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HMC1044LP3E Fiches technique(PDF) 12 Page - Hittite Microwave Corporation

No de pièce HMC1044LP3E
Description  PROGRAMMABLE HARMONIC LOW PASS FILTER
Download  16 Pages
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Fabricant  HITTITE [Hittite Microwave Corporation]
Site Internet  http://www.hittite.com
Logo HITTITE - Hittite Microwave Corporation

HMC1044LP3E Fiches technique(HTML) 12 Page - Hittite Microwave Corporation

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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com
Application Support: apps@hittite.com
HMC1044LP3E
v00.0312
PROGRAMMABLE HARMONIC LOW PASS FILTER
1 - 3 GHz 3 dB BANDWIDTH
-60
-50
-40
-30
-20
-10
0
500
1000
1500
2000
2500
3000
3rd LO Harmonic
2nd LO Harmonic
LO FUNDAMENTAL FREQUENCY (MHz)
Filtered
Unfiltered
Targeted Harmonic Levels
Figure 13. Maximum HMC1044LP3E attenuation of 3rd harmonic of the
LO[2]
0
2
4
6
8
10
12
14
16
500
1000
1500
2000
2500
3000
LO FREQUENCY (MHz)
Figure 14. HMC1044LP3E band selection corresponding to
Figure 13
Observing the results shown in Figure 13 in the context of targeted performance in Figure 12; It is apparent that the
HMC1044LP3E attenuates both the 3rd and the 2nd LO harmonics to well below the targeted maximum LO harmonic
level shown in Figure 12, ensuring that the targeted modulator sideband rejection performance is achieved.
Figure 15 shows the optimal 2nd harmonic attenuation achieved with the HMC1044LP3E, when the HMC830LP6GE
PLL with Integrated VCO is used as an LO to drive the HMC697LP4E quadrature modulator. The corresponding
HMC1044LP3E band selection is shown in Figure 16.
Figure 15. Maximum HMC1044LP3E attenuation of 2nd
harmonic of the LO [2]
-60
-50
-40
-30
-20
-10
0
500
1000
1500
2000
2500
3000
3rd LO Harmonic
2nd LO Harmonic
LO FUNDAMENTAL FREQUENCY (MHz)
Filtered
Unfiltered
Targeted Harmonic Levels
-5
0
5
10
15
20
500
1000
1500
2000
2500
3000
LO FREQUENCY (MHz)
Figure 16. HMC1044LP3E band selection corresponding to
Figure 15
Observing the results shown in Figure 15 in the context of the targeted performance in Figure 12; it is apparent that the
HMC1044LP3E attenuates both the 3rd and the 2nd LO harmonics to well below the targeted maximum LO harmonic
level shown in Figure 12, ensuring that the targeted modulator sideband rejection performance shown in Figure 12 is
achieved.
Using the relationship between sideband/image rejection vs. LO harmonic distortion in Figure 12 as a reference, it can
be observed that both approaches (maximizing 2nd harmonic attenuation in Figure 13, and maximizing 3rd harmonic
attenuation in Figure 14) achieve sideband/image rejection performance improvement, and effectively remove any
LO contribution to sideband/image rejection performance degradation. However, Figure 12 suggests that, when using
a 1xLO type modulator, more emphasis should be placed on attenuating the 3rd harmonic than the second because
the 2nd harmonic ceases to be a contributor at levels ~<-20 dBc, while the 3rd harmonic continues contributing to
sideband/image rejection, albeit at a smaller rate for the particular design characterized in Figure 12.
[2] Measured with HMC830LP6GE as an LO and HMC697LP4E modulator. The HMC830LP6GE was used in single-ended output configuration.


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