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Adjustment Free Hence Saves Time
300-MHz
Quadrature
Modulator
U2793B
Electrostatic sensitive device.
Observe precautions for handling.
Description
The IC U2793B is a 300-MHz quadrature modulator that uses Atmel鈥榮 advanced UHF
process. It features low current consumption, single-ended RF ports and adjustment-
free application, which makes the device suitable for all digital radio systems, e.g.,
GSM, PCN, JDC and WLAN. As an option, output level and spurious products are
adjustable at pins 19 and 20. In conjunction with Atmel鈥檚 U2795B mixer, an up-con-
verter up to 2 GHz can be realized.
Figure 1.
Block Diagram
S
PD
BB
Ai
BB
Ai
10
9
8
PU
1
LO
i
LO
i
14
Duty cycle
15 regenerator
Frequency
doubler
0擄
90擄
90擄 control
loop
危
Power 6,7 V
S
up
V
Ref
13
19
LP2
LP1
20
RF
o
4
BB
Bi
BB
Bi
11
12
3,16,17,18
GND
2
5
AC
GND
AC
GND
Rev. 4651C鈥揅ELL鈥?7/04