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CMX991 Datasheet(PDF) 38 Page - CML Microcircuits

Part No. CMX991
Description  Two-mode demodulator
Download  56 Pages
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Maker  CMLMICRO [CML Microcircuits]
Homepage  http://www.cmlmicro.com
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CMX991 Datasheet(HTML) 38 Page - CML Microcircuits

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RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
 2015 CML Microsystems Plc
38
D/991_992/20
Input Condition
Noise Figure /dB
Gain /dB
50R shunt resistor
13
43
matched network
5
61
straight in
8
49
Table 17 Noise Figure and Gain of IF Amp, VGA, I/Q Mixer and Baseband Filters
CH2
S 11
1 U FS
START 10.000 000 MHz
STOP 150.000 000 MHz
Cor
Del
PRm
MARKER 4
150 MHz
1
2
3
4
4_: 43.684
-115.87
9.1573 pF
150.000 000 MHz
1_: 582.5
-1.4823 k
10 MHz
2_: 82.813
-380.78
45 MHz
3_: 50.047
-172.98
100 MHz
Figure 23 IFIP1 Input Impedance at 0dB attenuation
Freq (MHz)
0dB Setting
6dB Setting
12dB Setting
18dB Setting
24dB Setting
10
4.35k
//9.3pF
4.61k
//9.2pF 4.80k//8.2pF 6.63k//8.3pF 4.75k//8.8pF
45
1.836k
//8.9pF
1.97k
//8.4pF
2.3k
//7.9pF 2.21k//8.2pF 1.96k//8.8pF
100
648
//8.5pF
744
//8.0pF
776
//7.6pF
723
//7.8pF
633
//8.3pF
150
351
//8.0pF
402
//7.6pF
390
//7.3pF
365
//7.3pF
326
//7.8pF
Table 18 IFIP1 Port Impedance (Parallel Equivalent Circuit Models)
The gain calculated in the ‘Straight in’ case is based on direct conversion of the signal generator power to
a voltage and calculating the gain based on the output voltage. The output signal is the differential signal at
RXIN / RXIP (or RXQN and RXQP) so if the voltage is measured at a single pin the signal level must be
doubled to get the appropriate differential signal level. Also it should be noted that making a simple
conversion of the power in the ‘Straight in’ case is erroneous as the voltage calculated will be a potential
difference. As the circuit is un-matched an e.m.f. would be more appropriate (i.e. twice the p.d. value).


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