CMX994 Datasheet, PDF (14/61 Pages) CML Microcircuits – Local Oscillator

Direct Conversion Receivers
CMX994/CMX994A/CMX994E
Frequency
(MHz)
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
1050
1100
1150
1200
Impedance
(Ω-/+jΩ)
172.74-j31.22
162.72-j47.25
148.61-j59.99
132.91-j69.33
116.95-j74.15
101.79-j75.64
88.21-j74.62
76.188-j71.96
66.61-j69.13
58.42-j65.09
52.03-j61.31
46.01-j57.03
41.25-j52.94
37.19-j49.13
34.2-j45.37
31.82-j41.75
29.54-j38.33
27.05-j35.15
24.62-j31.62
22.89-j28.17
21.58-j24.89
20.55-j21.44
19.56-j18.01
18.55-j14.59
Parallel Equivalent
Circuit (R // pF)
178.38R//3.23pF
176.44R//2.62pF
172.83R//2.48pF
169.07R//2.46pF
163.96R//2.46pF
158R//2.5pF
151.33R//2.54pF
144.15R//2.61pF
138.36R//2.65pF
130.94R//2.71pF
124.28R//2.74pF
116.7R//2.82pF
109.19R//2.88pF
102.15R//2.94pF
94.39R//2.98pF
86.6R//3.01pF
79.28R//3.06pF
72.73R//3.16pF
65.23R//3.3pF
57.56R//3.4pF
50.29R//3.48pF
42.92R//3.52pF
36.14R//3.53pF
30.03R//3.47pF
Table 9 CMX994A/CMX994E Rx Mixer Input Impedances and Parallel Equivalent Circuit
C1
C3
R1
RXIP
RXIN
LO
RXQP
RXQN
C2
C4
Figure 9 Recommended Receiver Circuit
C1
1.5nF
C2
1.5nF
C3
3.9nF
C4
3.9nF
R1
10kΩ
Table 10 Receiver Components
The bandwidth of the first baseband filters is set by capacitors C1 and C2. Capacitors C3 and C4 together with
the reference resistor R1 set the bandwidth of the second baseband filters. Component selection will vary
depending on the desired filter bandwidths. For further details see sections 6.2.2 and 6.2.3.
 2015 CML Microsystems Plc
Page 14 of 70
D/994_A_E/1