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HMC1044LP3E Fiches technique(PDF) 11 Page - Hittite Microwave Corporation |
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HMC1044LP3E Fiches technique(HTML) 11 Page - Hittite Microwave Corporation |
11 / 16 page 11 HMC1044LP3E v00.0312 PROGRAMMABLE HARMONIC LOW PASS FILTER 1 - 3 GHz 3 dB BANDWIDTH 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 Figure 12. -80 -70 -60 -50 -40 -30 -20 -10 0 -80 -70 -60 -50 -40 -30 -20 -10 0 hmc701 Sweeper Plot 11:18:12 AM 3/19/2012 LO HARMONIC LEVEL (dBc) 3rd LO Harmonic 2nd LO Harmonic Targeted minimum LO harmonic level Targeted maximum modulator sideband rejection Typical impact of 2nd and 3rd LO harmonic on modulator sideband rejection.[1] Figure 12 shows a typical modulator with 1xLO input, where both the 2nd and 3rd LO harmonics affect the modulator sideband rejection performance at levels > -20 dBc relative to the LO signal power. It also shows that the 3rd LO harmonic has greater impact on modulator sideband rejection performance than the 2nd, and that there is little effect of the 2nd LO harmonic on modulator sideband rejection once the 2nd LO harmonic is below -20 dBc levels, relative to the LO signal level. The HMC1044LP3E is designed to ensure that the 2nd and the 3rd LO harmonics are below -20 dBc relative to the LO signal level across the entire operating range of Hittite’s wideband PLLs with integrated VCOs. Thereby ensuring little or no LO contribution is added to modulator/demodulator sideband/image rejection performance degradation. Using the HMC1044LP3E Modulator/demodulator sideband/image rejection performance is specific to each individual modulator/demodulator, and depends on a number of other variables including: type (1xLO or 2xLO input), balance (amplitude and phase matching), signal path matching and interface to other components, board layout, input signal bandwidth, and LO harmonics. Figure 12 shows that typically the LO harmonics stop being a dominant contributor to modulator/demodulator sideband/image rejection performance degradation once they are below approximately -20 dBc relative to the LO signal level. However, the exact level at which harmonics cease being the dominant contributor to sideband/image rejection performance depends on each individual modulator/demodulator and each individual design. Hence, the optimal band selection of the HMC1044LP3E may be different for different designs. Figure 13 shows optimal 3rd harmonic attenuation achieved with the HMC1044LP3E without optimizing the 2nd harmonic, when the HMC830LP6GE PLL with Integrated VCO is used as an LO to drive the HMC697LP4E quadrature modulator. The corresponding HMC1044LP3E band selections are shown in Figure 14. [1] Measured with HMC697LP4E direct modulator at 2 GHz, with LO input power = 0 dBm, 1xLO type. |
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