U2730B-N Datasheet, PDF (13/17 Pages) ATMEL Corporation – L-band Down-converter for DAB Receivers

Equivalent Circuits
Figure 6. AGC Control Circuit
Gain-
controlled
mixer
Gain-
controlled
amplifier
U2730B-N
V_Ref1
4719A–DAB–05/03
IF
output
550 MHz
60 MHz
V_Ref2
TH
R_th
Figure 7. VCO Circuit
V_Tune
47k
BBY51
15 p
Resonator
1.8 p
TANK
1p
VREF
100 p
Resonator: Ceramic coaxial resonator
Murata 3 x 3 mm, 1.6 GHz
DRR030 KE1R600TC
AGC
V_CC
13