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| U2730B-N Datasheet, PDF (15/17 Pages) ATMEL Corporation – L-band Down-converter for DAB Receivers | |||
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U2730B-N
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 a LO buffer.
Figure 9. Application Circuit for External LO Signal
ext. LO signal
(50 W signal gen.)
PLO = -10 dBm
50
100 p
TANK
470 nH
VREF
1n
Figure 10. Reference Oscillator Operation
68 pF
OSCB
Reference devider
Quartz crystal
33 pF
OSCE
18 pF
Figure 11. Rerference Oscillator Overdriven
Reference signal
OSCB
L1
C1
OSCE
Reference devider
15
4719AâDABâ05/03
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