u2730b ATMEL Corporation, u2730b Datasheet - Page 8

• Manufacturer Part Number: u2730b
• Description: L-band Down-converter Receivers
• Manufacturer: ATMEL Corporation

Equivalent Circuits
U2730B
8 (12)
output
IF
V
Tune
Resonator: Siemens Matsushita ( /4–Resonator)
6.8p
Notice: The VCO needs a DC–path between TANK and VREF-Pin
550MHz
60MHz
Resonator
47k
Preliminary Information
Ceramic Coaxial Resonator 1.6 GHz
B69640–G 1607–B412
10p
10p
100p
TH
V
R
th
Ref2
Figure 4. AGC contol circuit
controlled
1.5p
Figure 5. VCO circuit
Gain–
mixer
BBY51
TANK
REF
controlled
amplifier
Gain–
V
CC
V
Ref1
15002
AGC
15001
Rev. A1, 20-May-99