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HMC1044LP3E Fiches technique(PDF) 10 Page - Hittite Microwave Corporation

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

HMC1044LP3E Fiches technique(HTML) 10 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
HMC1044LP3E Application Information
The HMC1044LP3E is an ideal LO harmonic filter for wideband applications featuring quadrature modulators and/or
demodulators. The HMC1044LP3E’s 16 user programmable bands enable the user to optimally attenuate 2nd and/
or 3rd LO harmonics in order to maximize quadrature modulator/demodulator sideband/image rejection performance.
Typical diagrams with the HMC1044LP3E are shown in Figure 10 and Figure 11.
Figure 10. Typical HMC1044LP3E transmitter application
Figure 11. Typical HMC1044LP3E receiver application
Background, LO Harmonics and Modulator/Demodulator Sideband/Image Rejection
Most wideband quadrature modulators/demodulators in the market use some form of a filter to create the required
in-phase and quadrature LO components at the fundamental frequency of the LO (1xLO). Others, less common
modulators/demodulators accept LO input at 2xLO frequency and are not based upon filters. The 1xLO types are
particularly sensitive to LO 3rd harmonic levels, while the 2xLO types are more sensitive to 2nd harmonic levels.
Harmonics are normally present in all VCOs and especially in RFICs with integrated VCOs. High LO harmonic content
causes amplitude and phase mismatches, and ultimately performance degradation in modulator sideband rejection
and demodulator image rejection, as shown in Figure 12.


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