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HMC1044LP3E Fiches technique(PDF) 10 Page - Hittite Microwave Corporation |
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HMC1044LP3E Fiches technique(HTML) 10 Page - Hittite Microwave Corporation |
10 / 16 page 10 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. |
Numéro de pièce similaire - HMC1044LP3E |
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Description similaire - HMC1044LP3E |
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