ML2111 Datasheet, PDF (20/26 Pages) Micro Linear Corporation – Universal Dual High Frequency Filter

ML2111
R4
R3
R2
R1
V_IN
4 (17) ₊
CZ
S1_A
3 (18) 5 (16)
+_Σ
BP
2 (19)
LP
1 (20)
S_A/B
6
15
V+
f₀
=
f_CLK
100(50)
™
1+
R2
R4
;
f_Z
=
f_CLK
100(50)
™
1- ^R1 ;
R4
Q = ^R3 ™
R2
1+
R2
R4
;
Q
Z
=
R3 _™
R1
1- ^R1 ;
R4
  _{1 6 00} ⁵⁵ _HOBP
=
R3 _™
R2
1+ ^R2
R1
;H_OZ
f“0
=
R4 / R1 - 1
;
R4 / R2 + 1
  ₀₀ ⁵⁵ _HOZ
f “ ^fCLK
2
=
R2
R1
;H_OLP
=
1+
1+
R2 / R1
R2 / R4
Figure 27. Mode 5: 2nd Order Filter Providing
Numerator Complex Zeroes, Bandpass, Lowpass — ½
ML2111
R3
R2
R1
V_IN
4 (17) ₊
HP
S1_A
3 (18) 5 (16)
+_Σ
S_A/B
6
15
V-
LP
2 (19)
1 (20)
f_C
=
f_CLK
100(50)
™
R2
R3
;H_OLP
=
-
R3
R1
;H_OHP
=
- ^R2
R1
Figure 28. Mode 6a: 1st Order Filter Providing
Highpass, Lowpass — ½ ML2111
R3
R2
4 (17) ₊
V_IN
LP1
S1_A
3 (18) 5 (16)
+_Σ
LP2
2 (19)
1 (20)
S_A/B
6
15
V-
f_C
=
f_CLK
100(50)
™
R2
R3
;H_OLP1
= 1;H_OLP2
=
-
R3
R2
Figure 29. Mode 6b: 1st Order Filter Providing Lowpass
— ½ ML2111
20
R3
R2 = R1
R1 = R2
V_IN
4 (17) ₊
AP
S1_A
3 (18) 5 (16)
+_Σ
LP
2 (19)
1 (20)
S_A/B
6
15
V-
f_P
=
f_Z
=
f_CLK
100(50)
™
R2
R3
;H_OLP
=
2™
- ^R2
R3
|GAIN AT OUTPUT| = 1 FOR 0 ˆ f ˆ ^fCLK
2
Figure 30. Mode 7: 1st Order Filter Providing Allpass,
Lowpass — ½ ML2111