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LT5579 Datasheet(PDF) 13 Page - Linear Technology

Part # LT5579
Description  1.5GHz to 3.8GHz High Linearity Upconverting Mixer
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT5579 Datasheet(HTML) 13 Page - Linear Technology

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LT5579

5579fa
applicaTions inForMaTion
C9tosteptheimpedanceuptoabout12.5Ω.Atlower
frequenciesadditionalseriesinductancemayberequired
betweentheIFportsandC9.ThepositionofC9mayvary
withtheIFfrequencyduetothedifferentseriesinductance
requirements.The4:1impedanceratiooftransformerT1
completesthetransformationto50ohms.Table1liststhe
differentialIFinputimpedancesandreflectioncoefficients
forseveralfrequencies.
Table 1. IF Input Differential Impedance
FREQUENCY
(MHz)
IF INPUT
IMPEDANCE
REFLECTION COEFFICIENT
MAG
ANGLE
70
8.8+j1.3
0.70
177
140
8.7+j2.3
0.70
175
170
9.0+j2.8
0.70
174
190
8.9+j3.0
0.70
173
240
9.0+j4.0
0.70
170
380
9.7+j4.9
0.68
168
450
10.0+j5.2
0.67
167
750
10.8+j9.4
0.65
158
1000
11.8+j13.8
0.64
148
The purpose of capacitor C3 is to improve the LO-RF
leakageinsomeapplications.Thisrelativelysmall-valued
capacitorhaslittleeffectontheimpedancematchinmost
cases.Thiscapacitorshouldtypicallybelocatedcloseto
theIC,however,theremaybecaseswherere-positioning
thecapacitormayimproveperformance.
The measured return loss of the IF input is shown in
Figure3forapplicationfrequenciesof70MHz,240MHz
and456MHz.ComponentvaluesarelistedinTable2.(For
70MHzmatchingdetails,refertoFigure8.)
Table 2. IF Input Component Values
FREQUENCY
(MHz)
C1, C2
(pF)
C9
(pF)
C3
(pF)
L1, L2
(nH)
R1, R2
(Ω)
MATCH BW
(at 12dB RL)
70(3)
1000
120
(1)
100
9.1
<50to158
140
180
22
(1)
100
9.1
112to170
240
82
33
(1)
40
11
174to263
450
33
33
(1)
40
11
330to505
Note:(1)DependsonRF,(2)T1=M/A-ComMABAES0061,
(3)SeeFigure8
FREQUENCY (MHz)
0
–10
–5
0
300
500
800
5579 F03
–15
–20
–25
100 200
a
b
c
400
600 700
Figure 3. IF Input Return Loss with 70MHz (a),
240MHz (b) and 456MHz (c) Matching



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