CMX972 Datasheet, PDF (30/41 Pages) CML Microcircuits – Small 32-lead VQFN Package

Quadrature Demodulator with IF PLL/VCO
58
57.5
57
56.5
56
55.5
55
-55
-35
-15
5
25
45
65
85
Temperature / deg. C
CMX972
20MHz
100MHz
250MHz
Figure 15 Demodulator Gain Variation With Temperature
59
58
57
56
55
54
53
52
51
50
49
50
RT
-20degs
-40degs
+55degs
+85degs
100
150
200
250
300
Freqency / MHz
Figure 16 Variation in Gain with Temperature (COR = ‘0’ $1D = 0x00)
7.4 Effect of Gain Control on Receiver Performance
The CMX972 has two independent gain control elements: VGA is gain control applied in the I/Q sections
and VGB is gain control in the RF/IF sections. Further details can be found in section 5.1. The gain can be
controlled in 6dB steps via the Rx Control Register (see section 6.3).
 2015 CML Microsystems Plc
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D/972/2