U2730B-B Datasheet, PDF (9/12 Pages) TEMIC Semiconductors – L-Band Down-Converter for DAB Receivers

U2730B-B
Application Circuit for External LO Signal
With an external LO signal it is possible to overdrive the VCO. In this case, the internal VCO acts as an LO buffer.
ext. LO signal
(50Ω signal gen.)
P_LO = –10dBm
50
100p
TANK
470nH
REF
1n
15003
Figure 6. Application circuit for external LO signal
Phase-Noise Performance
Operating conditions
V_CC = 8.5 V, T_amb = 25°C, application circuit see figure 3, I_PD = 200 µA, f_REF = 17.92 MHz / –10 dBm
10.00 dB / DIV
< –75 dBc/Hz
CENTER 1261.568 MHz
RB 100 Hz
VB 100 Hz
Figure 7. Phase noise
SPAN 50.00 kHz
Rev. A1, 22-Jul-98
9 (12)
Preliminary Information