LT5579
1.5GHz to 3.8GHz
High Linearity
Upconverting Mixer
FEATURES
DESCRIPTION
The LT®5579 mixer is a high performance upconverting
mixer optimized for frequencies in the 1.5GHz to 3.8GHz
range. The single-ended LO input and RF output ports
simplify board layout and reduce system cost. The mixer
needs only –1dBm of LO power and the balanced design
resultsinlowLOsignalleakagetotheRFoutput.At 2.6GHz
operation, the LT5579 provides high conversion gain of
1.3dB, high OIP3 of +26dBm and a low noise floor of
–157.5dBm/Hz at a –5dBm RF output signal level.
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High Output IP3: +27.3dBm at 2.14GHz
Low Noise Floor: –158dBm/Hz (P
n
= –5dBm)
OUT
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High Conversion Gain: 2.6dB at 2.14GHz
Wide Frequency Range: 1.5GHz to 3.8GHz*
Low LO Leakage
Single-Ended RF and LO
Low LO Drive Level: –1dBm
Single 3.3V Supply
5mm × 5mm QFN24 Package
The LT5579 offers a high performance alternative to pas-
sivemixers.Unlikepassivemixers,whichhaveconversion
loss and require high LO drive levels, the LT5579 delivers
conversion gain at significantly lower LO input levels and
is less sensitive to LO power level variations. The lower
LO drive level requirements, combined with the excellent
LO leakage performance, translate into lower LO signal
contamination of the output signal.
APPLICATIONS
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GSM/EDGE, W-CDMA, UMTS, LTE and TD-SCDMA
Basestations
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2.6GHz and 3.5GHz WiMAX Basestations
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2.4GHz ISM Band Transmitters
High Performance Transmitters
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L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Operation over wider frequency range is possible with reduced performance.
Consult Linear Technology for information and assistance.
TYPICAL APPLICATION
Frequency Upconversion in 2.14GHz W-CDMA Transmitter
LO INPUT
–1dBm (TYP)
Gain, NF and OIP3 vs
RF Output Frequency
LO
30
LT5579
OIP3
25
T
= 25°C
= 3.3V
= 240MHz
= f + f
A
CC
V
GND
20
15
f
f
IF
BIAS
11Ω
LO RF IF
SSB NF
GAIN
IF
INPUT
RF
OUTPUT
40nH
MABAES0061
4:1
10
5
82pF
82pF
1.8nH
+
–
IF
1
5
RF
0.45pF
2
3
33pF
4
IF
0
1900 2000
2100
2200
2300
2400
40nH
11Ω
RF FREQUENCY (MHz)
V
CC
5579 TA01a
5579 TA01b
V
CC
3.3V
1μF
100pF
1nF
5579f
1