STW81101_07 Datasheet, PDF (40/48 Pages) STMicroelectronics – Multi-band RF frequency synthesizer with integrated VCOs

Application information
STW81101
Figure 30. Evaluation board (EVB4G) matching network (MATCH_EVB4G.dsn)
Vcc
50 ohm
RF_OUTP
RF_OUTN
50 ohm
5.5nH
12pF
2:1
12pF
5.5nH
12pF
4.7pF
1pF
1pF 1.2pF
1.2pF 50 ohm
Vcc
For differential to single conversion, the 50 to 100Ω Johanson balun is recommended
(3700BL15B100).
8.2
Divided by 2 output
If your application does not require a balanced to unbalanced conversion, the output
matching reduces to the simple circuit shown below (Figure 31), which illustrates a
differential to single-ended output network in the 1.65 - 2.2GHz range
(MATCH_LC_LUMP_2G_DIFF.dsn). You can easily use this solution to provide one single-
ended output that terminates the other output at 50Ω with a 3dB power loss.
Figure 31. Differential/single-ended output network
(MATCH_LC_LUMP_2G_DIFF.dsn)
Vcc
50 ohm
RF_OUTP
RF_OUTN
50 ohm
22nH
10pF
10pF
22nH
50 ohm
50 ohm
Vcc
40/48