1A
(16)
2
BP
(19)
1
LP
(20)
+–
Σ∫
∫
–
R5
1/2 LTC1060
R
2R
–
EXTERNAL
OP AMP
+
f₀
= ^fCLK
100(50)
R2 _{; Q =} R3
R4 R2
R2
R4
;
H_0AP
=
R5;
2R
H_0HP
=
–
R2;
R1
H_0BP
=
–
R3
R1
;
H_0LP = –
R4
R1
TLC1060 • MOO11
Figure 14. Mode 4a: 2nd Order Filter Providing Highpass,
Bandpass, Lowpass, Allpass
R3
R2
R1
V_IN
4–
(17)
+
3
N
(18)
5
S1A
(16)
2
BP
(19)
1
LP
(20)
+–
Σ∫
∫
–
S_A/B
6 15
1/2 LTC1060
TLC1060 • MOO13
V^–
f_C
=
f_CLK R2
100(50) R3
;
H_0LP
=
–
R3/R1
;
H_0HP
=
–
R2/R1
Figure 16. Mode 6a: 1st Order Filter Providing Highpass,
Lowpass
1060fb
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