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LT5503EFE-PBF

Description
1.2GHz to 2.7GHz Direct IQ Modulator and Mixer
File Size214KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT5503EFE-PBF Overview

1.2GHz to 2.7GHz Direct IQ Modulator and Mixer

LT5503
1.2GHz to 2.7GHz Direct
IQ Modulator and Mixer
FEATURES
DESCRIPTIO
Single 1.8V to 5.25V Supply
Direct IQ Modulator with Integrated 90° Phase
Shifter*
Four Step RF Power Control
120MHz Modulation Bandwidth
Independent Double-Balanced Mixer
Modulation Accuracy Insensitive to Carrier Input
Power
Modulator I/Q Inputs Internally Biased
Available in 20-Lead FE Package
The LT
®
5503 is a front-end transmitter IC designed for low
voltage operation. The IC contains a high frequency quadra-
ture modulator with a variable gain amplifier (VGA) and a
balanced mixer. The modulator includes a precision 90°
phase shifter which allows direct modulation of an RF
signal by the baseband I and Q signals.
In a superheterodyne system, the mixer can be used to
generate the high-frequency RF input for the modulator by
mixing the system’s 1st and 2nd local oscillators.
The LT5503 modulator output P 1dB is –3dBm at 2.5GHz.
The VGA allows output power reduction in three steps up
to 13dB with digital control. The baseband inputs are
internally biased for maximum input voltage swing at low
supply voltage. If needed, they can be driven with external
bias voltages.
APPLICATIO S
IEEE 802.11 DSSS and FHSS
High Speed Wireless LAN (WLAN)
Wireless Local Loop (WLL)
PCS Wireless Data
MMDS
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. *Patent Pending
TYPICAL APPLICATIO
2.45GHz Transmitter Application, Carrier for Modulator Generated by Upmixer
2.45GHz
BPF
V
CC2
2V
V
CC1
2V
SSB OUTPUT POWER (dBm)
BQ
+
BQ
V
CC
LO2 V
CC
LO1
MIXER
ENABLE
MODULATOR
ENABLE
LO2IN
(750MHz)
MIXEN
MODEN
LO2
÷2
÷1
90°
MODOUT
VGA
MX
MX
+
MODIN V
CC
RF
V
CC
MOD
V
CC
VGA
LT5503
GND
DMODE
LO1
LO1IN (2075MHz)
CONTROL
LOGIC
GC1 GC2
5503 TA01
BI
+
BI
2.45GHz
MODULATED
RFOUT
U
SSB Output Power vs
I, Q Amplitude
0
5.25 VDC
–5
–10
–15
–20
–25
–30
–35
–40
–45
0.1
10
0.01
1
I, Q DIFFERENTIAL INPUT VOLTAGE (V
P-P
)
5503 G04
U
U
3 VDC
1.8 VDC
5503f
1

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