CMX994 Datasheet, PDF (13/61 Pages) CML Microcircuits – Local Oscillator

Direct Conversion Receivers
CMX994/CMX994A/CMX994E
5.2.2
C1
100pF
L1
C2
33pF //10nF
L2
C3
4.7pF
L3
12nH
8.7nH
5.6nH
Table 7 900MHz LNA and Inter-stage Components (50Ω output mode)
Mixers and Baseband Section
Figure 8 is a plot of the typical Rx Mixer input impedance; Table 8 gives the measured impedances and the
equivalent parallel circuit at some particular frequencies.
Figure 8 Rx Mixer Input Impedance
Frequency
(MHz)
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
Impedance
(Ω-/+jΩ)
180 – j35.2
168 – j49.1
153 – j64
138 – j73
124 – j77
108 – j79
96 – j79
85 – j77
76 – j74
69 – j70
61 – j66
55 – j62
50 – j58
46.1 – j53
42.7 – j48.9
39.8 – j45.3
37.2 – j41.6
34.8 – j38.1
32.3 – j34.9
30.3 – j31.6
Parallel Equivalent
Circuit (R // pF)
186.6R // 3.34pF
182.4R // 2.6pF
180.1R/ / 2.5pF
176.4R // 2.4pF
171.4R // 2.3pF
165.8R // 2.3pF
160R // 2.3pF
154.1R // 2.3pF
147.3R // 2.3pF
139.8R // 2.3pF
131.5R // 2.4pF
124R // 2.4pF
116R // 2.4pF
107.1R // 2.4pF
98.9R // 2.5pF
91.4R // 2.5pF
83.7R // 2.5pF
76.6R // 2.5pF
70.2R // 2.6pF
63.2R // 2.6pF
Table 8 CMX994 Rx Mixer Input Impedances and Parallel Equivalent Circuit
 2015 CML Microsystems Plc
Page 13 of 70
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