CMX971 Datasheet, PDF (20/25 Pages) CML Microcircuits – Small 16-lead VQFN Package

Quadrature Modulator
CMX971
8.2.4 Harmonics
The typical levels of modulator harmonics are summarised in Table 6 for an I/Q modulator output level of
circa 0dBm; the LO level was -10dBm.
Variation of the LO level +/-10dB does not change the CMX971 modulator harmonic levels significantly.
Whether the divide-by-2 or divide-by-4 mode is used also does not materially effect the level of the
harmonics.
Harmonic
2^nd
3^rd
4^th
5^th
6^th
7^th
8^th
9^th
10^th
100MHz
/ dBc
-37
-10
-40
-15
-41
-19
-42
-23
-45
400MHz
/ dBc
-37
-15
-36
-27
-48
-40
-55
-51
-66
500MHz
/ dBc
-36
-17
-39
-33
-53
-51
-61
-64
-74
1GHz
/ dBc
-34
-28
-47
-46
-57
-59
-68
Table 6 Typical Modulator Harmonic Levels for Given Output Frequency
 2015 CML Microsystems Plc
20
D/971/4