CMX991 Datasheet, PDF (38/56 Pages) CML Microcircuits – Two-mode demodulator

RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
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
MARKER 4
150 MHz
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
PRm
Cor
Del
1
2
4
3
START 10.000 000 MHz
STOP 150.000 000 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).
 2015 CML Microsystems Plc
38
D/991_992/20