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U2793B_06

Description
300-mhz quadrature modulator
File Size264KB,13 Pages
ManufacturerAtmel (Microchip)
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U2793B_06 Overview

300-mhz quadrature modulator

Features
Supply Voltage: 5V
Low Power Consumption: 15 mA/5V
Output Level and Spurious Products Adjustable (Optional)
Excellent Sideband Suppression by Means of Duty Cycle Regeneration
of the LO Input Signal
Phase-control Loop for Precise 90° Phase Shifting
Power-down Mode
Low LO Input Level: -15 dBm
50-Ω Single-ended LO and RF Port
LO Frequency Range of 30 MHz to 300 MHz
Benefits
Low Current Consumption
Few External Components Result in Cost and Board Space Saving
Adjustment Free Hence Saves Time
300-MHz
Quadrature
Modulator
U2793B
Electrostatic sensitive device.
Observe precautions for handling.
1. Description
The IC U2793B is a 300-MHz quadrature modulator that uses Atmel
®
’s advanced
UHF process. It features low current consumption, single-ended RF ports and adjust-
ment-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’s U2795B mixer, an
up-converter up to 2 GHz can be realized.
Figure 1-1.
Block Diagram
S
PD
BB
Ai
BB
Ai
10
9
8
PU
1
LO
i
LO
i
14
Duty cycle
15 regenerator
Frequency
doubler
90°
90° control
loop
Σ
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
4651E–CELL–07/06

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