Direct Conversion Receivers
CMX994/CMX994A/CMX994E
S11
Equivalent Parallel
S22
Equivalent Parallel
Freq (MHz)
Impedance
(Ω-/+jΩ)
355 – j291
210 – j267
128 – j222
92 – j186
70 – j157
56 – j134
45 – j117
38 – j103
34.1 – j91
30.5 – j82
26.4 – j73
24.0 – j66
21.7 – j59
19.9 – j53
18.7 – j47.7
17.5 – j42.8
16.5 – j38.3
15.4 – j34.4
14.2 – j30.5
13.4 – j26.7
Impedance
(Ω-/+jΩ)
Circuit (R//C)
592.6R // 4.4pf
549.1R // 3.7pF
510.6R // 3.6pF
469.9R // 3.4pF
422.4R // 3.4pF
376.9R // 3.4pF
345.3R // 3.4pF
313.1R // 3.4pF
279.2R // 3.4pF
253R // 3.4pF
228.9R // 3.5pF
203.6R // 3.6pF
183.3R // 3.7pF
162.3R // 3.8pF
140.8R // 3.9pF
122.2R // 4pF
Circuit (R//C)
106.6R // 2.1pF
106R // 1.4pF
105.7R // 1.2pF
105.3R // 1.2pF
104.4R // 1.1pF
103R // 1.1pF
101.5R // 1.1pF
99.9R // 1.1pF
98.3R // 1.1pF
96.1R // 1.1pF
93.7R // 1.1pF
91.3R // 1.1pF
88.6R // 1.1pF
85.6R // 1.1pF
82.6R // 1.1pF
79.7R // 1.1pF
76.7R // 1.2pF
73R // 1.2pF
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
106 – j7.35
105 – j9.5
104 – j2.8
103 – j15.7
101 – j18.6
98 – j21.4
96 – j23.9
93 – j26.2
90 – j27.8
87 – j28.9
83 – j29.7
80 – j30.5
76 – j30.7
73 – j30.5
69 – j30.5
66 – j30.0
63 – j29.5
60 – j28.4
57 – j27.1
54 – j26.0
105.5R // 4.1pF
92.2R // 4.3pF
79.6R // 4.5pF
66.6R // 4.8pF
69.5R // 1.2pF
66.3R // 1.2pF
Table 4 LNA S11 and S22 Impedances and Parallel Equivalent Circuit in 100Ω Mode
C3
L3
C2
L1
C1
RF Input
LNA
LNA IN
L2
LO
Figure 7 Recommended LNA Configuration and Inter-stage Match
C1
C2
C3
1nF
33pF // 10nF
18pF
L1
L2
L3
150nH
2.7pF (capacitor)
150nH
Table 5 150MHz LNA and Inter-stage Components (100Ω output mode)
C1
C2
C3
1nF
33pF // 10nF
10pF
L1
L2
L3
39nH
82nH
27nH
Table 6 450MHz LNA and Inter-stage Components (100Ω output mode)
2015 CML Microsystems Plc
D/994_A_E/1
Page 12 of 70
CMLMICRO [ CML MICROCIRCUITS ]
