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CMX991 Datasheet(PDF) 37 Page - CML Microcircuits

Part No. CMX991
Description  Two-mode demodulator
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Maker  CMLMICRO [CML Microcircuits]
Homepage  http://www.cmlmicro.com
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CMX991 Datasheet(HTML) 37 Page - CML Microcircuits

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RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
 2015 CML Microsystems Plc
37
D/991_992/20
CH1
S 22
1 U FS
START 10.000 000 MHz
STOP 150.000 000 MHz
1
2
3
4
2_: 412.42
-235.34
15.028 pF
45.000 000 MHz
1_: 539.72
-96.312
10 MHz
3_: 220.22
-251.82
100 MHz
4_: 131.29
-210.62
150 MHz
Figure 22 MIXOUT1 Port Impedance (unmatched)
Frequency / MHz
Series Impedance /
Parallel Equivalent
10
540
– j 96
557
 // 5.1pF
45
412 - j 235
547
 // 3.7pF
100
220
– j 252
508
 // 3.6pF
150
131
– j 211
469
 // 3.6pF
Table 16 MIXOUT Equivalent Impedances
7.7
IF Input Matching
The configuration of the IF input has a significant effect on the measured performance. This is
demonstrated in Table 17, where the receiver is measured with a 50 ohm source and three different input
conditions. The typical input impedance of the IFIP1 or IFIP2 port is shown in Figure 23, the impedance
does not change much with attenuation setting (Table 18). A matched network provides the best noise
figure and maximum gain, however intermodulation will be degraded in this condition due to the larger
signal levels in
dicated by the extra gain. The ‘Straight in’ condition means that the 50 ohm signal source
was connected directly to either IFIP1 or IFIP2 input via a dc blocking capacitor.


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