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HMC1044LP3E Fiches technique(PDF) 12 Page - Hittite Microwave Corporation |
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HMC1044LP3E Fiches technique(HTML) 12 Page - Hittite Microwave Corporation |
12 / 16 page 12 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. |
Numéro de pièce similaire - HMC1044LP3E |
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Description similaire - HMC1044LP3E |
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